[Lldb-commits] [lldb] f63155a - [clang] Show line numbers in diagnostic code snippets

Timm Bäder via lldb-commits lldb-commits at lists.llvm.org
Tue May 30 22:38:37 PDT 2023


Author: Timm Bäder
Date: 2023-05-31T07:26:03+02:00
New Revision: f63155aaa6467bd2610820dfd1996af3bb6029a7

URL: https://github.com/llvm/llvm-project/commit/f63155aaa6467bd2610820dfd1996af3bb6029a7
DIFF: https://github.com/llvm/llvm-project/commit/f63155aaa6467bd2610820dfd1996af3bb6029a7.diff

LOG: [clang] Show line numbers in diagnostic code snippets

Show line numbers to the left of diagnostic code snippets and increase
the numbers of lines shown from 1 to 16.

Differential Revision: https://reviews.llvm.org/D147875

Added: 
    

Modified: 
    clang-tools-extra/test/clang-tidy/checkers/cert/uppercase-literal-suffix-integer.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-float16.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point-opencl-half.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-hexadecimal-floating-point.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-custom-list.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-ms.cpp
    clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer.cpp
    clang/docs/ReleaseNotes.rst
    clang/docs/UsersManual.rst
    clang/include/clang/Basic/DiagnosticOptions.def
    clang/include/clang/Basic/DiagnosticOptions.h
    clang/include/clang/Driver/Options.td
    clang/include/clang/Frontend/TextDiagnostic.h
    clang/lib/Driver/ToolChains/Clang.cpp
    clang/lib/Frontend/TextDiagnostic.cpp
    clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
    clang/test/FixIt/fixit-function-call.cpp
    clang/test/FixIt/fixit-newline-style.c
    clang/test/FixIt/fixit-unicode-with-utf8-output.c
    clang/test/FixIt/fixit-unicode.c
    clang/test/Frontend/source-col-map.c
    clang/test/Lexer/header.cpp
    clang/test/Lexer/string-literal-errors.cpp
    clang/test/Misc/caret-diags-macros.c
    clang/test/Misc/caret-diags-multiline.cpp
    clang/test/Misc/diag-macro-backtrace.c
    clang/test/Misc/message-length.c
    clang/test/Misc/tabstop.c
    clang/test/Misc/unnecessary-elipses.cpp
    clang/test/Misc/unprintable.c
    clang/test/Misc/wrong-encoding.c
    clang/test/Parser/brackets.c
    clang/test/Parser/brackets.cpp
    clang/test/Preprocessor/ucn-pp-identifier.c
    clang/test/Sema/caret-diags-complex-init.cpp
    clang/test/SemaCXX/struct-class-redecl.cpp
    lldb/test/API/commands/expression/diagnostics/TestExprDiagnostics.py

Removed: 
    


################################################################################
diff  --git a/clang-tools-extra/test/clang-tidy/checkers/cert/uppercase-literal-suffix-integer.cpp b/clang-tools-extra/test/clang-tidy/checkers/cert/uppercase-literal-suffix-integer.cpp
index 0dc06df4f18b4..6fa700bf06d4f 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/cert/uppercase-literal-suffix-integer.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/cert/uppercase-literal-suffix-integer.cpp
@@ -31,7 +31,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'l', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1l;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}L{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}L{{$}}
   // CHECK-FIXES: static constexpr auto v5 = 1L;
   static_assert(is_same<decltype(v5), const long>::value, "");
   static_assert(v5 == 1, "");
@@ -46,7 +46,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'll', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v7 = 1ll;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LL{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LL{{$}}
   // CHECK-FIXES: static constexpr auto v7 = 1LL;
   static_assert(is_same<decltype(v7), const long long>::value, "");
   static_assert(v7 == 1, "");
@@ -79,7 +79,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'lu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v13 = 1lu;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LU{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LU{{$}}
   // CHECK-FIXES: static constexpr auto v13 = 1LU;
   static_assert(is_same<decltype(v13), const unsigned long>::value, "");
   static_assert(v13 == 1, "");
@@ -88,7 +88,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'Lu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v14 = 1Lu;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LU{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LU{{$}}
   // CHECK-FIXES: static constexpr auto v14 = 1LU;
   static_assert(is_same<decltype(v14), const unsigned long>::value, "");
   static_assert(v14 == 1, "");
@@ -97,7 +97,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'lU', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v15 = 1lU;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LU{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LU{{$}}
   // CHECK-FIXES: static constexpr auto v15 = 1LU;
   static_assert(is_same<decltype(v15), const unsigned long>::value, "");
   static_assert(v15 == 1, "");
@@ -130,7 +130,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'llu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v21 = 1llu;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LLU{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LLU{{$}}
   // CHECK-FIXES: static constexpr auto v21 = 1LLU;
   static_assert(is_same<decltype(v21), const unsigned long long>::value, "");
   static_assert(v21 == 1, "");
@@ -139,7 +139,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'LLu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v22 = 1LLu;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LLU{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LLU{{$}}
   // CHECK-FIXES: static constexpr auto v22 = 1LLU;
   static_assert(is_same<decltype(v22), const unsigned long long>::value, "");
   static_assert(v22 == 1, "");
@@ -148,7 +148,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'llU', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v23 = 1llU;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LLU{{$}}
+  // CHECK-MESSAGES-NEXT: {{^ *| *}}LLU{{$}}
   // CHECK-FIXES: static constexpr auto v23 = 1LLU;
   static_assert(is_same<decltype(v23), const unsigned long long>::value, "");
   static_assert(v23 == 1, "");

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-float16.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-float16.cpp
index a790597fcff51..46d7bc1347d0d 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-float16.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-float16.cpp
@@ -9,7 +9,7 @@ void float16_normal_literals() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'f16', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v14 = 1.f16;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F16{{$}}
+  // CHECK-MESSAGES-NEXT: F16{{$}}
   // CHECK-FIXES: static constexpr auto v14 = 1.F16;
   static_assert(is_same<decltype(v14), const _Float16>::value, "");
   static_assert(v14 == 1.F16, "");
@@ -18,7 +18,7 @@ void float16_normal_literals() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'f16', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v15 = 1.e0f16;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F16{{$}}
+  // CHECK-MESSAGES-NEXT: F16{{$}}
   // CHECK-FIXES: static constexpr auto v15 = 1.e0F16;
   static_assert(is_same<decltype(v15), const _Float16>::value, "");
   static_assert(v15 == 1.F16, "");
@@ -39,7 +39,7 @@ void float16_hexadecimal_literals() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'f16', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v13 = 0xfp0f16;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F16{{$}}
+  // CHECK-MESSAGES-NEXT: F16{{$}}
   // CHECK-FIXES: static constexpr auto v13 = 0xfp0F16;
   static_assert(is_same<decltype(v13), const _Float16>::value, "");
   static_assert(v13 == 0xfp0F16, "");

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point-opencl-half.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point-opencl-half.cpp
index 8cea2a4d827cb..ef905da6e9f95 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point-opencl-half.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point-opencl-half.cpp
@@ -14,14 +14,14 @@ void floating_point_half_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:20: warning: floating point literal has suffix 'h', which is not uppercase
   // CHECK-MESSAGES-NEXT: static half v2 = 1.h;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}H{{$}}
+  // CHECK-MESSAGES-NEXT: H{{$}}
   // CHECK-HIXES: static half v2 = 1.H;
 
   static half v3 = 1.e0h;
   // CHECK-MESSAGES: :[[@LINE-1]]:20: warning: floating point literal has suffix 'h', which is not uppercase
   // CHECK-MESSAGES-NEXT: static half v3 = 1.e0h;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}H{{$}}
+  // CHECK-MESSAGES-NEXT: H{{$}}
   // CHECK-HIXES: static half v3 = 1.e0H;
 
   static half v4 = 1.H; // OK.

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point.cpp
index a0dcc38c8b231..d9f5bfbe3aa38 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-floating-point.cpp
@@ -20,7 +20,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v2 = 1.f;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto v2 = 1.F;
   static_assert(is_same<decltype(v2), const float>::value, "");
   static_assert(v2 == 1.0F, "");
@@ -29,7 +29,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v3 = 1.e0f;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto v3 = 1.e0F;
   static_assert(is_same<decltype(v3), const float>::value, "");
   static_assert(v3 == 1.0F, "");
@@ -48,7 +48,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'l', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v6 = 1.l;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}L{{$}}
+  // CHECK-MESSAGES-NEXT: L{{$}}
   // CHECK-FIXES: static constexpr auto v6 = 1.L;
   static_assert(is_same<decltype(v6), const long double>::value, "");
   static_assert(v6 == 1., "");
@@ -57,7 +57,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'l', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v7 = 1.e0l;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}L{{$}}
+  // CHECK-MESSAGES-NEXT: L{{$}}
   // CHECK-FIXES: static constexpr auto v7 = 1.e0L;
   static_assert(is_same<decltype(v7), const long double>::value, "");
   static_assert(v7 == 1., "");
@@ -76,7 +76,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'q', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v10 = 1.q;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}Q{{$}}
+  // CHECK-MESSAGES-NEXT: Q{{$}}
   // CHECK-FIXES: static constexpr auto v10 = 1.Q;
   static_assert(is_same<decltype(v10), const __float128>::value, "");
   static_assert(v10 == 1., "");
@@ -85,7 +85,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'q', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v11 = 1.e0q;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}Q{{$}}
+  // CHECK-MESSAGES-NEXT: Q{{$}}
   // CHECK-FIXES: static constexpr auto v11 = 1.e0Q;
   static_assert(is_same<decltype(v11), const __float128>::value, "");
   static_assert(v11 == 1., "");
@@ -106,7 +106,7 @@ void floating_point_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'i', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v14 = 1.i;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I{{$}}
+  // CHECK-MESSAGES-NEXT: I{{$}}
   // CHECK-FIXES: static constexpr auto v14 = 1.I;
   static_assert(is_same<decltype(v14), const _Complex double>::value, "");
   static_assert(v14 == 1.I, "");
@@ -115,7 +115,7 @@ void floating_point_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'i', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v15 = 1.e0i;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I{{$}}
+  // CHECK-MESSAGES-NEXT: I{{$}}
   // CHECK-FIXES: static constexpr auto v15 = 1.e0I;
   static_assert(is_same<decltype(v15), const _Complex double>::value, "");
   static_assert(v15 == 1.I, "");
@@ -134,7 +134,7 @@ void floating_point_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'j', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v18 = 1.j;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}J{{$}}
+  // CHECK-MESSAGES-NEXT: J{{$}}
   // CHECK-FIXES: static constexpr auto v18 = 1.J;
   static_assert(is_same<decltype(v18), const _Complex double>::value, "");
   static_assert(v18 == 1.J, "");
@@ -143,7 +143,7 @@ void floating_point_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'j', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v19 = 1.e0j;
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}J{{$}}
+  // CHECK-MESSAGES-NEXT: J{{$}}
   // CHECK-FIXES: static constexpr auto v19 = 1.e0J;
   static_assert(is_same<decltype(v19), const _Complex double>::value, "");
   static_assert(v19 == 1.J, "");
@@ -163,7 +163,7 @@ void macros() {
   // CHECK-MESSAGES: :[[@LINE-1]]:42: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto m0 = PASSTHROUGH(1.f);
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto m0 = PASSTHROUGH(1.F);
   static_assert(is_same<decltype(m0), const float>::value, "");
   static_assert(m0 == 1.0F, "");

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-hexadecimal-floating-point.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-hexadecimal-floating-point.cpp
index 57d24fb5712c4..72077153fb718 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-hexadecimal-floating-point.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-hexadecimal-floating-point.cpp
@@ -16,7 +16,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v1 = 0xfp0f;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto v1 = 0xfp0F;
   static_assert(is_same<decltype(v1), const float>::value, "");
   static_assert(v1 == 15, "");
@@ -29,7 +29,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v3 = 0xfP0f;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto v3 = 0xfP0F;
   static_assert(is_same<decltype(v3), const float>::value, "");
   static_assert(v3 == 15, "");
@@ -42,7 +42,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 0xFP0f;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto v5 = 0xFP0F;
   static_assert(is_same<decltype(v5), const float>::value, "");
   static_assert(v5 == 15, "");
@@ -55,7 +55,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v7 = 0xFp0f;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto v7 = 0xFp0F;
   static_assert(is_same<decltype(v7), const float>::value, "");
   static_assert(v7 == 15, "");
@@ -70,7 +70,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: floating point literal has suffix 'l', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v9 = 0xfp0l;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}L{{$}}
+  // CHECK-MESSAGES-NEXT: L{{$}}
   // CHECK-FIXES: static constexpr auto v9 = 0xfp0L;
   static_assert(is_same<decltype(v9), const long double>::value, "");
   static_assert(v9 == 0xfp0, "");
@@ -85,7 +85,7 @@ void floating_point_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'q', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v11 = 0xfp0q;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}Q{{$}}
+  // CHECK-MESSAGES-NEXT: Q{{$}}
   // CHECK-FIXES: static constexpr auto v11 = 0xfp0Q;
   static_assert(is_same<decltype(v11), const __float128>::value, "");
   static_assert(v11 == 0xfp0, "");
@@ -102,7 +102,7 @@ void floating_point_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'i', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v14 = 0xfp0i;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I{{$}}
+  // CHECK-MESSAGES-NEXT: I{{$}}
   // CHECK-FIXES: static constexpr auto v14 = 0xfp0I;
   static_assert(is_same<decltype(v14), const _Complex double>::value, "");
   static_assert(v14 == 0xfp0I, "");
@@ -117,7 +117,7 @@ void floating_point_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: floating point literal has suffix 'j', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v18 = 0xfp0j;
   // CHECK-MESSAGES-NEXT: ^    ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}J{{$}}
+  // CHECK-MESSAGES-NEXT: J{{$}}
   // CHECK-FIXES: static constexpr auto v18 = 0xfp0J;
   static_assert(is_same<decltype(v18), const _Complex double>::value, "");
   static_assert(v18 == 0xfp0J, "");
@@ -133,7 +133,7 @@ void macros() {
   // CHECK-MESSAGES: :[[@LINE-1]]:42: warning: floating point literal has suffix 'f', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto m0 = PASSTHROUGH(0x0p0f);
   // CHECK-MESSAGES-NEXT: ^ ~
-  // CHECK-MESSAGES-NEXT: {{^ *}}F{{$}}
+  // CHECK-MESSAGES-NEXT: F{{$}}
   // CHECK-FIXES: static constexpr auto m0 = PASSTHROUGH(0x0p0F);
   static_assert(is_same<decltype(m0), const float>::value, "");
   static_assert(m0 == 0x0p0F, "");

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-custom-list.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-custom-list.cpp
index c787cab1fc4a7..5ee09527999eb 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-custom-list.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-custom-list.cpp
@@ -22,7 +22,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'l', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1l;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}L{{$}}
+  // CHECK-MESSAGES-NEXT: L{{$}}
   // CHECK-FIXES: static constexpr auto v5 = 1L;
   static_assert(is_same<decltype(v5), const long>::value, "");
   static_assert(v5 == 1, "");
@@ -47,7 +47,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'ul', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1ul;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}uL{{$}}
+  // CHECK-MESSAGES-NEXT: uL{{$}}
   // CHECK-FIXES: static constexpr auto v9 = 1uL;
   static_assert(is_same<decltype(v9), const unsigned long>::value, "");
   static_assert(v9 == 1, "");
@@ -60,7 +60,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'Ul', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v11 = 1Ul;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}uL{{$}}
+  // CHECK-MESSAGES-NEXT: uL{{$}}
   // CHECK-FIXES: static constexpr auto v11 = 1uL;
   static_assert(is_same<decltype(v11), const unsigned long>::value, "");
   static_assert(v11 == 1, "");
@@ -69,7 +69,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'UL', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v12 = 1UL;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}uL{{$}}
+  // CHECK-MESSAGES-NEXT: uL{{$}}
   // CHECK-FIXES: static constexpr auto v12 = 1uL;
   static_assert(is_same<decltype(v12), const unsigned long>::value, "");
   static_assert(v12 == 1, "");

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-ms.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-ms.cpp
index fe3269f2c506d..7ac4a7502e7b7 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-ms.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer-ms.cpp
@@ -21,7 +21,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'i32', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v3 = 1i32;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I32{{$}}
+  // CHECK-MESSAGES-NEXT: I32{{$}}
   // CHECK-FIXES: static constexpr auto v3 = 1I32;
   static_assert(is_same<decltype(v3), const int>::value, "");
   static_assert(v3 == 1I32, "");
@@ -36,7 +36,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'i64', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1i64;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I64{{$}}
+  // CHECK-MESSAGES-NEXT: I64{{$}}
   // CHECK-FIXES: static constexpr auto v5 = 1I64;
   static_assert(is_same<decltype(v5), const long int>::value, "");
   static_assert(v5 == 1I64, "");
@@ -51,7 +51,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'i16', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v7 = 1i16;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I16{{$}}
+  // CHECK-MESSAGES-NEXT: I16{{$}}
   // CHECK-FIXES: static constexpr auto v7 = 1I16;
   static_assert(is_same<decltype(v7), const short>::value, "");
   static_assert(v7 == 1I16, "");
@@ -66,7 +66,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'i8', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1i8;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I8{{$}}
+  // CHECK-MESSAGES-NEXT: I8{{$}}
   // CHECK-FIXES: static constexpr auto v9 = 1I8;
   static_assert(is_same<decltype(v9), const char>::value, "");
   static_assert(v9 == 1I8, "");

diff  --git a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer.cpp
index c03ccc23992fc..084d9f68e0b5e 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability/uppercase-literal-suffix-integer.cpp
@@ -21,7 +21,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'u', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v3 = 1u;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}U{{$}}
+  // CHECK-MESSAGES-NEXT: U{{$}}
   // CHECK-FIXES: static constexpr auto v3 = 1U;
   static_assert(is_same<decltype(v3), const unsigned int>::value, "");
   static_assert(v3 == 1, "");
@@ -36,7 +36,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'l', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v5 = 1l;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}L{{$}}
+  // CHECK-MESSAGES-NEXT: L{{$}}
   // CHECK-FIXES: static constexpr auto v5 = 1L;
   static_assert(is_same<decltype(v5), const long>::value, "");
   static_assert(v5 == 1, "");
@@ -51,7 +51,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'll', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v7 = 1ll;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LL{{$}}
+  // CHECK-MESSAGES-NEXT: LL{{$}}
   // CHECK-FIXES: static constexpr auto v7 = 1LL;
   static_assert(is_same<decltype(v7), const long long>::value, "");
   static_assert(v7 == 1, "");
@@ -66,7 +66,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:30: warning: integer literal has suffix 'ul', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v9 = 1ul;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}UL{{$}}
+  // CHECK-MESSAGES-NEXT: UL{{$}}
   // CHECK-FIXES: static constexpr auto v9 = 1UL;
   static_assert(is_same<decltype(v9), const unsigned long>::value, "");
   static_assert(v9 == 1, "");
@@ -75,7 +75,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'uL', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v10 = 1uL;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}UL{{$}}
+  // CHECK-MESSAGES-NEXT: UL{{$}}
   // CHECK-FIXES: static constexpr auto v10 = 1UL;
   static_assert(is_same<decltype(v10), const unsigned long>::value, "");
   static_assert(v10 == 1, "");
@@ -84,7 +84,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'Ul', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v11 = 1Ul;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}UL{{$}}
+  // CHECK-MESSAGES-NEXT: UL{{$}}
   // CHECK-FIXES: static constexpr auto v11 = 1UL;
   static_assert(is_same<decltype(v11), const unsigned long>::value, "");
   static_assert(v11 == 1, "");
@@ -99,7 +99,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'lu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v13 = 1lu;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LU{{$}}
+  // CHECK-MESSAGES-NEXT: LU{{$}}
   // CHECK-FIXES: static constexpr auto v13 = 1LU;
   static_assert(is_same<decltype(v13), const unsigned long>::value, "");
   static_assert(v13 == 1, "");
@@ -108,7 +108,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'Lu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v14 = 1Lu;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LU{{$}}
+  // CHECK-MESSAGES-NEXT: LU{{$}}
   // CHECK-FIXES: static constexpr auto v14 = 1LU;
   static_assert(is_same<decltype(v14), const unsigned long>::value, "");
   static_assert(v14 == 1, "");
@@ -117,7 +117,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'lU', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v15 = 1lU;
   // CHECK-MESSAGES-NEXT: ^~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LU{{$}}
+  // CHECK-MESSAGES-NEXT: LU{{$}}
   // CHECK-FIXES: static constexpr auto v15 = 1LU;
   static_assert(is_same<decltype(v15), const unsigned long>::value, "");
   static_assert(v15 == 1, "");
@@ -132,7 +132,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'ull', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v17 = 1ull;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}ULL{{$}}
+  // CHECK-MESSAGES-NEXT: ULL{{$}}
   // CHECK-FIXES: static constexpr auto v17 = 1ULL;
   static_assert(is_same<decltype(v17), const unsigned long long>::value, "");
   static_assert(v17 == 1, "");
@@ -141,7 +141,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'uLL', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v18 = 1uLL;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}ULL{{$}}
+  // CHECK-MESSAGES-NEXT: ULL{{$}}
   // CHECK-FIXES: static constexpr auto v18 = 1ULL;
   static_assert(is_same<decltype(v18), const unsigned long long>::value, "");
   static_assert(v18 == 1, "");
@@ -150,7 +150,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'Ull', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v19 = 1Ull;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}ULL{{$}}
+  // CHECK-MESSAGES-NEXT: ULL{{$}}
   // CHECK-FIXES: static constexpr auto v19 = 1ULL;
   static_assert(is_same<decltype(v19), const unsigned long long>::value, "");
   static_assert(v19 == 1, "");
@@ -165,7 +165,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'llu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v21 = 1llu;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LLU{{$}}
+  // CHECK-MESSAGES-NEXT: LLU{{$}}
   // CHECK-FIXES: static constexpr auto v21 = 1LLU;
   static_assert(is_same<decltype(v21), const unsigned long long>::value, "");
   static_assert(v21 == 1, "");
@@ -174,7 +174,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'LLu', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v22 = 1LLu;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LLU{{$}}
+  // CHECK-MESSAGES-NEXT: LLU{{$}}
   // CHECK-FIXES: static constexpr auto v22 = 1LLU;
   static_assert(is_same<decltype(v22), const unsigned long long>::value, "");
   static_assert(v22 == 1, "");
@@ -183,7 +183,7 @@ void integer_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'llU', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v23 = 1llU;
   // CHECK-MESSAGES-NEXT: ^~~~
-  // CHECK-MESSAGES-NEXT: {{^ *}}LLU{{$}}
+  // CHECK-MESSAGES-NEXT: LLU{{$}}
   // CHECK-FIXES: static constexpr auto v23 = 1LLU;
   static_assert(is_same<decltype(v23), const unsigned long long>::value, "");
   static_assert(v23 == 1, "");
@@ -200,7 +200,7 @@ void integer_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'i', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v25 = 1i;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}I{{$}}
+  // CHECK-MESSAGES-NEXT: I{{$}}
   // CHECK-FIXES: static constexpr auto v25 = 1I;
   static_assert(is_same<decltype(v25), const _Complex int>::value, "");
   static_assert(v25 == 1I, "");
@@ -215,7 +215,7 @@ void integer_complex_suffix() {
   // CHECK-MESSAGES: :[[@LINE-1]]:31: warning: integer literal has suffix 'j', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto v27 = 1j;
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}J{{$}}
+  // CHECK-MESSAGES-NEXT: J{{$}}
   // CHECK-FIXES: static constexpr auto v27 = 1J;
   static_assert(is_same<decltype(v27), const _Complex int>::value, "");
   static_assert(v27 == 1J, "");
@@ -231,7 +231,7 @@ void macros() {
   // CHECK-MESSAGES: :[[@LINE-1]]:42: warning: integer literal has suffix 'u', which is not uppercase
   // CHECK-MESSAGES-NEXT: static constexpr auto m0 = PASSTHROUGH(1u);
   // CHECK-MESSAGES-NEXT: ^~
-  // CHECK-MESSAGES-NEXT: {{^ *}}U{{$}}
+  // CHECK-MESSAGES-NEXT: U{{$}}
   // CHECK-FIXES: static constexpr auto m0 = PASSTHROUGH(1U);
   static_assert(is_same<decltype(m0), const unsigned int>::value, "");
   static_assert(m0 == 1, "");

diff  --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 8a9dd04cda5bb..b5814350a5f11 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -314,6 +314,11 @@ Improvements to Clang's diagnostics
   is an incomplete type.
   (`#55175: <https://github.com/llvm/llvm-project/issues/55175>`_, and fixes an
   incorrect mention of ``alignof`` in a diagnostic about ``alignas``).
+- Clang will now show a margin with line numbers to the left of each line
+  of code it prints for diagnostics. This can be disabled using
+  ``-fno-diagnostics-show-line-numbers``. At the same time, the maximum
+  number of code lines it prints has been increased from 1 to 16. This
+  can be controlled using ``-fcaret-diagnostics-max-lines=``.
 
 Bug Fixes in This Version
 -------------------------

diff  --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst
index cee037a7ea89d..6b597242e3f93 100644
--- a/clang/docs/UsersManual.rst
+++ b/clang/docs/UsersManual.rst
@@ -575,6 +575,38 @@ output format of the diagnostics that it generates.
                [...]>>>
 
 
+.. option:: -fcaret-diagnostics-max-lines:
+
+   Controls how many lines of code clang prints for diagnostics. By default,
+   clang prints a maximum of 16 lines of code.
+
+
+.. option:: -fdiagnostics-show-line-numbers:
+
+   Controls whether clang will print a margin containing the line number on
+   the left of each line of code it prints for diagnostics.
+
+   Default:
+
+    ::
+
+      test.cpp:5:1: error: 'main' must return 'int'
+          5 | void main() {}
+            | ^~~~
+            | int
+
+
+   With -fno-diagnostics-show-line-numbers:
+
+    ::
+
+      test.cpp:5:1: error: 'main' must return 'int'
+      void main() {}
+      ^~~~
+      int
+
+
+
 .. _cl_diag_warning_groups:
 
 Individual Warning Groups

diff  --git a/clang/include/clang/Basic/DiagnosticOptions.def b/clang/include/clang/Basic/DiagnosticOptions.def
index 1d6d55a411e78..6d0c1b14acc12 100644
--- a/clang/include/clang/Basic/DiagnosticOptions.def
+++ b/clang/include/clang/Basic/DiagnosticOptions.def
@@ -90,6 +90,8 @@ VALUE_DIAGOPT(ConstexprBacktraceLimit, 32, DefaultConstexprBacktraceLimit)
 VALUE_DIAGOPT(SpellCheckingLimit, 32, DefaultSpellCheckingLimit)
 /// Limit number of lines shown in a snippet.
 VALUE_DIAGOPT(SnippetLineLimit, 32, DefaultSnippetLineLimit)
+/// Show line number column on the left of snippets.
+VALUE_DIAGOPT(ShowLineNumbers, 1, DefaultShowLineNumbers)
 
 VALUE_DIAGOPT(TabStop, 32, DefaultTabStop) /// The distance between tab stops.
 /// Column limit for formatting message diagnostics, or 0 if unused.

diff  --git a/clang/include/clang/Basic/DiagnosticOptions.h b/clang/include/clang/Basic/DiagnosticOptions.h
index 4b0d45a3ff7c7..7e218b9c71e69 100644
--- a/clang/include/clang/Basic/DiagnosticOptions.h
+++ b/clang/include/clang/Basic/DiagnosticOptions.h
@@ -84,7 +84,8 @@ class DiagnosticOptions : public RefCountedBase<DiagnosticOptions>{
     DefaultTemplateBacktraceLimit = 10,
     DefaultConstexprBacktraceLimit = 10,
     DefaultSpellCheckingLimit = 50,
-    DefaultSnippetLineLimit = 1,
+    DefaultSnippetLineLimit = 16,
+    DefaultShowLineNumbers = 1,
   };
 
   // Define simple diagnostic options (with no accessors).

diff  --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index f6240f86447cb..41bd1c00eb229 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -2566,6 +2566,10 @@ defm operator_names : BoolFOption<"operator-names",
 def fdiagnostics_absolute_paths : Flag<["-"], "fdiagnostics-absolute-paths">, Group<f_Group>,
   Flags<[CC1Option, CoreOption]>, HelpText<"Print absolute paths in diagnostics">,
   MarshallingInfoFlag<DiagnosticOpts<"AbsolutePath">>;
+defm diagnostics_show_line_numbers : BoolFOption<"diagnostics-show-line-numbers",
+  DiagnosticOpts<"ShowLineNumbers">, DefaultTrue,
+  NegFlag<SetFalse, [CC1Option], "Show line numbers in diagnostic code snippets">,
+  PosFlag<SetTrue>>;
 def fno_stack_protector : Flag<["-"], "fno-stack-protector">, Group<f_Group>,
   HelpText<"Disable the use of stack protectors">;
 def fno_strict_aliasing : Flag<["-"], "fno-strict-aliasing">, Group<f_Group>,

diff  --git a/clang/include/clang/Frontend/TextDiagnostic.h b/clang/include/clang/Frontend/TextDiagnostic.h
index a2eec46beccd1..7eb0ab0cdc9bc 100644
--- a/clang/include/clang/Frontend/TextDiagnostic.h
+++ b/clang/include/clang/Frontend/TextDiagnostic.h
@@ -103,7 +103,8 @@ class TextDiagnostic : public DiagnosticRenderer {
                            SmallVectorImpl<CharSourceRange> &Ranges,
                            ArrayRef<FixItHint> Hints);
 
-  void emitSnippet(StringRef SourceLine);
+  void emitSnippet(StringRef SourceLine, unsigned MaxLineNoDisplayWidth,
+                   unsigned LineNo);
 
   void emitParseableFixits(ArrayRef<FixItHint> Hints, const SourceManager &SM);
 };

diff  --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index d5e8718641754..e22c2ce7f2ede 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4111,6 +4111,9 @@ static void RenderDiagnosticsOptions(const Driver &D, const ArgList &Args,
   Args.addOptOutFlag(CmdArgs, options::OPT_fshow_source_location,
                      options::OPT_fno_show_source_location);
 
+  Args.addOptOutFlag(CmdArgs, options::OPT_fdiagnostics_show_line_numbers,
+                     options::OPT_fno_diagnostics_show_line_numbers);
+
   if (Args.hasArg(options::OPT_fdiagnostics_absolute_paths))
     CmdArgs.push_back("-fdiagnostics-absolute-paths");
 

diff  --git a/clang/lib/Frontend/TextDiagnostic.cpp b/clang/lib/Frontend/TextDiagnostic.cpp
index 08f84d28bb852..baf9b017fc83e 100644
--- a/clang/lib/Frontend/TextDiagnostic.cpp
+++ b/clang/lib/Frontend/TextDiagnostic.cpp
@@ -471,9 +471,7 @@ static void selectInterestingSourceRegion(std::string &SourceLine,
   CaretEnd = map.byteToColumn(SourceEnd) + CaretColumnsOutsideSource;
 
   // [CaretStart, CaretEnd) is the slice we want. Update the various
-  // output lines to show only this slice, with two-space padding
-  // before the lines so that it looks nicer.
-
+  // output lines to show only this slice.
   assert(CaretStart!=(unsigned)-1 && CaretEnd!=(unsigned)-1 &&
          SourceStart!=(unsigned)-1 && SourceEnd!=(unsigned)-1);
   assert(SourceStart <= SourceEnd);
@@ -1120,6 +1118,14 @@ static std::string buildFixItInsertionLine(FileID FID,
   return FixItInsertionLine;
 }
 
+static unsigned getNumDisplayWidth(unsigned N) {
+  unsigned L = 1u, M = 10u;
+  while (M <= N && ++L != std::numeric_limits<unsigned>::digits10 + 1)
+    M *= 10u;
+
+  return L;
+}
+
 /// Emit a code snippet and caret line.
 ///
 /// This routine emits a single line's code snippet and caret line..
@@ -1172,7 +1178,26 @@ void TextDiagnostic::emitSnippetAndCaret(
       Lines = maybeAddRange(Lines, *OptionalRange, MaxLines);
   }
 
-  for (unsigned LineNo = Lines.first; LineNo != Lines.second + 1; ++LineNo) {
+  // Our line numbers look like:
+  // " [number] | "
+  // Where [number] is MaxLineNoDisplayWidth columns
+  // and the full thing is therefore MaxLineNoDisplayWidth + 4 columns.
+  unsigned DisplayLineNo = Loc.getPresumedLoc().getLine();
+  unsigned MaxLineNoDisplayWidth =
+      DiagOpts->ShowLineNumbers
+          ? std::max(4u, getNumDisplayWidth(DisplayLineNo + MaxLines))
+          : 0;
+  auto indentForLineNumbers = [&] {
+    if (MaxLineNoDisplayWidth > 0) {
+      OS << ' ';
+      for (unsigned I = 0; I != MaxLineNoDisplayWidth; ++I)
+        OS << ' ';
+      OS << " | ";
+    }
+  };
+
+  for (unsigned LineNo = Lines.first; LineNo != Lines.second + 1;
+       ++LineNo, ++DisplayLineNo) {
     const char *BufStart = BufData.data();
     const char *BufEnd = BufStart + BufData.size();
 
@@ -1245,9 +1270,10 @@ void TextDiagnostic::emitSnippetAndCaret(
       CaretLine.erase(CaretLine.end() - 1);
 
     // Emit what we have computed.
-    emitSnippet(SourceLine);
+    emitSnippet(SourceLine, MaxLineNoDisplayWidth, DisplayLineNo);
 
     if (!CaretLine.empty()) {
+      indentForLineNumbers();
       if (DiagOpts->ShowColors)
         OS.changeColor(caretColor, true);
       OS << CaretLine << '\n';
@@ -1256,6 +1282,7 @@ void TextDiagnostic::emitSnippetAndCaret(
     }
 
     if (!FixItInsertionLine.empty()) {
+      indentForLineNumbers();
       if (DiagOpts->ShowColors)
         // Print fixit line in color
         OS.changeColor(fixitColor, false);
@@ -1271,7 +1298,8 @@ void TextDiagnostic::emitSnippetAndCaret(
   emitParseableFixits(Hints, SM);
 }
 
-void TextDiagnostic::emitSnippet(StringRef line) {
+void TextDiagnostic::emitSnippet(StringRef line, unsigned MaxLineNoDisplayWidth,
+                                 unsigned LineNo) {
   if (line.empty())
     return;
 
@@ -1280,6 +1308,16 @@ void TextDiagnostic::emitSnippet(StringRef line) {
   std::string to_print;
   bool print_reversed = false;
 
+  // Emit line number.
+  if (MaxLineNoDisplayWidth > 0) {
+    unsigned LineNoDisplayWidth = getNumDisplayWidth(LineNo);
+    OS << ' ';
+    for (unsigned I = LineNoDisplayWidth; I < MaxLineNoDisplayWidth; ++I)
+      OS << ' ';
+    OS << LineNo;
+    OS << " | ";
+  }
+
   while (i<line.size()) {
     std::pair<SmallString<16>,bool> res
         = printableTextForNextCharacter(line, &i, DiagOpts->TabStop);

diff  --git a/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp b/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
index 85dd77f9a8774..30798793ceab1 100644
--- a/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
+++ b/clang/test/Analysis/Checkers/WebKit/uncounted-lambda-captures.cpp
@@ -5,14 +5,14 @@ void raw_ptr() {
   RefCountable* ref_countable = nullptr;
   auto foo1 = [ref_countable](){};
   // CHECK: warning: Captured raw-pointer 'ref_countable' to uncounted type is unsafe [webkit.UncountedLambdaCapturesChecker]
-  // CHECK-NEXT:{{^}}  auto foo1 = [ref_countable](){};
-  // CHECK-NEXT:{{^}}               ^
+  // CHECK-NEXT:{{^   6 | }}  auto foo1 = [ref_countable](){};
+  // CHECK-NEXT:{{^     | }}               ^
   auto foo2 = [&ref_countable](){};
   // CHECK: warning: Captured raw-pointer 'ref_countable' to uncounted type is unsafe [webkit.UncountedLambdaCapturesChecker]
   auto foo3 = [&](){ ref_countable = nullptr; };
   // CHECK: warning: Implicitly captured raw-pointer 'ref_countable' to uncounted type is unsafe [webkit.UncountedLambdaCapturesChecker]
-  // CHECK-NEXT:{{^}}  auto foo3 = [&](){ ref_countable = nullptr; };
-  // CHECK-NEXT:{{^}}                     ^
+  // CHECK-NEXT:{{^  12 | }}  auto foo3 = [&](){ ref_countable = nullptr; };
+  // CHECK-NEXT:{{^     | }}                     ^
   auto foo4 = [=](){ (void) ref_countable; };
   // CHECK: warning: Implicitly captured raw-pointer 'ref_countable' to uncounted type is unsafe [webkit.UncountedLambdaCapturesChecker]
 }

diff  --git a/clang/test/FixIt/fixit-function-call.cpp b/clang/test/FixIt/fixit-function-call.cpp
index 88f636ea5859d..17c50adffc4a2 100644
--- a/clang/test/FixIt/fixit-function-call.cpp
+++ b/clang/test/FixIt/fixit-function-call.cpp
@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 -fdiagnostics-parseable-fixits -x c++ %s 2> %t
+// RUN: not %clang_cc1 -fdiagnostics-parseable-fixits -fno-diagnostics-show-line-numbers -fcaret-diagnostics-max-lines 1 -x c++ %s 2> %t
 // RUN: FileCheck %s < %t
 // PR5941
 // END.

diff  --git a/clang/test/FixIt/fixit-newline-style.c b/clang/test/FixIt/fixit-newline-style.c
index 8c5f424c39873..091b79426bcdf 100644
--- a/clang/test/FixIt/fixit-newline-style.c
+++ b/clang/test/FixIt/fixit-newline-style.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -pedantic -Wunused-label -x c %s 2>&1 | FileCheck %s -strict-whitespace
+// RUN: %clang_cc1 -pedantic -Wunused-label -fno-diagnostics-show-line-numbers -x c %s 2>&1 | FileCheck %s -strict-whitespace
 
 // This file intentionally uses a CRLF newline style
 // <rdar://problem/12639047>

diff  --git a/clang/test/FixIt/fixit-unicode-with-utf8-output.c b/clang/test/FixIt/fixit-unicode-with-utf8-output.c
index a1a7bb7338095..f5aec89939adf 100644
--- a/clang/test/FixIt/fixit-unicode-with-utf8-output.c
+++ b/clang/test/FixIt/fixit-unicode-with-utf8-output.c
@@ -1,7 +1,7 @@
 // This test is an additional set of checks for the fixit-unicode.c test for
 // systems capable of outputting Unicode characters to the standard output in
 // the UTF-8 encoding.
-// RUN: not %clang_cc1 -fsyntax-only %S/fixit-unicode.c 2>&1 | FileCheck -strict-whitespace %s
+// RUN: not %clang_cc1 -fsyntax-only -fno-diagnostics-show-line-numbers %S/fixit-unicode.c 2>&1 | FileCheck -strict-whitespace %s
 // REQUIRES: utf8-capable-terminal
 
 // CHECK: warning: format specifies type 'int' but the argument has type 'long'

diff  --git a/clang/test/FixIt/fixit-unicode.c b/clang/test/FixIt/fixit-unicode.c
index 70c9751a2bcd6..87819cdfbea17 100644
--- a/clang/test/FixIt/fixit-unicode.c
+++ b/clang/test/FixIt/fixit-unicode.c
@@ -2,8 +2,8 @@
 // There's a set of additional checks for systems with proper support of UTF-8
 // on the standard output in fixit-unicode-with-utf8-output.c.
 
-// RUN: not %clang_cc1 -fsyntax-only %s 2>&1 | FileCheck -strict-whitespace %s
-// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck -check-prefix=CHECK-MACHINE %s
+// RUN: not %clang_cc1 -fsyntax-only -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -strict-whitespace %s
+// RUN: not %clang_cc1 -fsyntax-only -fno-diagnostics-show-line-numbers -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck -check-prefix=CHECK-MACHINE %s
 
 struct Foo {
   int bar;

diff  --git a/clang/test/Frontend/source-col-map.c b/clang/test/Frontend/source-col-map.c
index b257261b8b2bc..20030a28f5c19 100644
--- a/clang/test/Frontend/source-col-map.c
+++ b/clang/test/Frontend/source-col-map.c
@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 -fsyntax-only -fmessage-length=75 -o /dev/null -x c < %s 2>&1 | FileCheck %s -strict-whitespace
+// RUN: not %clang_cc1 -fsyntax-only -fno-diagnostics-show-line-numbers -fmessage-length=75 -o /dev/null -x c < %s 2>&1 | FileCheck %s -strict-whitespace
 // REQUIRES: utf8-capable-terminal
 
 // Test case for the text diagnostics source column conversion crash.

diff  --git a/clang/test/Lexer/header.cpp b/clang/test/Lexer/header.cpp
index f02b1e69db439..34ed2686b0e72 100644
--- a/clang/test/Lexer/header.cpp
+++ b/clang/test/Lexer/header.cpp
@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 -fsyntax-only -Wno-header-guard %s
-// RUN: %clang_cc1 -fsyntax-only -Wheader-guard %s 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -fsyntax-only -Wheader-guard -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck %s
 
 #include "Inputs/good-header-guard.h"
 #include "Inputs/no-define.h"

diff  --git a/clang/test/Lexer/string-literal-errors.cpp b/clang/test/Lexer/string-literal-errors.cpp
index 223dca4b94f62..c819ba435dbd2 100644
--- a/clang/test/Lexer/string-literal-errors.cpp
+++ b/clang/test/Lexer/string-literal-errors.cpp
@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 -fsyntax-only %s 2>&1 | FileCheck -strict-whitespace %s
+// RUN: not %clang_cc1 -fsyntax-only -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -strict-whitespace %s
 
 void foo() {
   (void)"\q \u123z \x \U \U123 \U12345 \u123 \xyzzy \777 \U"

diff  --git a/clang/test/Misc/caret-diags-macros.c b/clang/test/Misc/caret-diags-macros.c
index e60ed389e656c..13b084b853acc 100644
--- a/clang/test/Misc/caret-diags-macros.c
+++ b/clang/test/Misc/caret-diags-macros.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only %s 2>&1 | FileCheck %s -strict-whitespace
+// RUN: %clang_cc1 -fsyntax-only -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck %s -strict-whitespace
 
 #define M1(x) x
 #define M2 1;

diff  --git a/clang/test/Misc/caret-diags-multiline.cpp b/clang/test/Misc/caret-diags-multiline.cpp
index 90b50ff398ace..baf8e5a219be3 100644
--- a/clang/test/Misc/caret-diags-multiline.cpp
+++ b/clang/test/Misc/caret-diags-multiline.cpp
@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 -std=c++11 -fcaret-diagnostics-max-lines 5 -Wsometimes-uninitialized %s 2>&1 | FileCheck %s --strict-whitespace
+// RUN: not %clang_cc1 -std=c++11 -fno-diagnostics-show-line-numbers -fcaret-diagnostics-max-lines 5 -Wsometimes-uninitialized %s 2>&1 | FileCheck %s --strict-whitespace
 
 void line(int);
 

diff  --git a/clang/test/Misc/diag-macro-backtrace.c b/clang/test/Misc/diag-macro-backtrace.c
index 8d7d5726ad82d..0eb7bbb9f3355 100644
--- a/clang/test/Misc/diag-macro-backtrace.c
+++ b/clang/test/Misc/diag-macro-backtrace.c
@@ -1,4 +1,4 @@
-// RUN: not %clang -fsyntax-only -fmacro-backtrace-limit=0 %s 2>&1 | FileCheck %s
+// RUN: not %clang -fsyntax-only -fno-diagnostics-show-line-numbers -fmacro-backtrace-limit=0 %s 2>&1 | FileCheck %s
 
 #define FOO 1+"hi" 
 #define BAR FOO

diff  --git a/clang/test/Misc/message-length.c b/clang/test/Misc/message-length.c
index 1e0b4edb7c032..4e2818121a132 100644
--- a/clang/test/Misc/message-length.c
+++ b/clang/test/Misc/message-length.c
@@ -28,7 +28,7 @@ void a_very_long_line(int *ip, float *FloatPointer) {
 #pragma STDC CX_LIMITED_RANGE    // some long comment text and a brace, eh {}
 
 // CHECK: FILE:23:78
-// CHECK: {{^  ...// some long comment text and a brace, eh {}}}
+// CHECK: {{^   23 |  ...// some long comment text and a brace, eh {}}}
 
 struct A { int x; };
 void h(struct A *a) {

diff  --git a/clang/test/Misc/tabstop.c b/clang/test/Misc/tabstop.c
index 500bf2a834a31..834d1839a3d8b 100644
--- a/clang/test/Misc/tabstop.c
+++ b/clang/test/Misc/tabstop.c
@@ -1,7 +1,7 @@
-// RUN: %clang_cc1 -ftabstop 3   -fsyntax-only -Wno-error=int-conversion %s 2>&1 | FileCheck -check-prefix=CHECK-3   -strict-whitespace %s
-// RUN: %clang_cc1 -ftabstop 4   -fsyntax-only -Wno-error=int-conversion %s 2>&1 | FileCheck -check-prefix=CHECK-4   -strict-whitespace %s
-// RUN: %clang_cc1 -ftabstop 5   -fsyntax-only -Wno-error=int-conversion %s 2>&1 | FileCheck -check-prefix=CHECK-5   -strict-whitespace %s
-// RUN: %clang_cc1 -ftabstop 101 -fsyntax-only -Wno-error=int-conversion %s 2>&1 | FileCheck -check-prefix=CHECK-101 -strict-whitespace %s
+// RUN: %clang_cc1 -ftabstop 3 -fsyntax-only -Wno-error=int-conversion -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -check-prefix=CHECK-3 -strict-whitespace %s
+// RUN: %clang_cc1 -ftabstop 4 -fsyntax-only -Wno-error=int-conversion -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -check-prefix=CHECK-4 -strict-whitespace %s
+// RUN: %clang_cc1 -ftabstop 5 -fsyntax-only -Wno-error=int-conversion -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -check-prefix=CHECK-5 -strict-whitespace %s
+// RUN: %clang_cc1 -ftabstop 101 -fsyntax-only -Wno-error=int-conversion -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -check-prefix=CHECK-101 -strict-whitespace %s
 
 // tab
 	void* a = 1;

diff  --git a/clang/test/Misc/unnecessary-elipses.cpp b/clang/test/Misc/unnecessary-elipses.cpp
index c8c178c37f6c6..b9f7cb7d3e00e 100644
--- a/clang/test/Misc/unnecessary-elipses.cpp
+++ b/clang/test/Misc/unnecessary-elipses.cpp
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -fmessage-length=80 %s 2>&1 | FileCheck -strict-whitespace %s
+// RUN: %clang_cc1 -fsyntax-only -fmessage-length=80 -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck -strict-whitespace %s
 
 int main() {
     "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

diff  --git a/clang/test/Misc/unprintable.c b/clang/test/Misc/unprintable.c
index 30e4494566300..02402cdfa6693 100644
--- a/clang/test/Misc/unprintable.c
+++ b/clang/test/Misc/unprintable.c
@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 %s -fmessage-length=40 2>&1 | FileCheck -strict-whitespace %s
+// RUN: not %clang_cc1 %s -fmessage-length=40 -fno-diagnostics-show-line-numbers 2>&1 | FileCheck -strict-whitespace %s
 
 int main() {
     int i;

diff  --git a/clang/test/Misc/wrong-encoding.c b/clang/test/Misc/wrong-encoding.c
index 4d8aa94ffffb2..98c1ecb9b5a66 100644
--- a/clang/test/Misc/wrong-encoding.c
+++ b/clang/test/Misc/wrong-encoding.c
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -fsyntax-only -Wno-unused-value %s 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -fsyntax-only -Wno-unused-value -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck %s
 // REQUIRES: asserts
 
 void foo(void) {

diff  --git a/clang/test/Parser/brackets.c b/clang/test/Parser/brackets.c
index a651c35d073a8..1821747d13515 100644
--- a/clang/test/Parser/brackets.c
+++ b/clang/test/Parser/brackets.c
@@ -2,7 +2,7 @@
 // RUN: cp %s %t
 // RUN: not %clang_cc1 -fixit %t -x c -DFIXIT
 // RUN: %clang_cc1 -fsyntax-only %t -x c -DFIXIT
-// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s -strict-whitespace
+// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-parseable-fixits -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck %s -strict-whitespace
 
 void test1(void) {
   int a[] = {0,1,1,2,3};

diff  --git a/clang/test/Parser/brackets.cpp b/clang/test/Parser/brackets.cpp
index 415cbdda83f5f..40b08c37a06a1 100644
--- a/clang/test/Parser/brackets.cpp
+++ b/clang/test/Parser/brackets.cpp
@@ -2,7 +2,7 @@
 // RUN: cp %s %t
 // RUN: not %clang_cc1 -fixit %t -x c++ -DFIXIT
 // RUN: %clang_cc1 -fsyntax-only %t -x c++ -DFIXIT
-// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s -strict-whitespace
+// RUN: not %clang_cc1 -fsyntax-only -fdiagnostics-parseable-fixits -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck %s -strict-whitespace
 
 void test1() {
   int a[] = {0,1,1,2,3};

diff  --git a/clang/test/Preprocessor/ucn-pp-identifier.c b/clang/test/Preprocessor/ucn-pp-identifier.c
index e1bcdfdcaa364..0cdff6e9db568 100644
--- a/clang/test/Preprocessor/ucn-pp-identifier.c
+++ b/clang/test/Preprocessor/ucn-pp-identifier.c
@@ -112,9 +112,9 @@ C 1
 #define capital_u_\U00FC
 // expected-warning at -1 {{incomplete universal character name}} expected-note at -1 {{did you mean to use '\u'?}} expected-warning at -1 {{whitespace}}
 // CHECK: note: did you mean to use '\u'?
-// CHECK-NEXT:   #define capital_u_\U00FC
-// CHECK-NEXT: {{^                   \^}}
-// CHECK-NEXT: {{^                   u}}
+// CHECK-NEXT: {{^  112 | #define capital_u_\U00FC}}
+// CHECK-NEXT: {{^      |                    \^}}
+// CHECK-NEXT: {{^      |                    u}}
 
 #define \u{}           // expected-warning {{empty delimited universal character name; treating as '\' 'u' '{' '}'}} expected-error {{macro name must be an identifier}}
 #define \u1{123}       // expected-warning {{incomplete universal character name; treating as '\' followed by identifier}} expected-error {{macro name must be an identifier}}

diff  --git a/clang/test/Sema/caret-diags-complex-init.cpp b/clang/test/Sema/caret-diags-complex-init.cpp
index d8a1b7837a640..83aab5c4e0b7d 100644
--- a/clang/test/Sema/caret-diags-complex-init.cpp
+++ b/clang/test/Sema/caret-diags-complex-init.cpp
@@ -1,4 +1,4 @@
-// RUN: not %clang_cc1 -std=c++11 -fsyntax-only -fcaret-diagnostics-max-lines 5 %s 2>&1 | FileCheck %s -strict-whitespace
+// RUN: not %clang_cc1 -std=c++11 -fsyntax-only -fno-diagnostics-show-line-numbers -fcaret-diagnostics-max-lines 5 %s 2>&1 | FileCheck %s -strict-whitespace
 
 
 //CHECK: {{.*}}: error: excess elements in scalar initializer

diff  --git a/clang/test/SemaCXX/struct-class-redecl.cpp b/clang/test/SemaCXX/struct-class-redecl.cpp
index 622d5a0b652a7..ab6488b237f55 100644
--- a/clang/test/SemaCXX/struct-class-redecl.cpp
+++ b/clang/test/SemaCXX/struct-class-redecl.cpp
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -fsyntax-only -Wmismatched-tags -verify %s
-// RUN: not %clang_cc1 -fsyntax-only -Wmismatched-tags %s 2>&1 | FileCheck %s
+// RUN: %clang_cc1 -fsyntax-only -Wmismatched-tags -fno-diagnostics-show-line-numbers -verify %s
+// RUN: not %clang_cc1 -fsyntax-only -Wmismatched-tags -fno-diagnostics-show-line-numbers %s 2>&1 | FileCheck %s
 class X; // expected-note 2{{here}}
 typedef struct X * X_t; // expected-warning{{previously declared}}
 union X { int x; float y; }; // expected-error{{use of 'X' with tag type that does not match previous declaration}}

diff  --git a/lldb/test/API/commands/expression/diagnostics/TestExprDiagnostics.py b/lldb/test/API/commands/expression/diagnostics/TestExprDiagnostics.py
index 72154ef4622e1..bf1fc8e4e0e0a 100644
--- a/lldb/test/API/commands/expression/diagnostics/TestExprDiagnostics.py
+++ b/lldb/test/API/commands/expression/diagnostics/TestExprDiagnostics.py
@@ -30,20 +30,38 @@ def test_source_and_caret_printing(self):
         self.assertFalse(value.GetError().Success())
         # We should get a nice diagnostic with a caret pointing at the start of
         # the identifier.
-        self.assertIn("\nunknown_identifier\n^\n", value.GetError().GetCString())
+        self.assertIn(
+            """
+    1 | unknown_identifier
+      | ^
+""",
+            value.GetError().GetCString(),
+        )
         self.assertIn("<user expression 0>:1:1", value.GetError().GetCString())
 
         # Same as above but with the identifier in the middle.
-        value = frame.EvaluateExpression("1 + unknown_identifier  ")
+        value = frame.EvaluateExpression("1 + unknown_identifier")
         self.assertFalse(value.GetError().Success())
-        self.assertIn("\n1 + unknown_identifier", value.GetError().GetCString())
-        self.assertIn("\n    ^\n", value.GetError().GetCString())
+        self.assertIn(
+            """
+    1 | 1 + unknown_identifier
+      |     ^
+""",
+            value.GetError().GetCString(),
+        )
 
         # Multiline expressions.
         value = frame.EvaluateExpression("int a = 0;\nfoobar +=1;\na")
         self.assertFalse(value.GetError().Success())
         # We should still get the right line information and caret position.
-        self.assertIn("\nfoobar +=1;\n^\n", value.GetError().GetCString())
+        self.assertIn(
+            """
+    2 | foobar +=1;
+      | ^
+""",
+            value.GetError().GetCString(),
+        )
+
         # It's the second line of the user expression.
         self.assertIn("<user expression 2>:2:1", value.GetError().GetCString())
 
@@ -54,8 +72,13 @@ def test_source_and_caret_printing(self):
         value = frame.EvaluateExpression("void foo(unknown_type x) {}", top_level_opts)
         self.assertFalse(value.GetError().Success())
         self.assertIn(
-            "\nvoid foo(unknown_type x) {}\n         ^\n", value.GetError().GetCString()
+            """
+    1 | void foo(unknown_type x) {}
+      |          ^
+""",
+            value.GetError().GetCString(),
         )
+
         # Top-level expressions might use a 
diff erent wrapper code, but the file name should still
         # be the same.
         self.assertIn("<user expression 3>:1:10", value.GetError().GetCString())
@@ -63,7 +86,14 @@ def test_source_and_caret_printing(self):
         # Multiline top-level expressions.
         value = frame.EvaluateExpression("void x() {}\nvoid foo;", top_level_opts)
         self.assertFalse(value.GetError().Success())
-        self.assertIn("\nvoid foo;\n     ^", value.GetError().GetCString())
+        self.assertIn(
+            """
+    2 | void foo;
+      |      ^
+""",
+            value.GetError().GetCString(),
+        )
+
         self.assertIn("<user expression 4>:2:6", value.GetError().GetCString())
 
         # Test that we render Clang's 'notes' correctly.
@@ -72,7 +102,14 @@ def test_source_and_caret_printing(self):
         )
         self.assertFalse(value.GetError().Success())
         self.assertIn(
-            "<user expression 5>:1:8: previous definition is here\nstruct SFoo{}; struct SFoo { int x; };\n       ^\n",
+            "<user expression 5>:1:8: previous definition is here\n",
+            value.GetError().GetCString(),
+        )
+        self.assertIn(
+            """
+    1 | struct SFoo{}; struct SFoo { int x; };
+      |        ^
+""",
             value.GetError().GetCString(),
         )
 
@@ -82,14 +119,29 @@ def test_source_and_caret_printing(self):
         value = frame.EvaluateExpression("struct FooBar { double x };", top_level_opts)
         self.assertFalse(value.GetError().Success())
         self.assertIn(
-            "error: <user expression 6>:1:8: redefinition of 'FooBar'\nstruct FooBar { double x };\n       ^\n",
+            "error: <user expression 6>:1:8: redefinition of 'FooBar'\n",
+            value.GetError().GetCString(),
+        )
+        self.assertIn(
+            """
+    1 | struct FooBar { double x };
+      |        ^
+""",
             value.GetError().GetCString(),
         )
 
         value = frame.EvaluateExpression("foo(1, 2)")
         self.assertFalse(value.GetError().Success())
         self.assertIn(
-            "error: <user expression 7>:1:1: no matching function for call to 'foo'\nfoo(1, 2)\n^~~\nnote: candidate function not viable: requires single argument 'x', but 2 arguments were provided\n\n",
+            "error: <user expression 7>:1:1: no matching function for call to 'foo'\n",
+            value.GetError().GetCString(),
+        )
+        self.assertIn(
+            """
+    1 | foo(1, 2)
+      | ^~~
+note: candidate function not viable: requires single argument 'x', but 2 arguments were provided
+""",
             value.GetError().GetCString(),
         )
 
@@ -99,7 +151,14 @@ def test_source_and_caret_printing(self):
         value = frame.EvaluateExpression("struct Redef { float y; };", top_level_opts)
         self.assertFalse(value.GetError().Success())
         self.assertIn(
-            "error: <user expression 9>:1:8: redefinition of 'Redef'\nstruct Redef { float y; };\n       ^\n<user expression 8>:1:8: previous definition is here\nstruct Redef { double x; };\n       ^",
+            """
+error: <user expression 9>:1:8: redefinition of 'Redef'
+    1 | struct Redef { float y; };
+      |        ^
+<user expression 8>:1:8: previous definition is here
+    1 | struct Redef { double x; };
+      |        ^
+""",
             value.GetError().GetCString(),
         )
 


        


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