[PATCH] D151301: [clang][Diagnostics] Print empty lines in multiline snippets

[Timm Bäder via Phabricator via cfe-commits]

tbaeder created this revision.
tbaeder added reviewers: clang, cjdb, aaron.ballman.
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We should preserve empty lines in output snippets.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151301

Files:
  clang/lib/Frontend/TextDiagnostic.cpp
  clang/test/Misc/diag-style.cpp


Index: clang/test/Misc/diag-style.cpp
===================================================================
--- /dev/null
+++ clang/test/Misc/diag-style.cpp
@@ -0,0 +1,12 @@
+// RUN: not %clang_cc1 -fsyntax-only %s 2>&1 | FileCheck -strict-whitespace %s
+
+/// empty lines in multi-line diagnostic snippets are preserved.
+static_assert(false &&
+
+              true, "");
+// CHECK: static assertion failed
+// CHECK-NEXT: {{^}}    4 | static_assert(false &&{{$}}
+// CHECK-NEXT: {{^}}      |               ^~~~~~~~{{$}}
+// CHECK-NEXT: {{^}}    5 | {{$}}
+// CHECK-NEXT: {{^}}    6 |               true, "");{{$}}
+// CHECK-NEXT: {{^}}      |               ~~~~{{$}}
Index: clang/lib/Frontend/TextDiagnostic.cpp
===================================================================
--- clang/lib/Frontend/TextDiagnostic.cpp
+++ clang/lib/Frontend/TextDiagnostic.cpp
@@ -1280,9 +1280,6 @@
 void TextDiagnostic::emitSnippet(StringRef SourceLine,
                                  unsigned MaxLineNoDisplayWidth,
                                  unsigned LineNo) {
-  if (SourceLine.empty())
-    return;
-
   // Emit line number.
   if (MaxLineNoDisplayWidth > 0) {
     unsigned LineNoDisplayWidth = getNumDisplayWidth(LineNo);


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