[PATCH] D114867: [clang-cl] Set _MSVC_LANG to 202002L with /std:c++20

Nico Weber via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Wed Dec 1 05:47:28 PST 2021

thakis created this revision.
thakis added a reviewer: hans.
thakis requested review of this revision.

MSVC says this should be 202002L for /std:c++20, and of VS16.11
that's indeed the case (older versions warn that they don't
understand /std:c++20, and then cl.exe defaults to C++14 and
sets _MSVC_LANG to 201402 accordingly).



Index: clang/test/Preprocessor/predefined-win-macros.c
--- clang/test/Preprocessor/predefined-win-macros.c
+++ clang/test/Preprocessor/predefined-win-macros.c
@@ -45,9 +45,9 @@
 // RUN: %clang_cc1 %s -x c++ -E -dM -triple i686-pc-win32 -fms-extensions -fms-compatibility \
-// RUN:     -fms-compatibility-version=19.00 -std=c++2a -o - | FileCheck -match-full-lines %s --check-prefix=CHECK-MS-CPP2A
+// RUN:     -fms-compatibility-version=19.00 -std=c++20 -o - | FileCheck -match-full-lines %s --check-prefix=CHECK-MS-CPP2A
 // CHECK-MS-CPP2A: #define _MSC_VER 1900
-// CHECK-MS-CPP2A: #define _MSVC_LANG 201705L
+// CHECK-MS-CPP2A: #define _MSVC_LANG 202002L
 // RUN: %clang_cc1 -triple i386-windows %s -E -dM -o - \
 // RUN:   | FileCheck -match-full-lines %s --check-prefix=CHECK-X86-WIN
Index: clang/lib/Basic/Targets/OSTargets.cpp
--- clang/lib/Basic/Targets/OSTargets.cpp
+++ clang/lib/Basic/Targets/OSTargets.cpp
@@ -182,7 +182,7 @@
     if (Opts.isCompatibleWithMSVC(LangOptions::MSVC2015)) {
       if (Opts.CPlusPlus20)
-        Builder.defineMacro("_MSVC_LANG", "201705L");
+        Builder.defineMacro("_MSVC_LANG", "202002L");
       else if (Opts.CPlusPlus17)
         Builder.defineMacro("_MSVC_LANG", "201703L");
       else if (Opts.CPlusPlus14)

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D114867.390989.patch
Type: text/x-patch
Size: 1426 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20211201/d38a7546/attachment.bin>

More information about the cfe-commits mailing list