https://github.com/AaronBallman created
https://github.com/llvm/llvm-project/pull/147284
cl.exe has /stdc:latest, analogous to /stdc++:latest, which sets the language
mode to the latest standard. For C, that's C23. This adds support for the
option.
Fixes #147233
>From 926fd7ce1264bd263a9fd46409ec7cc8e2d2db27 Mon Sep 17 00:00:00 2001
From: Aaron Ballman <aa...@aaronballman.com>
Date: Mon, 7 Jul 2025 07:47:54 -0400
Subject: [PATCH] [clang-cl] Support /stdc:latest
cl.exe has /stdc:latest, analogous to /stdc++:latest, which sets the
language mode to the latest standard. For C, that's C23. This adds
support for the option.
Fixes #147233
---
clang/docs/ReleaseNotes.rst | 4 +++-
clang/lib/Driver/ToolChains/Clang.cpp | 2 ++
clang/test/Driver/cl-options.c | 6 ++++++
3 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 3d893e0aa8e2c..2052b43f48070 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -248,7 +248,9 @@ C Language Changes
not valid in C++.
- The ``[[clang::assume()]]`` attribute is now correctly recognized in C. The
``__attribute__((assume()))`` form has always been supported, so the fix is
- specific to the attribute syntax used.
+ specific to the attribute syntax used.'
+- The ``clang-cl`` driver now recognizes ``/stdc:latest`` and sets the language
+ mode to C23. #GH147233
C2y Feature Support
^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp
b/clang/lib/Driver/ToolChains/Clang.cpp
index fea4ee909ff46..8a30b7ea8144a 100644
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -7201,6 +7201,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction
&JA,
LanguageStandard = llvm::StringSwitch<StringRef>(StdArg->getValue())
.Case("c11", "-std=c11")
.Case("c17", "-std=c17")
+ // TODO: add c23 when MSVC supports it.
+ .Case("clatest", "-std=c23")
.Default("");
if (LanguageStandard.empty())
D.Diag(clang::diag::warn_drv_unused_argument)
diff --git a/clang/test/Driver/cl-options.c b/clang/test/Driver/cl-options.c
index eb079895a0a88..57e16e8795a28 100644
--- a/clang/test/Driver/cl-options.c
+++ b/clang/test/Driver/cl-options.c
@@ -362,6 +362,12 @@
// RUN: %clang_cl -c -### /std:c11 -- %s 2>&1 | FileCheck -check-prefix
CHECK-C11 %s
// CHECK-C11: -std=c11
+// RUN: %clang_cl -c -### /std:c17 -- %s 2>&1 | FileCheck -check-prefix
CHECK-C17 %s
+// CHECK-C17: -std=c17
+
+// RUN: %clang_cl -c -### /std:clatest -- %s 2>&1 | FileCheck -check-prefix
CHECK-CLATEST %s
+// CHECK-CLATEST: -std=c23
+
// For some warning ids, we can map from MSVC warning to Clang warning.
// RUN: %clang_cl -wd4005 -wd4100 -wd4910 -wd4996 -wd12345678 -### -- %s 2>&1
| FileCheck -check-prefix=Wno %s
// Wno: "-cc1"
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