[PATCH] D136712: Define _GNU_SOURCE for arm baremetal in C++ mode.

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

The `_GNU_SOURCE` definition needs to be guarded by `if (Opts.CPlusPlus)`.



================
Comment at: clang/test/Driver/arm-baremetal-defines.cpp:1
+// RUN: %clang --target=arm-none-eabi -march=armv7-m %s -emit-llvm -S -c -o - 2>&1 | FileCheck %s
+
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Move this to `test/Preprocessor/init-arm.c`


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D136712/new/

https://reviews.llvm.org/D136712