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Guard a feature that unsupported by old GCC

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Summary:
As @david2050 commented, changes introduced by https://reviews.llvm.org/D56397 break builds for older compilers
which don't support `__has(_cpp)_attribute`. This is a fix for the break.

Reviewers: protze.joachim, jlpeyton, AndreyChurbanov, Hahnfeld, david2050

Subscribers: openmp-commits, david2050

Tags: #openmp

Differential Revision: https://reviews.llvm.org/D57851

llvm-svn: 353538
This commit is contained in:
Taewook Oh
2019-02-08 17:15:50 +00:00
parent 3ce8112dad
commit 91c32fd8c8
1 changed files with 9 additions and 1 deletions
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10
openmp/runtime/src/kmp_os.h
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@@ -39,6 +39,14 @@
#define KMP_MEM_CONS_MODEL KMP_MEM_CONS_VOLATILE
#endif
#ifndef __has_cpp_attribute
#define __has_cpp_attribute(x) 0
#endif
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
/* ------------------------- Compiler recognition ---------------------- */
#define KMP_COMPILER_ICC 0
#define KMP_COMPILER_GCC 0
@@ -304,7 +312,7 @@ extern "C" {
# define KMP_FALLTHROUGH() [[fallthrough]]
#elif __has_cpp_attribute(clang::fallthrough)
# define KMP_FALLTHROUGH() [[clang::fallthrough]]
#elif __has_attribute(fallthough) || _GNUC_VER >= 700
#elif __has_attribute(fallthough) || __GNUC__ >= 7
# define KMP_FALLTHROUGH() __attribute__((__fallthrough__))
#else
# define KMP_FALLTHROUGH() ((void)0)