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[libFuzzer] Check for target(popcnt) capability before usage

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Older compilers (e.g. LLVM 3.4) do not support the attribute target("popcnt").
In order to support those, this diff check the attribute support using the preprocessor.

Patch by George Karpenkov.

Differential Revision: https://reviews.llvm.org/D32311



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300999 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kuba Mracek 2017-04-21 16:57:37 +00:00
parent 2602091f82
commit 50c9a25c60
1 changed files with 10 additions and 2 deletions
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12
lib/Fuzzer/FuzzerDefs.h
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@ -36,12 +36,20 @@
#error "Support for your platform has not been implemented"
#endif
#ifndef __has_attribute
# define __has_attribute(x) 0
#endif
#define LIBFUZZER_POSIX LIBFUZZER_APPLE || LIBFUZZER_LINUX
#ifdef __x86_64
#define ATTRIBUTE_TARGET_POPCNT __attribute__((target("popcnt")))
# if __has_attribute(target)
# define ATTRIBUTE_TARGET_POPCNT __attribute__((target("popcnt")))
# else
# define ATTRIBUTE_TARGET_POPCNT
# endif
#else
#define ATTRIBUTE_TARGET_POPCNT
# define ATTRIBUTE_TARGET_POPCNT
#endif