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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

llvm-svn: 300999
This commit is contained in:
Kuba Mracek 2017-04-21 16:57:37 +00:00
parent 894da66320
commit 9eb170fede
1 changed files with 10 additions and 2 deletions
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12
llvm/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