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Check for sys/auxv.h (#6359)

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Summary:
Check for sys/auxv.h and getauxval before using them as they are not
always available (for example on uclibc)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6359

Differential Revision: D20239797

fbshipit-source-id: 175a098094d81545628c2372e7c388e70a32fd48
This commit is contained in:
Fabrice Fontaine 2020-03-03 18:06:56 -08:00 committed by Facebook Github Bot
parent 03dbd11ead
commit 8bbd76edbf
4 changed files with 28 additions and 1 deletions
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5
CMakeLists.txt
View File

@ -481,6 +481,11 @@ if(HAVE_SCHED_GETCPU)
add_definitions(-DROCKSDB_SCHED_GETCPU_PRESENT)
endif()
check_cxx_symbol_exists(getauxval auvx.h HAVE_AUXV_GETAUXVAL)
if(HAVE_AUXV_GETAUXVAL)
add_definitions(-DROCKSDB_AUXV_GETAUXVAL_PRESENT)
endif()
include_directories(${PROJECT_SOURCE_DIR})
include_directories(${PROJECT_SOURCE_DIR}/include)
include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/third-party/gtest-1.8.1/fused-src)

14
build_tools/build_detect_platform
View File

@ -508,6 +508,20 @@ EOF
fi
fi
if ! test $ROCKSDB_DISABLE_AUXV_GETAUXVAL; then
# Test whether getauxval is supported
$CXX $CFLAGS -x c++ - -o /dev/null 2>/dev/null <<EOF
#include <sys/auxv.h>
int main() {
uint64_t auxv = getauxval(AT_HWCAP);
(void)auxv;
}
EOF
if [ "$?" = 0 ]; then
COMMON_FLAGS="$COMMON_FLAGS -DROCKSDB_AUXV_GETAUXVAL_PRESENT"
fi
fi
if ! test $ROCKSDB_DISABLE_ALIGNED_NEW; then
# Test whether c++17 aligned-new is supported
$CXX $PLATFORM_CXXFLAGS -faligned-new -x c++ - -o /dev/null 2>/dev/null <<EOF

4
util/crc32c.cc
View File

@ -25,7 +25,9 @@
#include "util/crc32c_ppc_constants.h"
#if __linux__
#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
#include <sys/auxv.h>
#endif
#ifndef PPC_FEATURE2_VEC_CRYPTO
#define PPC_FEATURE2_VEC_CRYPTO 0x02000000
@ -451,7 +453,7 @@ uint32_t ExtendPPCImpl(uint32_t crc, const char *buf, size_t size) {
static int arch_ppc_probe(void) {
arch_ppc_crc32 = 0;
#if defined(__powerpc64__)
#if defined(__powerpc64__) && defined(ROCKSDB_AUXV_GETAUXVAL_PRESENT)
if (getauxval(AT_HWCAP2) & PPC_FEATURE2_VEC_CRYPTO) arch_ppc_crc32 = 1;
#endif /* __powerpc64__ */

6
util/crc32c_arm64.cc
View File

@ -8,7 +8,9 @@
#if defined(__linux__) && defined(HAVE_ARM64_CRC)
#include <asm/hwcap.h>
#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
#include <sys/auxv.h>
#endif
#ifndef HWCAP_CRC32
#define HWCAP_CRC32 (1 << 7)
#endif
@ -34,8 +36,12 @@
#endif
uint32_t crc32c_runtime_check(void) {
#ifdef ROCKSDB_AUXV_GETAUXVAL_PRESENT
uint64_t auxv = getauxval(AT_HWCAP);
return (auxv & HWCAP_CRC32) != 0;
#else
return 0;
#endif
}
uint32_t crc32c_arm64(uint32_t crc, unsigned char const *data,