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# Copyright (c) 2023-present The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or https://opensource.org/license/mit/.
include(CheckCXXSourceCompiles)
include(CheckCXXSymbolExists)
include(CheckIncludeFileCXX)
# The following HAVE_{HEADER}_H variables go to the bitcoin-config.h header.
check_include_file_cxx(sys/prctl.h HAVE_SYS_PRCTL_H)
check_include_file_cxx(sys/resources.h HAVE_SYS_RESOURCES_H)
check_include_file_cxx(sys/vmmeter.h HAVE_SYS_VMMETER_H)
check_include_file_cxx(vm/vm_param.h HAVE_VM_VM_PARAM_H)
check_cxx_symbol_exists(O_CLOEXEC "fcntl.h" HAVE_O_CLOEXEC)
check_cxx_symbol_exists(fdatasync "unistd.h" HAVE_FDATASYNC)
check_cxx_symbol_exists(fork "unistd.h" HAVE_DECL_FORK)
check_cxx_symbol_exists(pipe2 "unistd.h" HAVE_DECL_PIPE2)
check_cxx_symbol_exists(setsid "unistd.h" HAVE_DECL_SETSID)
check_include_file_cxx(sys/types.h HAVE_SYS_TYPES_H)
check_include_file_cxx(ifaddrs.h HAVE_IFADDRS_H)
if(HAVE_SYS_TYPES_H AND HAVE_IFADDRS_H)
include(TestAppendRequiredLibraries)
test_append_socket_library(core_interface)
endif()
include(TestAppendRequiredLibraries)
test_append_atomic_library(core_interface)
check_cxx_symbol_exists(std::system "cstdlib" HAVE_STD_SYSTEM)
check_cxx_symbol_exists(::_wsystem "stdlib.h" HAVE__WSYSTEM)
if(HAVE_STD_SYSTEM OR HAVE__WSYSTEM)
set(HAVE_SYSTEM 1)
endif()
check_cxx_source_compiles("
#include <string.h>
int main()
{
char buf[100];
char* p{strerror_r(0, buf, sizeof buf)};
(void)p;
}
" STRERROR_R_CHAR_P
)
# Check for malloc_info (for memory statistics information in getmemoryinfo).
check_cxx_symbol_exists(malloc_info "malloc.h" HAVE_MALLOC_INFO)
# Check for mallopt(M_ARENA_MAX) (to set glibc arenas).
check_cxx_source_compiles("
#include <malloc.h>
int main()
{
mallopt(M_ARENA_MAX, 1);
}
" HAVE_MALLOPT_ARENA_MAX
)
# Check for posix_fallocate().
check_cxx_source_compiles("
// same as in src/util/fs_helpers.cpp
#ifdef __linux__
#ifdef _POSIX_C_SOURCE
#undef _POSIX_C_SOURCE
#endif
#define _POSIX_C_SOURCE 200112L
#endif // __linux__
#include <fcntl.h>
int main()
{
return posix_fallocate(0, 0, 0);
}
" HAVE_POSIX_FALLOCATE
)
# Check for strong getauxval() support in the system headers.
check_cxx_source_compiles("
#include <sys/auxv.h>
int main()
{
getauxval(AT_HWCAP);
}
" HAVE_STRONG_GETAUXVAL
)
# Check for UNIX sockets.
check_cxx_source_compiles("
#include <sys/socket.h>
#include <sys/un.h>
int main()
{
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
}
" HAVE_SOCKADDR_UN
)
# Check for different ways of gathering OS randomness:
# - Linux getrandom()
check_cxx_source_compiles("
#include <sys/random.h>
int main()
{
getrandom(nullptr, 32, 0);
}
" HAVE_GETRANDOM
)
# - BSD getentropy()
check_cxx_source_compiles("
#include <sys/random.h>
int main()
{
getentropy(nullptr, 32);
}
" HAVE_GETENTROPY_RAND
)
# - BSD sysctl()
check_cxx_source_compiles("
#include <sys/types.h>
#include <sys/sysctl.h>
#ifdef __linux__
#error Don't use sysctl on Linux, it's deprecated even when it works
#endif
int main()
{
sysctl(nullptr, 2, nullptr, nullptr, nullptr, 0);
}
" HAVE_SYSCTL
)
# - BSD sysctl(KERN_ARND)
check_cxx_source_compiles("
#include <sys/types.h>
#include <sys/sysctl.h>
#ifdef __linux__
#error Don't use sysctl on Linux, it's deprecated even when it works
#endif
int main()
{
static int name[2] = {CTL_KERN, KERN_ARND};
sysctl(name, 2, nullptr, nullptr, nullptr, 0);
}
" HAVE_SYSCTL_ARND
)
if(NOT MSVC)
include(CheckSourceCompilesAndLinks)
# Check for SSE4.1 intrinsics.
set(SSE41_CXXFLAGS -msse4.1)
check_cxx_source_compiles_with_flags("${SSE41_CXXFLAGS}" "
#include <immintrin.h>
int main()
{
__m128i a = _mm_set1_epi32(0);
__m128i b = _mm_set1_epi32(1);
__m128i r = _mm_blend_epi16(a, b, 0xFF);
return _mm_extract_epi32(r, 3);
}
" HAVE_SSE41
)
set(ENABLE_SSE41 ${HAVE_SSE41})
# Check for AVX2 intrinsics.
set(AVX2_CXXFLAGS -mavx -mavx2)
check_cxx_source_compiles_with_flags("${AVX2_CXXFLAGS}" "
#include <immintrin.h>
int main()
{
__m256i l = _mm256_set1_epi32(0);
return _mm256_extract_epi32(l, 7);
}
" HAVE_AVX2
)
set(ENABLE_AVX2 ${HAVE_AVX2})
# Check for x86 SHA-NI intrinsics.
set(X86_SHANI_CXXFLAGS -msse4 -msha)
check_cxx_source_compiles_with_flags("${X86_SHANI_CXXFLAGS}" "
#include <immintrin.h>
int main()
{
__m128i i = _mm_set1_epi32(0);
__m128i j = _mm_set1_epi32(1);
__m128i k = _mm_set1_epi32(2);
return _mm_extract_epi32(_mm_sha256rnds2_epu32(i, j, k), 0);
}
" HAVE_X86_SHANI
)
set(ENABLE_X86_SHANI ${HAVE_X86_SHANI})
# Check for ARMv8 SHA-NI intrinsics.
set(ARM_SHANI_CXXFLAGS -march=armv8-a+crypto)
check_cxx_source_compiles_with_flags("${ARM_SHANI_CXXFLAGS}" "
#include <arm_neon.h>
int main()
{
uint32x4_t a, b, c;
vsha256h2q_u32(a, b, c);
vsha256hq_u32(a, b, c);
vsha256su0q_u32(a, b);
vsha256su1q_u32(a, b, c);
}
" HAVE_ARM_SHANI
)
set(ENABLE_ARM_SHANI ${HAVE_ARM_SHANI})
endif()
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