mirror of
https://github.com/ossrs/srs.git
synced 2025-02-13 20:01:56 +00:00
c5e067fb0b
fix https://github.com/ossrs/srs/issues/3155 Build srt-1-fit fails with `standard attributes in middle of decl-specifiers` on GCC 12,Arch Linux. See https://github.com/Haivision/srt/releases/tag/v1.5.3
113 lines
3.1 KiB
CMake
113 lines
3.1 KiB
CMake
#
|
|
# SRT - Secure, Reliable, Transport Copyright (c) 2021 Haivision Systems Inc.
|
|
#
|
|
# This Source Code Form is subject to the terms of the Mozilla Public License,
|
|
# v. 2.0. If a copy of the MPL was not distributed with this file, You can
|
|
# obtain one at http://mozilla.org/MPL/2.0/.
|
|
#
|
|
|
|
# Check for GCC Atomic Intrinsics and whether libatomic is required.
|
|
#
|
|
# Sets:
|
|
# HAVE_LIBATOMIC
|
|
# HAVE_LIBATOMIC_COMPILES
|
|
# HAVE_LIBATOMIC_COMPILES_STATIC
|
|
# HAVE_GCCATOMIC_INTRINSICS
|
|
# HAVE_GCCATOMIC_INTRINSICS_REQUIRES_LIBATOMIC
|
|
#
|
|
# See
|
|
# https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
|
|
# https://gcc.gnu.org/wiki/Atomic/GCCMM/AtomicSync
|
|
|
|
include(CheckCSourceCompiles)
|
|
include(CheckLibraryExists)
|
|
|
|
function(CheckGCCAtomicIntrinsics)
|
|
|
|
unset(HAVE_LIBATOMIC CACHE)
|
|
unset(HAVE_LIBATOMIC_COMPILES CACHE)
|
|
unset(HAVE_LIBATOMIC_COMPILES_STATIC CACHE)
|
|
unset(HAVE_GCCATOMIC_INTRINSICS CACHE)
|
|
unset(HAVE_GCCATOMIC_INTRINSICS_REQUIRES_LIBATOMIC CACHE)
|
|
|
|
set(CMAKE_TRY_COMPILE_TARGET_TYPE EXECUTABLE) # CMake 3.6
|
|
|
|
unset(CMAKE_REQUIRED_FLAGS)
|
|
unset(CMAKE_REQUIRED_LIBRARIES)
|
|
unset(CMAKE_REQUIRED_LINK_OPTIONS)
|
|
|
|
# Check for existence of libatomic and whether this symbol is present.
|
|
check_library_exists(atomic __atomic_fetch_add_8 "" HAVE_LIBATOMIC)
|
|
|
|
set(CheckLibAtomicCompiles_CODE
|
|
"
|
|
int main(void)
|
|
{
|
|
const int result = 0;
|
|
return result;
|
|
}
|
|
")
|
|
|
|
set(CMAKE_REQUIRED_LIBRARIES "atomic")
|
|
|
|
# Check that the compiler can build a simple application and link with
|
|
# libatomic.
|
|
check_c_source_compiles("${CheckLibAtomicCompiles_CODE}"
|
|
HAVE_LIBATOMIC_COMPILES)
|
|
if(NOT HAVE_LIBATOMIC_COMPILES)
|
|
set(HAVE_LIBATOMIC
|
|
0
|
|
CACHE INTERNAL "" FORCE)
|
|
endif()
|
|
if(HAVE_LIBATOMIC AND HAVE_LIBATOMIC_COMPILES)
|
|
# CMAKE_REQUIRED_LINK_OPTIONS was introduced in CMake 3.14.
|
|
if(CMAKE_VERSION VERSION_LESS "3.14")
|
|
set(CMAKE_REQUIRED_LINK_OPTIONS "-static")
|
|
else()
|
|
set(CMAKE_REQUIRED_FLAGS "-static")
|
|
endif()
|
|
# Check that the compiler can build a simple application and statically link
|
|
# with libatomic.
|
|
check_c_source_compiles("${CheckLibAtomicCompiles_CODE}"
|
|
HAVE_LIBATOMIC_COMPILES_STATIC)
|
|
else()
|
|
set(HAVE_LIBATOMIC_COMPILES_STATIC
|
|
0
|
|
CACHE INTERNAL "" FORCE)
|
|
endif()
|
|
|
|
unset(CMAKE_REQUIRED_FLAGS)
|
|
unset(CMAKE_REQUIRED_LIBRARIES)
|
|
unset(CMAKE_REQUIRED_LINK_OPTIONS)
|
|
|
|
set(CheckGCCAtomicIntrinsics_CODE
|
|
"
|
|
#include<stddef.h>
|
|
#include<stdint.h>
|
|
int main(void)
|
|
{
|
|
ptrdiff_t x = 0;
|
|
intmax_t y = 0;
|
|
__atomic_add_fetch(&x, 1, __ATOMIC_SEQ_CST);
|
|
__atomic_add_fetch(&y, 1, __ATOMIC_SEQ_CST);
|
|
return __atomic_sub_fetch(&x, 1, __ATOMIC_SEQ_CST)
|
|
+ __atomic_sub_fetch(&y, 1, __ATOMIC_SEQ_CST);
|
|
}
|
|
")
|
|
|
|
set(CMAKE_TRY_COMPILE_TARGET_TYPE EXECUTABLE) # CMake 3.6
|
|
check_c_source_compiles("${CheckGCCAtomicIntrinsics_CODE}"
|
|
HAVE_GCCATOMIC_INTRINSICS)
|
|
|
|
if(NOT HAVE_GCCATOMIC_INTRINSICS AND HAVE_LIBATOMIC)
|
|
set(CMAKE_REQUIRED_LIBRARIES "atomic")
|
|
check_c_source_compiles("${CheckGCCAtomicIntrinsics_CODE}"
|
|
HAVE_GCCATOMIC_INTRINSICS_REQUIRES_LIBATOMIC)
|
|
if(HAVE_GCCATOMIC_INTRINSICS_REQUIRES_LIBATOMIC)
|
|
set(HAVE_GCCATOMIC_INTRINSICS
|
|
1
|
|
CACHE INTERNAL "" FORCE)
|
|
endif()
|
|
endif()
|
|
|
|
endfunction(CheckGCCAtomicIntrinsics)
|