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