projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 11fdf7f2 TL |
1 | # some platforms do not offer support for atomic primitive for all integer |
| 2 | # types, in that case we need to link against libatomic | |
| 3 | ||
| 4 | include(CheckCXXSourceCompiles) | |
| 5 | include(CMakePushCheckState) | |
| 6 | ||
| 7 | ||
| 8 | function(check_cxx_atomics var) | |
| 9 | set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11") | |
| 10 | check_cxx_source_compiles(" | |
| 11 | #include <atomic> | |
| 12 | #include <cstdint> | |
| 13 | int main() { | |
| 14 | std::atomic<uint8_t> w1; | |
| 15 | std::atomic<uint16_t> w2; | |
| 16 | std::atomic<uint32_t> w4; | |
| 17 | std::atomic<uint64_t> w8; | |
| eafe8130 TL |
18 | #ifdef __s390x__ |
| 19 | // Boost needs 16-byte atomics for tagged pointers. | |
| 20 | std::atomic<unsigned __int128> w16; | |
| 21 | #else | |
| 22 | #define w16 0 | |
| 23 | #endif | |
| 24 | return w1 + w2 + w4 + w8 + w16; | |
| 11fdf7f2 TL |
25 | } |
| 26 | " ${var}) | |
| 27 | endfunction(check_cxx_atomics) | |
| 28 | ||
| 29 | cmake_push_check_state() | |
| 30 | check_cxx_atomics(HAVE_CXX11_ATOMIC) | |
| 31 | cmake_pop_check_state() | |
| 32 | ||
| 33 | if(NOT HAVE_CXX11_ATOMIC) | |
| 34 | cmake_push_check_state() | |
| 35 | set(CMAKE_REQUIRED_LIBRARIES "atomic") | |
| 36 | check_cxx_atomics(HAVE_LIBATOMIC) | |
| 37 | cmake_pop_check_state() | |
| 38 | if(HAVE_LIBATOMIC) | |
| 39 | set(LIBATOMIC_LINK_FLAGS "-Wl,--as-needed -latomic") | |
| 40 | else() | |
| 41 | message(FATAL_ERROR | |
| 42 | "Host compiler ${CMAKE_CXX_COMPILER} requires libatomic, but it is not found") | |
| 43 | endif() | |
| 44 | endif() |