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| author | Vasil Dimov <vd@FreeBSD.org> | 2017-11-11 15:29:42 +0200 |
|---|---|---|
| committer | Vasil Dimov <vd@FreeBSD.org> | 2017-11-11 15:29:42 +0200 |
| commit | 3501ed1fdfc7f34f4c809a7212974078dc217bf3 (patch) | |
| tree | c2fb9ff643aa8ce4a531cc0e3c16e46a7b41d45f | |
| parent | Merge pull request #2694 (diff) | |
| download | monero-3501ed1fdfc7f34f4c809a7212974078dc217bf3.tar.xz | |
Do not require libatomic on FreeBSD
f3e09f36 hooked a dependency on libatomic on 32 bit machines if Clang is
used because compilation failed with:
`std::__atomic_base<unsigned long long>::load(std::memory_order) const':
/usr/bin/../lib/gcc/i686-pc-linux-gnu/6.1.1/../../../../include/c++/6.1.1/bits/atomic_base.h:396:
undefined reference to `__atomic_load_8'
But that does not happen on FreeBSD. The problem is likely that on Linux
Clang tries to use GCC-provided C++11 library. Further,
__atomic_load_8() (for 8-byte integers) is not readily available on 32
bit machines. From https://gcc.gnu.org/wiki/Atomic/GCCMM: "When lock
free instructions are not available (either through hardware or OS
support) atomic operations are left as function calls to be resolved by
a library."
| -rw-r--r-- | CMakeLists.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 637e9c4e6..75d6a1ecd 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -698,7 +698,7 @@ endif() if(ANDROID) set(ATOMIC libatomic.a) endif() -if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND ARCH_WIDTH EQUAL "32" AND NOT IOS) +if(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND ARCH_WIDTH EQUAL "32" AND NOT IOS AND NOT FREEBSD) find_library(ATOMIC atomic) list(APPEND EXTRA_LIBRARIES ${ATOMIC}) endif() |