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Using CMake's check_cxx_compiler_flag to check support for -Wthread-safety.

Browse Source 
Previously used check_cxx_source_compiles to attempt a
build to determine support for clang thread safety checks.

This change is to support static analysis of the leveldb source by
lgtm.com (using Semmle). It failed to build with the following error:

```
[2019-07-04 22:29:58] [build] c++: error: unrecognized command line option ‘-Wthread-safety’; did you mean ‘-fthread-jumps’?
[2019-07-04 22:30:02] [build] make[2]: *** [CMakeFiles/leveldb.dir/build.make:66: CMakeFiles/leveldb.dir/db/builder.cc.o] Error 1
```

PiperOrigin-RevId: 272275528
This commit is contained in:
Chris Mumford 2019-10-01 13:00:35 -07:00 committed by Chris Mumford
parent 45ee61579c
commit 370d532a00
1 changed files with 4 additions and 17 deletions
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21
CMakeLists.txt
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@ -73,25 +73,12 @@ else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
include(CheckCXXSourceCompiles)
# Test whether -Wthread-safety is available. See
# https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
# -Werror is necessary because unknown attributes only generate warnings.
set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
list(APPEND CMAKE_REQUIRED_FLAGS -Werror -Wthread-safety)
check_cxx_source_compiles("
struct __attribute__((lockable)) Lock {
void Acquire() __attribute__((exclusive_lock_function()));
void Release() __attribute__((unlock_function()));
};
struct ThreadSafeType {
Lock lock_;
int data_ __attribute__((guarded_by(lock_)));
};
int main() { return 0; }
" HAVE_CLANG_THREAD_SAFETY)
set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
include(CheckCXXCompilerFlag)
check_cxx_compiler_flag(-Wthread-safety HAVE_CLANG_THREAD_SAFETY)
include(CheckCXXSourceCompiles)
# Test whether C++17 __has_include is available.
check_cxx_source_compiles("