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Clang: only use libc++ if the compiler can produce a working executable.

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This commit is contained in:
Wenzel Jakob
2017-08-23 21:49:18 +02:00
parent 25dce856e8
commit 4c6c70969e
1 changed files with 22 additions and 5 deletions
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CMakeLists.txt
+22 -5
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@@ -1,7 +1,8 @@
cmake_minimum_required (VERSION 2.8.12 FATAL_ERROR)
project (tbb CXX)
include (CheckCXXCompilerFlag)
include(CheckCXXCompilerFlag)
include(CheckCXXSourceRuns)
if(POLICY CMP0058)
cmake_policy(SET CMP0058 NEW)
@@ -61,10 +62,26 @@ if (APPLE)
set(CMAKE_CXX_ARCHIVE_FINISH "<CMAKE_RANLIB> -no_warning_for_no_symbols -c <TARGET>")
endif()
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
# Always use libc++ on Clang
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -D_LIBCPP_VERSION")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -lc++abi")
macro(CHECK_CXX_COMPILER_AND_LINKER_FLAGS _RESULT _CXX_FLAGS _LINKER_FLAGS)
set(CMAKE_REQUIRED_FLAGS ${_CXX_FLAGS})
set(CMAKE_REQUIRED_LIBRARIES ${_LINKER_FLAGS})
set(CMAKE_REQUIRED_QUIET TRUE)
check_cxx_source_runs("#include <iostream>\nint main(int argc, char **argv) { std::cout << \"test\"; return 0; }" ${_RESULT})
set(CMAKE_REQUIRED_FLAGS "")
set(CMAKE_REQUIRED_LIBRARIES "")
endmacro()
# Prefer libc++ in conjunction with Clang
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang" AND NOT CMAKE_CXX_FLAGS MATCHES "-stdlib=libc\\+\\+")
CHECK_CXX_COMPILER_AND_LINKER_FLAGS(HAS_LIBCPP "-stdlib=libc++" "-stdlib=libc++")
if (HAS_LIBCPP)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -D_LIBCPP_VERSION")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -stdlib=libc++")
message(STATUS "TBB: using libc++.")
else()
message(STATUS "TBB: NOT using libc++.")
endif()
endif()
if (UNIX)