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Use libc++ runtime if necessary for C++11 compliance

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If we are using the Apple toolchain on MacOS X, we must use the
newer runtime and not the old GCC 4.2 fork, in order to get the
C++11 library features (such as std::shared_ptr).
This commit is contained in:
Roland Kaufmann
2013-08-25 10:49:09 +02:00
parent e8ec217c52
commit b78deb0982
3 changed files with 23 additions and 2 deletions
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20
cmake/Modules/FindCXX11Features.cmake
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@@ -43,6 +43,26 @@ else()
endif(CXX_FLAG_CXX0X)
endif(CXX_FLAG_CXX11)
# if we are building with an Apple toolchain in MacOS X,
# we cannot use the old GCC 4.2 fork, but must use the
# new runtime library
set (CXX_STDLIB_FLAGS)
string (TOUPPER "${CMAKE_CXX_COMPILER_ID}" _comp_id)
if (APPLE AND (_comp_id MATCHES "CLANG"))
CHECK_CXX_ACCEPTS_FLAG ("-stdlib=libc++" CXX_FLAG_STDLIB_LIBCXX)
if (CXX_FLAG_STDLIB_LIBCXX)
add_options (CXX ALL_BUILDS "-stdlib=libc++")
set (CXX_STDLIB_FLAGS "-stdlib=libc++")
endif (CXX_FLAG_STDLIB_LIBCXX)
endif (APPLE AND (_comp_id MATCHES "CLANG"))
# to format the command-line options pretty, we have an optional space
if (CXX_STD0X_FLAGS AND CXX_STDLIB_FLAGS)
set (CXX_SPACE " ")
else (CXX_STD0X_FLAGS AND CXX_STDLIB_FLAGS)
set (CXX_SPACE)
endif (CXX_STD0X_FLAGS AND CXX_STDLIB_FLAGS)
# perform tests
include(CheckCXXSourceCompiles)