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[libcxx] Prefer C++14 over C++11 when building libc++experimental.

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Summary:
Currently libc++experimental builds with C++11. This patch changes that to C++14 when supported by the compiler. Although nothing currently requires C++14 the upcoming <experimental/memory_resource> implementation would benefit from it. [1]

Note that libc++.so continues to build with C++11 and is unaffected by this change.

[1] <experimental/memory_resource> provides global resources which must exist for the entire lifetime of the program. In order to ensure that a global resource can be used during program termination there destructors must never be invoked. The only way to do this, while also allowing "constant initialization", is to use a C++14 union.


Reviewers: mclow.lists

Subscribers: pete, cfe-commits

Differential Revision: http://reviews.llvm.org/D19992

llvm-svn: 269070
This commit is contained in:
Eric Fiselier 2016-05-10 16:17:43 +00:00
parent 129fba7fb6
commit a5e201fd55
2 changed files with 12 additions and 1 deletions
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5
libcxx/cmake/Modules/HandleLibcxxFlags.cmake
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@ -35,6 +35,11 @@ macro(remove_flags)
endforeach()
endmacro(remove_flags)
macro(check_flag_supported flag)
mangle_name("${flag}" flagname)
check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG")
endmacro()
# Add a macro definition if condition is true.
macro(define_if condition def)
if (${condition})

8
libcxx/lib/CMakeLists.txt
View File

@ -142,9 +142,15 @@ if (LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY)
file(GLOB LIBCXX_EXPERIMENTAL_SOURCES ../src/experimental/*.cpp)
add_library(cxx_experimental STATIC ${LIBCXX_EXPERIMENTAL_SOURCES})
target_link_libraries(cxx_experimental cxx)
set(experimental_flags "${LIBCXX_COMPILE_FLAGS}")
check_flag_supported(-std=c++14)
if (NOT MSVC AND LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG)
string(REPLACE "-std=c++11" "-std=c++14" experimental_flags "${LIBCXX_COMPILE_FLAGS}")
endif()
set_target_properties(cxx_experimental
PROPERTIES
COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}"
COMPILE_FLAGS "${experimental_flags}"
OUTPUT_NAME "c++experimental"
)
endif()