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[libcxx] Use C++14 when building libc++ with musl 

musl's pthread implementations use volatile types in their structs
which is not being constexpr in C++11 but is in C++14.

Differential Revision: https://reviews.llvm.org/D25491

llvm-svn: 284950
This commit is contained in:
Petr Hosek 2016-10-23 21:48:27 +00:00
parent d06641d3dc
commit 642b5b27fe
1 changed files with 5 additions and 0 deletions
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5
libcxx/CMakeLists.txt
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@ -325,6 +325,11 @@ remove_flags(-Wno-pedantic -pedantic-errors -pedantic)
# Required flags ==============================================================
set(LIBCXX_STANDARD_VER c++11 CACHE INTERNAL "internal option to change build dialect")
if (LIBCXX_HAS_MUSL_LIBC)
# musl's pthread implementations uses volatile types in their structs which is
# not a constexpr in C++11 but is in C++14, so we use C++14 with musl.
set(LIBCXX_STANDARD_VER c++14 CACHE INTERNAL "internal option to change build dialect")
endif()
add_compile_flags_if_supported(-std=${LIBCXX_STANDARD_VER})
mangle_name("LIBCXX_SUPPORTS_STD_EQ_${LIBCXX_STANDARD_VER}_FLAG" SUPPORTS_DIALECT_NAME)
if (NOT MSVC AND NOT ${SUPPORTS_DIALECT_NAME})