[PATCH] D25491: [libcxx] Use C++14 when building libc++ with musl

[Petr Hosek via cfe-commits]

phosek created this revision.
phosek added reviewers: EricWF, mclow.lists.
phosek added a subscriber: cfe-commits.
phosek set the repository for this revision to rL LLVM.
Herald added subscribers: mgorny, beanz.

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


Repository:
  rL LLVM

https://reviews.llvm.org/D25491

Files:
  CMakeLists.txt


Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -331,6 +331,11 @@
   message(FATAL_ERROR "C++11 or greater is required but the compiler does not support ${LIBCXX_STANDARD_VER}")
 endif()
 
+check_flag_supported(-std=c++14)
+if (LIBCXX_HAS_MUSL_LIBC AND LIBCXX_SUPPORTS_STD_EQ_CXX14_FLAG)
+  string(REPLACE "-std=c++11" "-std=c++14" LIBCXX_COMPILE_FLAGS "${LIBCXX_COMPILE_FLAGS}")
+endif()
+
 # On all systems the system c++ standard library headers need to be excluded.
 # MSVC only has -X, which disables all default includes; including the crt.
 # Thus, we do nothing and hope we don't accidentally include any of the C++


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