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

[Petr Hosek via cfe-commits]

phosek updated this revision to Diff 74439.
phosek marked an inline comment as done.

Repository:
  rL LLVM

https://reviews.llvm.org/D25491

Files:
  CMakeLists.txt


Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -325,6 +325,11 @@
 
 # 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)
+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})


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