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[cmake] Use -std=gnu++11 to fix alloca() on NetBSD

Prefer using '-std=gnu++11' over '-std=c++11' when available, as NetBSD
exposes the correct alloca() implementation only with gnu* C/C++
standards.

Differential Revision: https://reviews.llvm.org/D55477
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mgorny committed Dec 11, 2018
1 parent efdf23f commit f41a2feaaaf9082f2713299d53b9232aff0b64ea
Showing with 6 additions and 2 deletions.
  1. +4 −1 openmp/cmake/HandleOpenMPOptions.cmake
  2. +2 −1 openmp/cmake/config-ix.cmake
@@ -13,4 +13,7 @@ if (${OPENMP_ENABLE_WERROR})
append_if(OPENMP_HAVE_WERROR_FLAG "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()

append_if(OPENMP_HAVE_STD_CPP11_FLAG "-std=c++11" CMAKE_CXX_FLAGS)
append_if(OPENMP_HAVE_STD_GNUPP11_FLAG "-std=gnu++11" CMAKE_CXX_FLAGS)
if (NOT OPENMP_HAVE_STD_GNUPP11_FLAG)
append_if(OPENMP_HAVE_STD_CPP11_FLAG "-std=c++11" CMAKE_CXX_FLAGS)
endif()
@@ -3,4 +3,5 @@ include(CheckCXXCompilerFlag)

check_c_compiler_flag(-Werror OPENMP_HAVE_WERROR_FLAG)

check_cxx_compiler_flag(-std=c++11 OPENMP_HAVE_STD_CPP11_FLAG)
check_cxx_compiler_flag(-std=gnu++11 OPENMP_HAVE_STD_GNUPP11_FLAG)
check_cxx_compiler_flag(-std=c++11 OPENMP_HAVE_STD_CPP11_FLAG)

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