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use cache variables for the CMake standard and extensions settings

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This commit is contained in:
Jordan Williams 2020-02-12 07:44:47 -06:00
parent ced710bb4c
commit ef33c10ba8
1 changed files with 3 additions and 5 deletions
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8
CMakeLists.txt
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@ -16,11 +16,9 @@ option(toml11_TEST_WITH_UBSAN "use LLVM undefined behavior sanitizer" OFF)
include(CheckCXXCompilerFlag)
if("${CMAKE_VERSION}" VERSION_GREATER 3.1)
set(CMAKE_CXX_EXTENSIONS OFF)
if(NOT DEFINED CMAKE_CXX_STANDARD)
set(CMAKE_CXX_STANDARD 11)
endif()
set(CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_STANDARD 11 CACHE STRING "The C++ standard whose features are requested to build all targets.")
set(CMAKE_CXX_STANDARD_REQUIRED ON CACHE BOOL "Boolean describing whether the value of CXX_STANDARD is a requirement.")
set(CMAKE_CXX_EXTENSIONS OFF CACHE BOOL "Boolean specifying whether compiler specific extensions are requested.")
else()
# Manually check for C++11 compiler flag.
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)