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CMake: don't recheck compile flags every time

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Doesn't cause a problem when embedded within a larger project, but is
annoying.
This commit is contained in:
Michael Maltese
2017-04-20 15:54:17 -07:00
parent 554a13dd4b
commit 377401f161
1 changed files with 8 additions and 7 deletions
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15
build/cmake/CMakeModules/AddZstdCompilationFlags.cmake
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@ -2,20 +2,21 @@ include(CheckCXXCompilerFlag)
include(CheckCCompilerFlag)
function(EnableCompilerFlag _flag _C _CXX)
message("Checking flag ${_flag}")
string(REGEX REPLACE "\\+" "PLUS" varname "${_flag}")
string(REGEX REPLACE "[^A-Za-z0-9]+" "_" varname "${varname}")
string(REGEX REPLACE "^_+" "" varname "${varname}")
string(TOUPPER "${varname}" varname)
if (_C)
CHECK_C_COMPILER_FLAG(${_flag} C_FLAG)
if (C_FLAG)
CHECK_C_COMPILER_FLAG(${_flag} C_FLAG_${varname})
if (C_FLAG_${varname})
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_flag}" CACHE INTERNAL "C Flags")
endif ()
unset(C_FLAG CACHE)
endif ()
if (_CXX)
CHECK_CXX_COMPILER_FLAG(${_flag} CXX_FLAG)
if (CXX_FLAG)
CHECK_CXX_COMPILER_FLAG(${_flag} CXX_FLAG_${varname})
if (CXX_FLAG_${varname})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${_flag}" CACHE INTERNAL "CXX Flags")
endif ()
unset(CXX_FLAG CACHE)
endif ()
endfunction()