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include(CheckCXXCompilerFlag)
include(CheckCCompilerFlag)
macro(check_lang_compiler_flag lang flag variable)
if(${lang} STREQUAL c)
check_c_compiler_flag(${flag} ${variable})
endif(${lang} STREQUAL c)
if(${lang} STREQUAL cxx)
check_cxx_compiler_flag(${flag} ${variable})
endif(${lang} STREQUAL cxx)
endmacro(check_lang_compiler_flag flag variable)
macro(compiler_warnings ret lang werror_by_default desirable_flags undesirable_flags)
set(warning_flags "")
foreach(flag ${desirable_flags})
check_lang_compiler_flag(${lang} -W${flag} ${flag}_${lang}_result)
if(${${flag}_${lang}_result})
set(warning_flags "${warning_flags} -W${flag}")
endif( ${${flag}_${lang}_result} )
endforeach(flag ${desirable_flags})
check_lang_compiler_flag(${lang} -Werror error_${lang}_result)
if(${error_${lang}_result})
set(error_flags "-Werror")
endif(${error_${lang}_result})
set(all_nowarning_flags_supported 1)
foreach(flag ${undesirable_flags})
check_lang_compiler_flag(${lang} -Wno-${flag} ${flag}_${lang}_result)
if(${${flag}_${lang}_result})
set(warning_flags "${warning_flags} -Wno-${flag}")
else(${${flag}_${lang}_result})
set(all_nowarning_flags_supported 0)
break()
endif(${${flag}_${lang}_result})
check_lang_compiler_flag(${lang} -Wno-error=${flag} noerror_${flag}_${lang}_result)
if(${noerror_${flag}_${lang}_result})
set(error_flags "${error_flags} -Wno-error=${flag}")
endif(${noerror_${flag}_${lang}_result})
endforeach(flag ${undesirable_flags})
if(${DISABLE_WERROR} STREQUAL ON)
set(enable_werror 0)
else(${DISABLE_WERROR} STREQUAL ON)
set(enable_werror 1)
endif(${DISABLE_WERROR} STREQUAL ON)
if(${werror_by_default} AND ${enable_werror} AND ${all_nowarning_flags_supported})
set(${ret} "${warning_flags} ${error_flags}")
else(${werror_by_default} AND ${enable_werror} AND ${all_nowarning_flags_supported})
set(${ret} "${warning_flags}")
endif(${werror_by_default} AND ${enable_werror} AND ${all_nowarning_flags_supported})
endmacro(compiler_warnings ret lang werror_by_default desirable_flags undesirable_flags)
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