cmake/modules/CompilerWarnings.cmake

0001 include(CheckCXXCompilerFlag)
0002 include(CheckCCompilerFlag)
0003
0004 macro(check_lang_compiler_flag lang flag variable)
0005
0006     if(${lang} STREQUAL c)
0007         check_c_compiler_flag(${flag} ${variable})
0008     endif(${lang} STREQUAL c)
0009
0010     if(${lang} STREQUAL cxx)
0011         check_cxx_compiler_flag(${flag} ${variable})
0012     endif(${lang} STREQUAL cxx)
0013
0014 endmacro(check_lang_compiler_flag flag variable)
0015
0016 macro(compiler_warnings ret lang werror_by_default desirable_flags undesirable_flags)
0017     set(warning_flags "")
0018     foreach(flag ${desirable_flags})
0019         check_lang_compiler_flag(${lang} -W${flag} ${flag}_${lang}_result)
0020         if(${${flag}_${lang}_result})
0021             set(warning_flags "${warning_flags} -W${flag}")
0022         endif( ${${flag}_${lang}_result} )
0023     endforeach(flag ${desirable_flags})
0024
0025     check_lang_compiler_flag(${lang} -Werror error_${lang}_result)
0026
0027     if(${error_${lang}_result})
0028         set(error_flags "-Werror")
0029     endif(${error_${lang}_result})
0030
0031     set(all_nowarning_flags_supported 1)
0032
0033     foreach(flag ${undesirable_flags})
0034         check_lang_compiler_flag(${lang} -Wno-${flag} ${flag}_${lang}_result)
0035
0036         if(${${flag}_${lang}_result})
0037             set(warning_flags "${warning_flags} -Wno-${flag}")
0038         else(${${flag}_${lang}_result})
0039             set(all_nowarning_flags_supported 0)
0040             break()
0041         endif(${${flag}_${lang}_result})
0042
0043         check_lang_compiler_flag(${lang} -Wno-error=${flag} noerror_${flag}_${lang}_result)
0044
0045         if(${noerror_${flag}_${lang}_result})
0046             set(error_flags "${error_flags} -Wno-error=${flag}")
0047         endif(${noerror_${flag}_${lang}_result})
0048
0049     endforeach(flag ${undesirable_flags})
0050
0051     if(DISABLE_WERROR)
0052         set(enable_werror 0)
0053     else(DISABLE_WERROR)
0054         set(enable_werror 1)
0055     endif(DISABLE_WERROR)
0056
0057     if(${werror_by_default} AND ${enable_werror} AND ${all_nowarning_flags_supported})
0058         set(${ret} "${warning_flags} ${error_flags}")
0059     else(${werror_by_default} AND ${enable_werror} AND ${all_nowarning_flags_supported})
0060         set(${ret} "${warning_flags}")
0061     endif(${werror_by_default} AND ${enable_werror} AND ${all_nowarning_flags_supported})
0062
0063 endmacro(compiler_warnings ret lang werror_by_default desirable_flags undesirable_flags)