CompilerChecks.cmake

   1 include(AddCCompilerFlag)
   2 include(CheckCCompilerFlagSSP)
   3
   4 if (UNIX)
   5     #
   6     # Check for -Werror turned on if possible
   7     #
   8     # This will prevent that compiler flags are detected incorrectly.
   9     #
  10     check_c_compiler_flag("-Werror" REQUIRED_FLAGS_WERROR)
  11     if (REQUIRED_FLAGS_WERROR)
  12         set(CMAKE_REQUIRED_FLAGS "-Werror")
  13
  14         if (PICKY_DEVELOPER)
  15             list(APPEND SUPPORTED_COMPILER_FLAGS "-Werror")
  16         endif()
  17     endif()
  18
  19     add_c_compiler_flag("-std=gnu99" SUPPORTED_COMPILER_FLAGS)
  20     add_c_compiler_flag("-Wpedantic" SUPPORTED_COMPILER_FLAGS)
  21     add_c_compiler_flag("-Wall" SUPPORTED_COMPILER_FLAGS)
  22     add_c_compiler_flag("-Wshadow" SUPPORTED_COMPILER_FLAGS)
  23     add_c_compiler_flag("-Wmissing-prototypes" SUPPORTED_COMPILER_FLAGS)
  24     add_c_compiler_flag("-Wcast-align" SUPPORTED_COMPILER_FLAGS)
  25     #add_c_compiler_flag("-Wcast-qual" SUPPORTED_COMPILER_FLAGS)
  26     add_c_compiler_flag("-Werror=address" SUPPORTED_COMPILER_FLAGS)
  27     add_c_compiler_flag("-Wstrict-prototypes" SUPPORTED_COMPILER_FLAGS)
  28     add_c_compiler_flag("-Werror=strict-prototypes" SUPPORTED_COMPILER_FLAGS)
  29     add_c_compiler_flag("-Wwrite-strings" SUPPORTED_COMPILER_FLAGS)
  30     add_c_compiler_flag("-Werror=write-strings" SUPPORTED_COMPILER_FLAGS)
  31     add_c_compiler_flag("-Werror-implicit-function-declaration" SUPPORTED_COMPILER_FLAGS)
  32     add_c_compiler_flag("-Wpointer-arith" SUPPORTED_COMPILER_FLAGS)
  33     add_c_compiler_flag("-Werror=pointer-arith" SUPPORTED_COMPILER_FLAGS)
  34     add_c_compiler_flag("-Wdeclaration-after-statement" SUPPORTED_COMPILER_FLAGS)
  35     add_c_compiler_flag("-Werror=declaration-after-statement" SUPPORTED_COMPILER_FLAGS)
  36     add_c_compiler_flag("-Wreturn-type" SUPPORTED_COMPILER_FLAGS)
  37     add_c_compiler_flag("-Werror=return-type" SUPPORTED_COMPILER_FLAGS)
  38     add_c_compiler_flag("-Wuninitialized" SUPPORTED_COMPILER_FLAGS)
  39     add_c_compiler_flag("-Werror=uninitialized" SUPPORTED_COMPILER_FLAGS)
  40     add_c_compiler_flag("-Wimplicit-fallthrough" SUPPORTED_COMPILER_FLAGS)
  41     add_c_compiler_flag("-Werror=strict-overflow" SUPPORTED_COMPILER_FLAGS)
  42     add_c_compiler_flag("-Wstrict-overflow=2" SUPPORTED_COMPILER_FLAGS)
  43     add_c_compiler_flag("-Wno-format-zero-length" SUPPORTED_COMPILER_FLAGS)
  44     add_c_compiler_flag("-Wmissing-field-initializers" SUPPORTED_COMPILER_FLAGS)
  45
  46     check_c_compiler_flag("-Wformat" REQUIRED_FLAGS_WFORMAT)
  47     if (REQUIRED_FLAGS_WFORMAT)
  48         list(APPEND SUPPORTED_COMPILER_FLAGS "-Wformat")
  49         set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Wformat")
  50     endif()
  51     add_c_compiler_flag("-Wformat-security" SUPPORTED_COMPILER_FLAGS)
  52     add_c_compiler_flag("-Werror=format-security" SUPPORTED_COMPILER_FLAGS)
  53
  54     # Allow zero for a variadic macro argument
  55     string(TOLOWER "${CMAKE_C_COMPILER_ID}" _C_COMPILER_ID)
  56     if ("${_C_COMPILER_ID}" STREQUAL "clang")
  57         add_c_compiler_flag("-Wno-gnu-zero-variadic-macro-arguments" SUPPORTED_COMPILER_FLAGS)
  58     endif()
  59
  60     add_c_compiler_flag("-fno-common" SUPPORTED_COMPILER_FLAGS)
  61
  62     if (CMAKE_BUILD_TYPE)
  63         string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
  64         if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
  65             add_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" SUPPORTED_COMPILER_FLAGS)
  66         endif()
  67     endif()
  68
  69     check_c_compiler_flag_ssp("-fstack-protector-strong" WITH_STACK_PROTECTOR_STRONG)
  70     if (WITH_STACK_PROTECTOR_STRONG)
  71         list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector-strong")
  72         # This is needed as Solaris has a seperate libssp
  73         if (SOLARIS)
  74             list(APPEND SUPPORTED_LINKER_FLAGS "-fstack-protector-strong")
  75         endif()
  76     else (WITH_STACK_PROTECTOR_STRONG)
  77         check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
  78         if (WITH_STACK_PROTECTOR)
  79             list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector")
  80             # This is needed as Solaris has a seperate libssp
  81             if (SOLARIS)
  82                 list(APPEND SUPPORTED_LINKER_FLAGS "-fstack-protector")
  83             endif()
  84         endif()
  85     endif (WITH_STACK_PROTECTOR_STRONG)
  86
  87     check_c_compiler_flag_ssp("-fstack-clash-protection" WITH_STACK_CLASH_PROTECTION)
  88     if (WITH_STACK_CLASH_PROTECTION)
  89         list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-clash-protection")
  90     endif()
  91
  92     if (PICKY_DEVELOPER)
  93         add_c_compiler_flag("-Wno-error=deprecated-declarations" SUPPORTED_COMPILER_FLAGS)
  94         add_c_compiler_flag("-Wno-error=tautological-compare" SUPPORTED_COMPILER_FLAGS)
  95     endif()
  96
  97     # Unset CMAKE_REQUIRED_FLAGS
  98     unset(CMAKE_REQUIRED_FLAGS)
  99 endif()
 100
 101 if (MSVC)
 102     add_c_compiler_flag("/D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1" SUPPORTED_COMPILER_FLAGS)
 103     add_c_compiler_flag("/D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1" SUPPORTED_COMPILER_FLAGS)
 104     add_c_compiler_flag("/D _CRT_NONSTDC_NO_WARNINGS=1" SUPPORTED_COMPILER_FLAGS)
 105     add_c_compiler_flag("/D _CRT_SECURE_NO_WARNINGS=1" SUPPORTED_COMPILER_FLAGS)
 106 endif()
 107
 108 set(DEFAULT_C_COMPILE_FLAGS ${SUPPORTED_COMPILER_FLAGS} CACHE INTERNAL "Default C Compiler Flags" FORCE)
 109 set(DEFAULT_LINK_FLAGS ${SUPPORTED_LINKER_FLAGS} CACHE INTERNAL "Default C Linker Flags" FORCE)