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     # FIXME: We can't use this as there is a glibc bug in socket.h
  42     # https://bugzilla.redhat.com/show_bug.cgi?id=2047022
  43     # https://sourceware.org/bugzilla/show_bug.cgi?id=28846
  44     #add_c_compiler_flag("-Werror=strict-overflow" SUPPORTED_COMPILER_FLAGS)
  45     #add_c_compiler_flag("-Wstrict-overflow=2" SUPPORTED_COMPILER_FLAGS)
  46     add_c_compiler_flag("-Wno-format-zero-length" SUPPORTED_COMPILER_FLAGS)
  47
  48     check_c_compiler_flag("-Wformat" REQUIRED_FLAGS_WFORMAT)
  49     if (REQUIRED_FLAGS_WFORMAT)
  50         list(APPEND SUPPORTED_COMPILER_FLAGS "-Wformat")
  51         set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Wformat")
  52     endif()
  53     add_c_compiler_flag("-Wformat-security" SUPPORTED_COMPILER_FLAGS)
  54     add_c_compiler_flag("-Werror=format-security" SUPPORTED_COMPILER_FLAGS)
  55
  56     # Allow zero for a variadic macro argument
  57     string(TOLOWER "${CMAKE_C_COMPILER_ID}" _C_COMPILER_ID)
  58     if ("${_C_COMPILER_ID}" STREQUAL "clang")
  59         add_c_compiler_flag("-Wno-gnu-zero-variadic-macro-arguments" SUPPORTED_COMPILER_FLAGS)
  60     endif()
  61
  62     add_c_compiler_flag("-fno-common" SUPPORTED_COMPILER_FLAGS)
  63
  64     if (CMAKE_BUILD_TYPE)
  65         string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
  66         if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
  67             add_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" SUPPORTED_COMPILER_FLAGS)
  68         endif()
  69     endif()
  70
  71     if (NOT SOLARIS)
  72         check_c_compiler_flag_ssp("-fstack-protector-strong" WITH_STACK_PROTECTOR_STRONG)
  73         if (WITH_STACK_PROTECTOR_STRONG)
  74             list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector-strong")
  75             # This is needed as Solaris has a seperate libssp
  76             if (SOLARIS)
  77                 list(APPEND SUPPORTED_LINKER_FLAGS "-fstack-protector-strong")
  78             endif()
  79         else (WITH_STACK_PROTECTOR_STRONG)
  80             check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
  81             if (WITH_STACK_PROTECTOR)
  82                 list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector")
  83                 # This is needed as Solaris has a seperate libssp
  84                 if (SOLARIS)
  85                     list(APPEND SUPPORTED_LINKER_FLAGS "-fstack-protector")
  86                 endif()
  87             endif()
  88         endif (WITH_STACK_PROTECTOR_STRONG)
  89
  90         check_c_compiler_flag_ssp("-fstack-clash-protection" WITH_STACK_CLASH_PROTECTION)
  91         if (WITH_STACK_CLASH_PROTECTION)
  92             list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-clash-protection")
  93         endif()
  94     endif()
  95
  96     if (PICKY_DEVELOPER)
  97         add_c_compiler_flag("-Wno-error=deprecated-declarations" SUPPORTED_COMPILER_FLAGS)
  98         add_c_compiler_flag("-Wno-error=tautological-compare" SUPPORTED_COMPILER_FLAGS)
  99     endif()
 100
 101     # Unset CMAKE_REQUIRED_FLAGS
 102     unset(CMAKE_REQUIRED_FLAGS)
 103 endif()
 104
 105 if (MSVC)
 106     add_c_compiler_flag("/D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1" SUPPORTED_COMPILER_FLAGS)
 107     add_c_compiler_flag("/D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1" SUPPORTED_COMPILER_FLAGS)
 108     add_c_compiler_flag("/D _CRT_NONSTDC_NO_WARNINGS=1" SUPPORTED_COMPILER_FLAGS)
 109     add_c_compiler_flag("/D _CRT_SECURE_NO_WARNINGS=1" SUPPORTED_COMPILER_FLAGS)
 110 endif()
 111
 112 if (SUPPORTED_COMPILER_FLAGS)
 113     set(DEFAULT_C_COMPILE_FLAGS ${SUPPORTED_COMPILER_FLAGS} CACHE INTERNAL "Default C Compiler Flags" FORCE)
 114 endif()
 115 if (SUPPORTED_LINKER_FLAGS)
 116     set(DEFAULT_LINK_FLAGS ${SUPPORTED_LINKER_FLAGS} CACHE INTERNAL "Default C Linker Flags" FORCE)
 117 endif()