cmake/Modules/DefineCompilerFlags.cmake

   1 # define system dependent compiler flags
   2
   3 include(CheckCCompilerFlag)
   4 include(CheckCCompilerFlagSSP)
   5
   6 if (UNIX AND NOT WIN32)
   7     #
   8     # Define GNUCC compiler flags
   9     #
  10     if (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
  11
  12         # add -Wconversion ?
  13         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -pedantic -pedantic-errors")
  14         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Wshadow -Wmissing-prototypes -Wdeclaration-after-statement")
  15         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wunused -Wfloat-equal -Wpointer-arith -Wwrite-strings -Wformat-security")
  16         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-format-attribute")
  17
  18         # with -fPIC
  19         check_c_compiler_flag("-fPIC" WITH_FPIC)
  20         if (WITH_FPIC)
  21             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
  22         endif (WITH_FPIC)
  23
  24         check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
  25         if (WITH_STACK_PROTECTOR)
  26             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstack-protector")
  27         endif (WITH_STACK_PROTECTOR)
  28
  29         if (CMAKE_BUILD_TYPE)
  30             string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
  31             if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
  32                 check_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" WITH_FORTIFY_SOURCE)
  33                 if (WITH_FORTIFY_SOURCE)
  34                     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wp,-D_FORTIFY_SOURCE=2")
  35                 endif (WITH_FORTIFY_SOURCE)
  36             endif()
  37         endif()
  38     endif (${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
  39
  40     #
  41     # Check for large filesystem support
  42     #
  43     if (CMAKE_SIZEOF_VOID_P MATCHES "8")
  44         # with large file support
  45         execute_process(
  46             COMMAND
  47                 getconf LFS64_CFLAGS
  48             OUTPUT_VARIABLE
  49                 _lfs_CFLAGS
  50             ERROR_QUIET
  51             OUTPUT_STRIP_TRAILING_WHITESPACE
  52         )
  53     else (CMAKE_SIZEOF_VOID_P MATCHES "8")
  54         # with large file support
  55         execute_process(
  56             COMMAND
  57                 getconf LFS_CFLAGS
  58             OUTPUT_VARIABLE
  59                 _lfs_CFLAGS
  60             ERROR_QUIET
  61             OUTPUT_STRIP_TRAILING_WHITESPACE
  62         )
  63     endif (CMAKE_SIZEOF_VOID_P MATCHES "8")
  64     if (_lfs_CFLAGS)
  65         string(REGEX REPLACE "[\r\n]" " " "${_lfs_CFLAGS}" "${${_lfs_CFLAGS}}")
  66         set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_lfs_CFLAGS}")
  67     endif (_lfs_CFLAGS)
  68
  69 endif (UNIX AND NOT WIN32)
  70
  71 if (MSVC)
  72     # Use secure functions by defaualt and suppress warnings about
  73     #"deprecated" functions
  74     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1")
  75     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1")
  76     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /D _CRT_NONSTDC_NO_WARNINGS=1 /D _CRT_SECURE_NO_WARNINGS=1")
  77 endif (MSVC)