cmake/Compiler/GNU.cmake

   1
   2 #=============================================================================
   3 # Copyright 2002-2009 Kitware, Inc.
   4 #
   5 # Distributed under the OSI-approved BSD License (the "License");
   6 # see accompanying file Copyright.txt for details.
   7 #
   8 # This software is distributed WITHOUT ANY WARRANTY; without even the
   9 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  10 # See the License for more information.
  11 #=============================================================================
  12 # (To distribute this file outside of CMake, substitute the full
  13 #  License text for the above reference.)
  14
  15 # This module is shared by multiple languages; use include blocker.
  16 if(__COMPILER_GNU)
  17   return()
  18 endif()
  19 set(__COMPILER_GNU 1)
  20
  21 macro(__compiler_gnu lang)
  22   # Feature flags.
  23   set(CMAKE_${lang}_VERBOSE_FLAG "-v")
  24   set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
  25   if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 3.4)
  26     set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
  27   endif()
  28   if(NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4.2)
  29     set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
  30   endif()
  31   set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
  32   set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
  33   set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=")
  34
  35   # Older versions of gcc (< 4.5) contain a bug causing them to report a missing
  36   # header file as a warning if depfiles are enabled, causing check_header_file
  37   # tests to always succeed.  Work around this by disabling dependency tracking
  38   # in try_compile mode.
  39   get_property(_IN_TC GLOBAL PROPERTY IN_TRY_COMPILE)
  40   if(NOT _IN_TC OR CMAKE_FORCE_DEPFILES)
  41     # distcc does not transform -o to -MT when invoking the preprocessor
  42     # internally, as it ought to.  Work around this bug by setting -MT here
  43     # even though it isn't strictly necessary.
  44     set(CMAKE_DEPFILE_FLAGS_${lang} "-MMD -MT <OBJECT> -MF <DEPFILE>")
  45   endif()
  46
  47   # Initial configuration flags.
  48   set(CMAKE_${lang}_FLAGS_INIT "")
  49   set(CMAKE_${lang}_FLAGS_DEBUG_INIT "")
  50   set(CMAKE_${lang}_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG")
  51   set(CMAKE_${lang}_FLAGS_RELEASE_INIT "")
  52   set(CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT "-O2 -g -DNDEBUG")
  53   set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
  54   set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
  55   if(NOT APPLE)
  56     set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
  57   endif()
  58 endmacro()