90 lines
3.8 KiB
CMake
90 lines
3.8 KiB
CMake
# determine the compiler to use for C programs
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# NOTE, a generator may set CMAKE_C_COMPILER before
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# loading this file to force a compiler.
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# use environment variable CCC first if defined by user, next use
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# the cmake variable CMAKE_GENERATOR_CC which can be defined by a generator
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# as a default compiler
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IF(NOT CMAKE_C_COMPILER)
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SET(CMAKE_CXX_COMPILER_INIT NOTFOUND)
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# prefer the environment variable CC
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IF($ENV{CC} MATCHES ".+")
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GET_FILENAME_COMPONENT(CMAKE_C_COMPILER_INIT $ENV{CC} PROGRAM PROGRAM_ARGS CMAKE_C_FLAGS_ENV_INIT)
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IF(EXISTS ${CMAKE_C_COMPILER_INIT})
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ELSE(EXISTS ${CMAKE_C_COMPILER_INIT})
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MESSAGE(FATAL_ERROR "Could not find compiler set in environment variable CC:\n$ENV{CC}.")
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ENDIF(EXISTS ${CMAKE_C_COMPILER_INIT})
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ENDIF($ENV{CC} MATCHES ".+")
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# next try prefer the compiler specified by the generator
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IF(CMAKE_GENERATOR_CC)
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IF(NOT CMAKE_C_COMPILER_INIT)
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SET(CMAKE_C_COMPILER_INIT ${CMAKE_GENERATOR_CC})
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ENDIF(NOT CMAKE_C_COMPILER_INIT)
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ENDIF(CMAKE_GENERATOR_CC)
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# if no compiler has been specified yet, then look for one
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IF(NOT CMAKE_C_COMPILER_INIT)
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# if not in the envionment then search for the compiler in the path
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SET(CMAKE_C_COMPILER_LIST gcc cc cl bcc xlc)
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FIND_PROGRAM(CMAKE_C_COMPILER_FULLPATH NAMES ${CMAKE_C_COMPILER_LIST} )
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GET_FILENAME_COMPONENT(CMAKE_C_COMPILER_INIT
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${CMAKE_C_COMPILER_FULLPATH} NAME)
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SET(CMAKE_C_COMPILER_FULLPATH "${CMAKE_C_COMPILER_FULLPATH}" CACHE INTERNAL "full path to the compiler cmake found")
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ENDIF(NOT CMAKE_C_COMPILER_INIT)
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SET(CMAKE_C_COMPILER ${CMAKE_C_COMPILER_INIT} CACHE STRING "C compiler")
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ENDIF(NOT CMAKE_C_COMPILER)
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MARK_AS_ADVANCED(CMAKE_C_COMPILER)
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FIND_PROGRAM(CMAKE_AR NAMES ar )
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FIND_PROGRAM(CMAKE_RANLIB NAMES ranlib)
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IF(NOT CMAKE_RANLIB)
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SET(CMAKE_RANLIB : CACHE INTERNAL "noop for ranlib")
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ENDIF(NOT CMAKE_RANLIB)
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MARK_AS_ADVANCED(CMAKE_RANLIB)
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# do not test for GNU if the generator is visual studio
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IF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
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SET(CMAKE_COMPILER_IS_GNUCC_RUN 1)
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ENDIF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
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IF(NOT CMAKE_COMPILER_IS_GNUCC_RUN)
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# test to see if the c compiler is gnu
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IF(CMAKE_C_FLAGS)
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SET(CMAKE_BOOT_C_FLAGS ${CMAKE_C_FLAGS})
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ELSE(CMAKE_C_FLAGS)
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SET(CMAKE_BOOT_C_FLAGS $ENV{CFLAGS})
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ENDIF(CMAKE_C_FLAGS)
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EXEC_PROGRAM(${CMAKE_C_COMPILER} ARGS ${CMAKE_BOOT_C_FLAGS} -E "\"${CMAKE_ROOT}/Modules/CMakeTestGNU.c\"" OUTPUT_VARIABLE CMAKE_COMPILER_OUTPUT RETURN_VALUE CMAKE_COMPILER_RETURN)
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SET(CMAKE_COMPILER_IS_GNUCC_RUN 1)
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IF(NOT CMAKE_COMPILER_RETURN)
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IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
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SET(CMAKE_COMPILER_IS_GNUCC 1)
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FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log
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"Determining if the C compiler is GNU succeeded with "
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"the following output:\n${CMAKE_COMPILER_OUTPUT}\n\n")
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ELSE("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
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FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log
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"Determining if the C compiler is GNU failed with "
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"the following output:\n${CMAKE_COMPILER_OUTPUT}\n\n")
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ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
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IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_MINGW.*" )
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SET(CMAKE_COMPILER_IS_MINGW 1)
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ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_MINGW.*" )
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IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_CYGWIN.*" )
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SET(CMAKE_COMPILER_IS_CYGWIN 1)
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ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_CYGWIN.*" )
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ENDIF(NOT CMAKE_COMPILER_RETURN)
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ENDIF(NOT CMAKE_COMPILER_IS_GNUCC_RUN)
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# configure variables set in this file for fast reload later on
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CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
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${CMAKE_BINARY_DIR}/CMakeCCompiler.cmake IMMEDIATE)
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MARK_AS_ADVANCED(CMAKE_AR)
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SET(CMAKE_C_COMPILER_ENV_VAR "CC")
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