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# determine the compiler to use for C++ programs
# NOTE, a generator may set CMAKE_CXX_COMPILER before
# loading this file to force a compiler.
# use environment variable CXX first if defined by user, next use
# the cmake variable CMAKE_GENERATOR_CXX which can be defined by a generator
# as a default compiler
IF(NOT CMAKE_CXX_COMPILER)
SET(CMAKE_CXX_COMPILER_INIT NOTFOUND)
# prefer the environment variable CXX
IF($ENV{CXX} MATCHES ".+")
GET_FILENAME_COMPONENT(CMAKE_CXX_COMPILER_INIT $ENV{CXX} PROGRAM PROGRAM_ARGS CMAKE_CXX_FLAGS_ENV_INIT)
IF(EXISTS ${CMAKE_CXX_COMPILER_INIT})
ELSE(EXISTS ${CMAKE_CXX_COMPILER_INIT})
MESSAGE(SEND_ERROR "Could not find compiler set in environment variable CXX:\n$ENV{CXX}.\n${CMAKE_CXX_COMPILER_INIT}")
ENDIF(EXISTS ${CMAKE_CXX_COMPILER_INIT})
ENDIF($ENV{CXX} MATCHES ".+")
# next prefer the generator specified compiler
IF(CMAKE_GENERATOR_CXX)
IF(NOT CMAKE_CXX_COMPILER_INIT)
SET(CMAKE_CXX_COMPILER_INIT ${CMAKE_GENERATOR_CXX})
ENDIF(NOT CMAKE_CXX_COMPILER_INIT)
ENDIF(CMAKE_GENERATOR_CXX)
# if no compiler has been found yet, then try to find one
IF(NOT CMAKE_CXX_COMPILER_INIT)
# if not in the envionment then search for the compiler in the path
SET(CMAKE_CXX_COMPILER_LIST c++ g++ CC aCC cl bcc xlC)
FIND_PROGRAM(CMAKE_CXX_COMPILER_FULLPATH NAMES ${CMAKE_CXX_COMPILER_LIST})
GET_FILENAME_COMPONENT(CMAKE_CXX_COMPILER_INIT
${CMAKE_CXX_COMPILER_FULLPATH} NAME)
ENDIF(NOT CMAKE_CXX_COMPILER_INIT)
SET(CMAKE_CXX_COMPILER ${CMAKE_CXX_COMPILER_INIT}
CACHE STRING "C++ compiler")
ENDIF(NOT CMAKE_CXX_COMPILER)
MARK_AS_ADVANCED(CMAKE_CXX_COMPILER)
# test to see if the cxx compiler is gnu
EXEC_PROGRAM(${CMAKE_CXX_COMPILER} ARGS -E ${CMAKE_ROOT}/Modules/CMakeTestGNU.c OUTPUT_VARIABLE CMAKE_COMPILER_OUTPUT RETURN_VALUE CMAKE_COMPILER_RETURN)
IF(NOT CMAKE_COMPILER_RETURN)
IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
SET(CMAKE_COMPILER_IS_GNUCXX 1)
ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_GNU.*" )
ENDIF(NOT CMAKE_COMPILER_RETURN)
# configure all variables set in this file
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
${CMAKE_BINARY_DIR}/CMakeCXXCompiler.cmake IMMEDIATE)
MARK_AS_ADVANCED(CMAKE_CXX_COMPILER_FULLPATH)
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