# determine the compiler to use for D programs
# NOTE, a generator may set CMAKE_D_COMPILER before
# loading this file to force a compiler.
# use environment variable DCC first if defined by user, next use 
# the cmake variable CMAKE_GENERATOR_D which can be defined by a generator
# as a default compiler

IF(NOT CMAKE_D_COMPILER)

  # prefer the environment variable DC
  IF($ENV{DC} MATCHES ".+")
    GET_FILENAME_COMPONENT(CMAKE_D_COMPILER_INIT $ENV{DC} PROGRAM PROGRAM_ARGS CMAKE_D_FLAGS_ENV_INIT)
    IF(CMAKE_D_FLAGS_ENV_INIT)
      SET(CMAKE_D_COMPILER_ARG1 "${CMAKE_D_FLAGS_ENV_INIT}" CACHE STRING "First argument to D compiler")
    ENDIF(CMAKE_D_FLAGS_ENV_INIT)
    IF(EXISTS ${CMAKE_D_COMPILER_INIT})
    ELSE(EXISTS ${CMAKE_D_COMPILER_INIT})
      MESSAGE(FATAL_ERROR "Could not find compiler set in environment variable C:\n$ENV{DC}.") 
    ENDIF(EXISTS ${CMAKE_D_COMPILER_INIT})
  ENDIF($ENV{DC} MATCHES ".+")

  # next try prefer the compiler specified by the generator
  IF(CMAKE_GENERATOR_D) 
    IF(NOT CMAKE_D_COMPILER_INIT)
      SET(CMAKE_D_COMPILER_INIT ${CMAKE_GENERATOR_D})
    ENDIF(NOT CMAKE_D_COMPILER_INIT)
  ENDIF(CMAKE_GENERATOR_D)

  # finally list compilers to try
  IF(CMAKE_D_COMPILER_INIT)
    SET(CMAKE_D_COMPILER_LIST ${CMAKE_D_COMPILER_INIT})
  ELSE(CMAKE_D_COMPILER_INIT)
    SET(CMAKE_D_COMPILER_LIST gdc dmd)  
  ENDIF(CMAKE_D_COMPILER_INIT)

  # Find the compiler.
  FIND_PROGRAM(CMAKE_D_COMPILER NAMES ${CMAKE_D_COMPILER_LIST} DOC "C compiler")
  IF(CMAKE_D_COMPILER_INIT AND NOT CMAKE_D_COMPILER)
    SET(CMAKE_D_COMPILER "${CMAKE_D_COMPILER_INIT}" CACHE FILEPATH "C compiler" FORCE)
  ENDIF(CMAKE_D_COMPILER_INIT AND NOT CMAKE_D_COMPILER)
ENDIF(NOT CMAKE_D_COMPILER)
MARK_AS_ADVANCED(CMAKE_D_COMPILER)  
GET_FILENAME_COMPONENT(COMPILER_LOCATION "${CMAKE_D_COMPILER}" PATH)

FIND_PROGRAM(CMAKE_AR NAMES ar PATHS ${COMPILER_LOCATION} )

FIND_PROGRAM(CMAKE_RANLIB NAMES ranlib)
IF(NOT CMAKE_RANLIB)
   SET(CMAKE_RANLIB : CACHE INTERNAL "noop for ranlib")
ENDIF(NOT CMAKE_RANLIB)
MARK_AS_ADVANCED(CMAKE_RANLIB)

# do not test for GNU if the generator is visual studio
IF(${CMAKE_GENERATOR} MATCHES "Visual Studio")
  SET(CMAKE_COMPILER_IS_GDC_RUN 1)
ENDIF(${CMAKE_GENERATOR} MATCHES "Visual Studio") 


IF(NOT CMAKE_COMPILER_IS_GDC_RUN)
  # test to see if the d compiler is gdc
  SET(CMAKE_COMPILER_IS_GDC_RUN 1)
  IF("${CMAKE_D_COMPILER}" MATCHES ".*gdc.*" )
    SET(CMAKE_COMPILER_IS_GDC 1)
    FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
      "Determining if the D compiler is GDC succeeded with "
      "the following output:\n${CMAKE_D_COMPILER}\n\n")
    EXEC_PROGRAM(${CMAKE_D_COMPILER} ARGS "--version" OUTPUT_VARIABLE CMAKE_COMPILER_OUTPUT)
    IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*mingw.*" )
      SET(CMAKE_COMPILER_IS_MINGW 1)
    ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*mingw.*" )
    IF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_CYGWIN.*" )
      SET(CMAKE_COMPILER_IS_CYGWIN 1)
    ENDIF("${CMAKE_COMPILER_OUTPUT}" MATCHES ".*THIS_IS_CYGWIN.*" )
  ELSE("${CMAKE_D_COMPILER}" MATCHES ".*dmd.*" )
    SET(CMAKE_COMPILER_IS_DMD 1)
    FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
      "Determining if the D compiler is DMD succeeded with "
      "the following output:\n${CMAKE_D_COMPILER}\n\n")
  ENDIF("${CMAKE_D_COMPILER}" MATCHES ".*gdc.*" )
ENDIF(NOT CMAKE_COMPILER_IS_GDC_RUN)


# configure variables set in this file for fast reload later on
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeDCompiler.cmake.in 
               "${CMAKE_PLATFORM_ROOT_BIN}/CMakeDCompiler.cmake" IMMEDIATE)
MARK_AS_ADVANCED(CMAKE_AR)

SET(CMAKE_D_COMPILER_ENV_VAR "DC")