CMake/Modules/CMakeDetermineJavaCompiler.cmake

# determine the compiler to use for Java programs
# NOTE, a generator may set CMAKE_JAVA_COMPILER before
# loading this file to force a compiler.

IF(NOT CMAKE_JAVA_COMPILER)
  # prefer the environment variable CC
  IF($ENV{JAVA_COMPILER} MATCHES ".+")
    GET_FILENAME_COMPONENT(CMAKE_JAVA_COMPILER_INIT $ENV{JAVA_COMPILER} PROGRAM PROGRAM_ARGS CMAKE_JAVA_FLAGS_ENV_INIT)
    IF(EXISTS ${CMAKE_JAVA_COMPILER_INIT})
    ELSE(EXISTS ${CMAKE_JAVA_COMPILER_INIT})
      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable JAVA_COMPILER:\n$ENV{JAVA_COMPILER}.") 
    ENDIF(EXISTS ${CMAKE_JAVA_COMPILER_INIT})
  ENDIF($ENV{JAVA_COMPILER} MATCHES ".+")

  IF($ENV{JAVA_RUNTIME} MATCHES ".+")
    GET_FILENAME_COMPONENT(CMAKE_JAVA_RUNTIME_INIT $ENV{JAVA_RUNTIME} PROGRAM PROGRAM_ARGS CMAKE_JAVA_FLAGS_ENV_INIT)
    IF(EXISTS ${CMAKE_JAVA_RUNTIME_INIT})
    ELSE(EXISTS ${CMAKE_JAVA_RUNTIME_INIT})
      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable JAVA_RUNTIME:\n$ENV{JAVA_RUNTIME}.") 
    ENDIF(EXISTS ${CMAKE_JAVA_RUNTIME_INIT})
  ENDIF($ENV{JAVA_RUNTIME} MATCHES ".+")

  IF($ENV{JAVA_ARCHIVE} MATCHES ".+")
    GET_FILENAME_COMPONENT(CMAKE_JAVA_ARCHIVE_INIT $ENV{JAVA_ARCHIVE} PROGRAM PROGRAM_ARGS CMAKE_JAVA_FLAGS_ENV_INIT)
    IF(EXISTS ${CMAKE_JAVA_ARCHIVE_INIT})
    ELSE(EXISTS ${CMAKE_JAVA_ARCHIVE_INIT})
      MESSAGE(SEND_ERROR "Could not find compiler set in environment variable JAVA_ARCHIVE:\n$ENV{JAVA_ARCHIVE}.") 
    ENDIF(EXISTS ${CMAKE_JAVA_ARCHIVE_INIT})
  ENDIF($ENV{JAVA_ARCHIVE} MATCHES ".+")

  SET(JAVA_BIN_PATH
    /usr/bin
    /usr/lib/java/bin
    /usr/share/java/bin
    /usr/local/bin
    /usr/local/java/bin
    "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.4;JavaHome]/bin"
    "[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.3;JavaHome]/bin"
    )
  # if no compiler has been specified yet, then look for one
  IF(CMAKE_JAVA_COMPILER_INIT)
    SET(CMAKE_JAVA_COMPILER ${CMAKE_JAVA_COMPILER_INIT} CACHE PATH "Java Compiler")
  ELSE(CMAKE_JAVA_COMPILER_INIT)
    FIND_PROGRAM(CMAKE_JAVA_COMPILER
      NAMES javac
      PATHS ${JAVA_BIN_PATH}
    )    
  ENDIF(CMAKE_JAVA_COMPILER_INIT)

  # if no runtime has been specified yet, then look for one
  IF(CMAKE_JAVA_RUNTIME_INIT)
    SET(CMAKE_JAVA_RUNTIME ${CMAKE_JAVA_RUNTIME_INIT} CACHE PATH "Java Compiler")
  ELSE(CMAKE_JAVA_RUNTIME_INIT)
    FIND_PROGRAM(CMAKE_JAVA_RUNTIME
      NAMES java
      PATHS ${JAVA_BIN_PATH}
    )    
  ENDIF(CMAKE_JAVA_RUNTIME_INIT)

  # if no archive has been specified yet, then look for one
  IF(CMAKE_JAVA_ARCHIVE_INIT)
    SET(CMAKE_JAVA_ARCHIVE ${CMAKE_JAVA_ARCHIVE_INIT} CACHE PATH "Java Compiler")
  ELSE(CMAKE_JAVA_ARCHIVE_INIT)
    FIND_PROGRAM(CMAKE_JAVA_ARCHIVE
      NAMES jar
      PATHS ${JAVA_BIN_PATH}
    )    
  ENDIF(CMAKE_JAVA_ARCHIVE_INIT)
ENDIF(NOT CMAKE_JAVA_COMPILER)
MARK_AS_ADVANCED(CMAKE_JAVA_COMPILER)  

# configure variables set in this file for fast reload later on
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeJavaCompiler.cmake.in 
               ${PROJECT_BINARY_DIR}/CMakeJavaCompiler.cmake IMMEDIATE @ONLY)
MARK_AS_ADVANCED(CMAKE_AR CMAKE_JAVA_COMPILER_FULLPATH)