CMake/Modules/CMakeDetermineJavaCompiler....

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# determine the compiler to use for Java programs
# NOTE, a generator may set CMAKE_Java_COMPILER before
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# loading this file to force a compiler.
IF(NOT CMAKE_Java_COMPILER)
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# 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(CMAKE_Java_FLAGS_ENV_INIT)
SET(CMAKE_Java_COMPILER_ARG1 ${CMAKE_Java_FLAGS_ENV_INIT} CACHE STRING "First argument to Java compiler")
ENDIF(CMAKE_Java_FLAGS_ENV_INIT)
IF(EXISTS ${CMAKE_Java_COMPILER_INIT})
ELSE(EXISTS ${CMAKE_Java_COMPILER_INIT})
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MESSAGE(SEND_ERROR "Could not find compiler set in environment variable JAVA_COMPILER:\n$ENV{JAVA_COMPILER}.")
ENDIF(EXISTS ${CMAKE_Java_COMPILER_INIT})
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ENDIF($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 ${CMAKE_Java_RUNTIME_INIT})
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MESSAGE(SEND_ERROR "Could not find compiler set in environment variable JAVA_RUNTIME:\n$ENV{JAVA_RUNTIME}.")
ENDIF(EXISTS ${CMAKE_Java_RUNTIME_INIT})
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ENDIF($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 ${CMAKE_Java_ARCHIVE_INIT})
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MESSAGE(SEND_ERROR "Could not find compiler set in environment variable JAVA_ARCHIVE:\n$ENV{JAVA_ARCHIVE}.")
ENDIF(EXISTS ${CMAKE_Java_ARCHIVE_INIT})
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ENDIF($ENV{JAVA_ARCHIVE} MATCHES ".+")
SET(Java_BIN_PATH
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\2.0;JavaHome]/bin"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.9;JavaHome]/bin"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.8;JavaHome]/bin"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.7;JavaHome]/bin"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.6;JavaHome]/bin"
"[HKEY_LOCAL_MACHINE\\SOFTWARE\\JavaSoft\\Java Development Kit\\1.5;JavaHome]/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"
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/usr/bin
/usr/lib/java/bin
/usr/share/java/bin
/usr/local/bin
/usr/local/java/bin
/usr/java/j2sdk1.4.2_04
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)
# 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
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NAMES javac
PATHS ${Java_BIN_PATH}
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)
ENDIF(CMAKE_Java_COMPILER_INIT)
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# 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
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NAMES java
PATHS ${Java_BIN_PATH}
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)
ENDIF(CMAKE_Java_RUNTIME_INIT)
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# 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
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NAMES jar
PATHS ${Java_BIN_PATH}
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)
ENDIF(CMAKE_Java_ARCHIVE_INIT)
ENDIF(NOT CMAKE_Java_COMPILER)
MARK_AS_ADVANCED(CMAKE_Java_COMPILER)
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# configure variables set in this file for fast reload later on
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeJavaCompiler.cmake.in
${CMAKE_BINARY_DIR}/CMakeJavaCompiler.cmake IMMEDIATE @ONLY)
MARK_AS_ADVANCED(CMAKE_AR CMAKE_Java_COMPILER_FULLPATH)
SET(CMAKE_Java_COMPILER_ENV_VAR "JAVA_COMPILER")