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# Copyright (c) 2020, 2025, Oracle and/or its affiliates.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2.0,
# as published by the Free Software Foundation.
#
# This program is designed to work with certain software (including
# but not limited to OpenSSL) that is licensed under separate terms,
# as designated in a particular file or component or in included license
# documentation. The authors of MySQL hereby grant you an additional
# permission to link the program and your derivative works with the
# separately licensed software that they have either included with
# the program or referenced in the documentation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License, version 2.0, for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# Output from this file:
# JAVA_HOME The value of JAVA HOME (in cache)
# JAVA_EXECUTABLE The java executable (in cache)
# JAVAC_EXECUTABLE The javac executable (in cache)
# JAVA_VERSION The found java version (in cache)
# JAVA_FOUND TRUE if java found (in cache scope)
# NOTE: This module produces another set of variables than FindJava
# (which is invoked if you do FIND_PACKAGE(java)).
#
# TODO: Merge this file and cmake/java.cmake into one that is suitable
# for all Java usage when building mysql.
## Local function to check a Java binary for version number.
FUNCTION(CHECK_JAVA_VERSION _exec_path _wanted_version
_found_required_java _found_java_version)
IF(NOT _exec_path)
RETURN()
ENDIF()
MESSAGE(STATUS "Checking java version for ${_exec_path}")
EXECUTE_PROCESS(COMMAND ${_exec_path} -version
OUTPUT_VARIABLE _vout
ERROR_VARIABLE _vout)
## Assumes first found integers are version. This is correct for all
## relevant java versions today.
STRING(REGEX MATCH "[0-9]+.[0-9]+.[0-9]+"
_found_version "${_vout}")
IF ("${_found_version}" VERSION_LESS ${_wanted_version})
## Not usable
ELSE()
SET(${_found_required_java} "TRUE" PARENT_SCOPE)
SET(${_found_java_version} ${_found_version} PARENT_SCOPE)
ENDIF()
ENDFUNCTION()
# Function that will ensure that JAVA_HOME is set to a Java version we
# can use.
FUNCTION(CHECK_JAVA_HOME _wanted_version)
IF (JAVA_HOME_OK)
MESSAGE(STATUS "Using cached java: ${JAVA_EXECUTABLE} (${JAVA_VERSION})")
RETURN()
ENDIF()
## Store major version for warning text.
STRING(REGEX MATCH "[0-9]+"
_major_version "${_wanted_version}")
SET(JAVA_MAJOR_VERSION "${_major_version}" CACHE INTERNAL "Major version of Java")
IF(DEFINED ENV{JAVA_HOME})
IF (WIN32)
SET(_java_exec "$ENV{JAVA_HOME}/bin/java.exe")
ELSE()
SET(_java_exec "$ENV{JAVA_HOME}/bin/java")
ENDIF()
IF (EXISTS "${_java_exec}")
CHECK_JAVA_VERSION(${_java_exec} ${_wanted_version}
_found_required_java _found_java_version)
IF (NOT _found_required_java)
MESSAGE(WARNING "JAVA_HOME does not point to Java ${_wanted_version} or higher")
ENDIF()
ELSE()
MESSAGE(WARNING "JAVA_HOME=$ENV{JAVA_HOME} is not a proper java home")
ENDIF()
ELSE()
MESSAGE(WARNING "JAVA_HOME must be set")
ENDIF()
## Wrap up by setting the results
IF (_found_required_java)
IF (WIN32)
SET(_javac_exec "$ENV{JAVA_HOME}/bin/javac.exe")
ELSE()
SET(_javac_exec "$ENV{JAVA_HOME}/bin/javac")
ENDIF()
## The check that we also have a compiler
IF (EXISTS "${_javac_exec}")
SET(JAVA_EXECUTABLE "${_java_exec}" CACHE FILEPATH "Java program")
SET(JAVAC_EXECUTABLE "${_javac_exec}" CACHE FILEPATH "Java compiler")
SET(JAVA_HOME_OK "TRUE" CACHE BOOL "")
SET(JAVA_VERSION "${_found_java_version}" CACHE STRING "Java version")
SET(JAVA_HOME "$ENV{JAVA_HOME}" CACHE FILEPATH "Value of JAVA_HOME env")
MESSAGE(STATUS "Found java: ${JAVA_EXECUTABLE} (${_found_java_version})")
ELSE()
MESSAGE(WARNING "Found ${JAVA_EXECUTABLE} (${_found_java_version}) but no java compiler")
ENDIF()
ENDIF()
ENDFUNCTION()
FUNCTION(WARN_NOT_USABLE_JAVA_HOME)
IF (NOT JAVA_HOME_OK)
MESSAGE(WARNING "JAVA_HOME was not pointing to a Java ${JAVA_MAJOR_VERSION} directory.\n"
" Set JAVA_HOME to point to a Java ${JAVA_MAJOR_VERSION} directory.\n"
" On lab computers: /usr/global/java/jdk-${JAVA_MAJOR_VERSION}.\n"
" On Ubuntu/Oracle Linux/RedHat : /usr/lib/jvm/some-path-to-jdk-${JAVA_MAJOR_VERSION}.\n"
" If you don't have Java ${JAVA_MAJOR_VERSION}, install a Java ${JAVA_MAJOR_VERSION} package first:\n"
" RHEL/Fedora/Oracle linux : yum install java-${JAVA_MAJOR_VERSION}-openjdk-devel\n"
" Debian/Ubuntu: apt install openjdk-${JAVA_MAJOR_VERSION}-jdk-headless\n"
" SLES/openSUSE: zypper install java-${JAVA_MAJOR_VERSION}-openjdk-devel\n"
" or download from https://www.oracle.com/java/technologies/javase-jdk${JAVA_MAJOR_VERSION}-downloads.html and follow instructions")
ENDIF()
ENDFUNCTION()
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