Paradoxically, building OpenJDK requires a pre-existing JDK. This is called the "boot JDK". The boot JDK does not have to be OpenJDK, though. If you are porting OpenJDK to a new platform, chances are that there already exists another JDK for that platform that is usable as boot JDK.
-
The rule of thumb is that the boot JDK for building JDK major version N should be an JDK of major version N-1, so for building JDK 9 a JDK 8 would be suitable as boot JDK. However, OpenJDK should be able to "build itself", so an up-to-date build of the current OpenJDK source is an acceptable alternative. If you are following the N-1 rule, make sure you got the latest update version, since JDK 8 GA might not be able to build JDK 9 on all platforms.
+
The rule of thumb is that the boot JDK for building JDK major version N should be a JDK of major version N-1, so for building JDK 9 a JDK 8 would be suitable as boot JDK. However, OpenJDK should be able to "build itself", so an up-to-date build of the current OpenJDK source is an acceptable alternative. If you are following the N-1 rule, make sure you've got the latest update version, since JDK 8 GA might not be able to build JDK 9 on all platforms.
+
Early in the release cycle, version N-1 may not yet have been released. In that case, the preferred boot JDK will be version N-2 until version N-1 is available.
If the Boot JDK is not automatically detected, or the wrong JDK is picked, use --with-boot-jdk to point to the JDK to use.
-
JDK 8 on Linux
-
On apt-based distros (like Debian and Ubuntu), sudo apt-get install openjdk-8-jdk is typically enough to install OpenJDK 8. On rpm-based distros (like Fedora and Red Hat), try sudo yum install java-1.8.0-openjdk-devel.
-
JDK 8 on Windows
-
No pre-compiled binaries of OpenJDK 8 are readily available for Windows at the time of writing. An alternative is to download the Oracle JDK. Another is the Adopt OpenJDK Project, which publishes experimental prebuilt binaries for Windows.
-
JDK 8 on macOS
-
No pre-compiled binaries of OpenJDK 8 are readily available for macOS at the time of writing. An alternative is to download the Oracle JDK, or to install it using brew cask install java. Another option is the Adopt OpenJDK Project, which publishes experimental prebuilt binaries for macOS.
-
JDK 8 on AIX
-
No pre-compiled binaries of OpenJDK 8 are readily available for AIX at the time of writing. A starting point for working with OpenJDK on AIX is the PowerPC/AIX Port Project.
+
Getting JDK binaries
+
OpenJDK binaries for Linux, Windows and macOS can be downloaded from jdk.java.net. An alternative is to download the Oracle JDK. Another is the Adopt OpenJDK Project, which publishes experimental prebuilt binaries for various platforms.
+
On Linux you can also get OpenJDK from the Linux distribution. On apt-based distros (like Debian and Ubuntu), sudo apt-get install openjdk-<VERSION>-jdk is typically enough to install OpenJDK <VERSION>. On rpm-based distros (like Fedora and Red Hat), try sudo yum install java-<VERSION>-openjdk-devel.
External Library Requirements
Different platforms require different external libraries. In general, libraries are not optional - that is, they are either required or not used.
If a required library is not detected by configure, you need to provide the path to it. There are two forms of the configure arguments to point to an external library: --with-<LIB>=<path> or --with-<LIB>-include=<path to include> --with-<LIB>-lib=<path to lib>. The first variant is more concise, but require the include files an library files to reside in a default hierarchy under this directory. In most cases, it works fine.
@@ -758,12 +751,7 @@
spawn failed
This can be a sign of a Cygwin problem. See the information about solving problems in the Cygwin section. Rebooting the computer might help temporarily.
Getting Help
-
If none of the suggestions in this document helps you, or if you find what you believe is a bug in the build system, please contact the Build Group by sending a mail to . Please include the relevant parts of the configure and/or build log.
+
If none of the suggestions in this document helps you, or if you find what you believe is a bug in the build system, please contact the Build Group by sending a mail to build-dev@openjdk.java.net. Please include the relevant parts of the configure and/or build log.
If you need general help or advice about developing for OpenJDK, you can also contact the Adoption Group. See the section on Contributing to OpenJDK for more information.
Hints and Suggestions for Advanced Users
Setting Up a Forest for Pushing Changes (defpath)
diff -r f62d1d1c2d9c -r 436f1e03fd04 doc/building.md
--- a/doc/building.md Thu Mar 08 13:09:31 2018 -0800
+++ b/doc/building.md Thu Mar 08 22:17:57 2018 +0100
@@ -401,43 +401,31 @@
another JDK for that platform that is usable as boot JDK.
The rule of thumb is that the boot JDK for building JDK major version *N*
-should be an JDK of major version *N-1*, so for building JDK 9 a JDK 8 would be
+should be a JDK of major version *N-1*, so for building JDK 9 a JDK 8 would be
suitable as boot JDK. However, OpenJDK should be able to "build itself", so an
up-to-date build of the current OpenJDK source is an acceptable alternative. If
-you are following the *N-1* rule, make sure you got the latest update version,
-since JDK 8 GA might not be able to build JDK 9 on all platforms.
+you are following the *N-1* rule, make sure you've got the latest update
+version, since JDK 8 GA might not be able to build JDK 9 on all platforms.
+
+Early in the release cycle, version *N-1* may not yet have been released. In
+that case, the preferred boot JDK will be version *N-2* until version *N-1*
+is available.
If the Boot JDK is not automatically detected, or the wrong JDK is picked, use
`--with-boot-jdk` to point to the JDK to use.
-### JDK 8 on Linux
-
-On apt-based distros (like Debian and Ubuntu), `sudo apt-get install
-openjdk-8-jdk` is typically enough to install OpenJDK 8. On rpm-based distros
-(like Fedora and Red Hat), try `sudo yum install java-1.8.0-openjdk-devel`.
-
-### JDK 8 on Windows
-
-No pre-compiled binaries of OpenJDK 8 are readily available for Windows at the
-time of writing. An alternative is to download the [Oracle JDK](
-http://www.oracle.com/technetwork/java/javase/downloads). Another is the [Adopt
-OpenJDK Project](https://adoptopenjdk.net/), which publishes experimental
-prebuilt binaries for Windows.
+### Getting JDK binaries
-### JDK 8 on macOS
+OpenJDK binaries for Linux, Windows and macOS can be downloaded from
+[jdk.java.net](http://jdk.java.net). An alternative is to download the
+[Oracle JDK](http://www.oracle.com/technetwork/java/javase/downloads). Another
+is the [Adopt OpenJDK Project](https://adoptopenjdk.net/), which publishes
+experimental prebuilt binaries for various platforms.
-No pre-compiled binaries of OpenJDK 8 are readily available for macOS at the
-time of writing. An alternative is to download the [Oracle JDK](
-http://www.oracle.com/technetwork/java/javase/downloads), or to install it
-using `brew cask install java`. Another option is the [Adopt OpenJDK Project](
-https://adoptopenjdk.net/), which publishes experimental prebuilt binaries for
-macOS.
-
-### JDK 8 on AIX
-
-No pre-compiled binaries of OpenJDK 8 are readily available for AIX at the
-time of writing. A starting point for working with OpenJDK on AIX is
-the [PowerPC/AIX Port Project](http://openjdk.java.net/projects/ppc-aix-port/).
+On Linux you can also get OpenJDK from the Linux distribution. On apt-based
+distros (like Debian and Ubuntu), `sudo apt-get install openjdk--jdk`
+is typically enough to install OpenJDK \. On rpm-based distros (like
+Fedora and Red Hat), try `sudo yum install java--openjdk-devel`.
## External Library Requirements
diff -r f62d1d1c2d9c -r 436f1e03fd04 make/autoconf/boot-jdk.m4
--- a/make/autoconf/boot-jdk.m4 Thu Mar 08 13:09:31 2018 -0800
+++ b/make/autoconf/boot-jdk.m4 Thu Mar 08 22:17:57 2018 +0100
@@ -77,10 +77,11 @@
BOOT_JDK_VERSION=`"$BOOT_JDK/bin/java" -version 2>&1 | $HEAD -n 1`
# Extra M4 quote needed to protect [] in grep expression.
- [FOUND_CORRECT_VERSION=`$ECHO $BOOT_JDK_VERSION | $EGREP '\"10([\.+-].*)?\"|\"9([\.+-].*)?\"'`]
+ [FOUND_CORRECT_VERSION=`$ECHO $BOOT_JDK_VERSION \
+ | $EGREP "\"(${DEFAULT_ACCEPTABLE_BOOT_VERSIONS// /|})([\.+-].*)?\""`]
if test "x$FOUND_CORRECT_VERSION" = x; then
AC_MSG_NOTICE([Potential Boot JDK found at $BOOT_JDK is incorrect JDK version ($BOOT_JDK_VERSION); ignoring])
- AC_MSG_NOTICE([(Your Boot JDK must be version 9 or 10)])
+ AC_MSG_NOTICE([(Your Boot JDK version must be one of: $DEFAULT_ACCEPTABLE_BOOT_VERSIONS)])
BOOT_JDK_FOUND=no
else
# We're done! :-)
@@ -510,10 +511,10 @@
BUILD_JDK_VERSION=`"$BUILD_JDK/bin/java" -version 2>&1 | $HEAD -n 1`
# Extra M4 quote needed to protect [] in grep expression.
- [FOUND_CORRECT_VERSION=`echo $BUILD_JDK_VERSION | $EGREP '\"10([\.+-].*)?\"'`]
+ [FOUND_CORRECT_VERSION=`echo $BUILD_JDK_VERSION | $EGREP "\"$VERSION_FEATURE([\.+-].*)?\""`]
if test "x$FOUND_CORRECT_VERSION" = x; then
AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK is incorrect JDK version ($BUILD_JDK_VERSION); ignoring])
- AC_MSG_NOTICE([(Your Build JDK must be version 10)])
+ AC_MSG_NOTICE([(Your Build JDK must be version $VERSION_FEATURE)])
BUILD_JDK_FOUND=no
else
# We're done!
diff -r f62d1d1c2d9c -r 436f1e03fd04 make/autoconf/version-numbers
--- a/make/autoconf/version-numbers Thu Mar 08 13:09:31 2018 -0800
+++ b/make/autoconf/version-numbers Thu Mar 08 22:17:57 2018 +0100
@@ -32,6 +32,7 @@
DEFAULT_VERSION_DATE=2018-09-18
DEFAULT_VERSION_CLASSFILE_MAJOR=55 # "`$EXPR $DEFAULT_VERSION_FEATURE + 44`"
DEFAULT_VERSION_CLASSFILE_MINOR=0
+DEFAULT_ACCEPTABLE_BOOT_VERSIONS="9 10 11"
LAUNCHER_NAME=openjdk
PRODUCT_NAME=OpenJDK