Hello again,
Just thought I'd provide an update to the forum about my travails in
trying to build an armhf version of OpenJDK 8...
Gave up trying to cross-compile, and instead built it natively on an Arm
device. The Rasberry Pi is woefully underpowered for such and endeavor,
but I do have a quad-core Cortex-A9 device which is a lot faster. No
way near the speed of even a modest laptop, but nonetheless much better.
After fits and starts, here's the configuration which enabled a partial
build:
$ bash configure --with-jvm-variants=zero --disable-headful
--with-memory-size=1024 --enable-openjdk-only
Comments:
1. Added "--disable-headful" because there were errors building what
looked like part of Java 2d. As no graphics were required, a headless
build is just fine.
2. Added "--with-memory-size=1024". This device only has 1GB RAM, and
without this option, configure will specify that BOOT_JAVAC be run with
the following options: "-Xms256M -Xmx512M". When it comes time to
compiling the 9416 files for BUILD_JDK, an OutOfMemoryException will be
thrown.
By providing the "--with-memory-size=1024"option, configure will now
specify that BOOT_JAVAC will be run with "-Xms400M -Xmx1100M". The
astute will notice that -Xmx1100M is actually larger than physical RAM
which is indeed correct. Which also means that swap space must be
configured, and thrashing will take place during certain parts of the
build. But hey, that's what was needed.
Also note that these systems traditionally use SD cards as their sole
filesystem. The thought of swapping to an SD card based disk sounds
excruciating and it is. To alleviate somewhat, I attached a USB hard
drive and located the build and swap space there.
3. Not sure the "--enable-openjdk-only" is needed.
5. Issued the following command to build:
$ time make LOG=debug JOBS=4 images
real 42m16.850s
user 33m42.020s
sys 4m42.970s
Cheers,
-- Jim C
On 4/29/2014 12:34 PM, Jim Connors wrote:
Hello,
Trying to build OpenJDK 8 for armhf, ultimately to be hosted on a
Raspberry Pi. I'm cross compiling from a Ubuntu 12.04 x86 Virtualbox
image and am using gcc-4.7-linaro-rpi-gnueabihf for a toolchain.
Configuration invocation looks as follows:
$ bash configure
--with-sys-root=/home/jimc/gcc-4.7-linaro-rpi-gnueabihf/
--target=arm-unknown-linux-gnueabihf --with-jvm-variants=zero
--with-num-cores=2
The make fails like this:
Compiling /home/jimc/openjdk8/hotspot/src/os/posix/vm/os_posix.cpp
/home/jimc/openjdk8/hotspot/src/os/linux/vm/os_linux.cpp: In static
member function 'static jint os::init_2()':
/home/jimc/openjdk8/hotspot/src/os/linux/vm/os_linux.cpp:4853:42:
error: 'workaround_expand_exec_shield_cs_limit' was not declared in
this scope
Might there a set of patches that are required to get this going
further? Anything else I'm missing?
Any pointer greatly appreciated,
-- Jim C
--
*Jim Connors,* Principal Sales Consultant
Oracle Alliances & Channels | Java Embedded Global Sales Unit
Office: +1 516.809.5925
Cell: +1 516.782.5501
Email: james.conn...@oracle.com <mailto:james.conn...@oracle.com>
*Learn more about Embeddable Java:*
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