[PATCH] Update RPATH to make loading libjawt possible (original) (raw)

Kumar Srinivasan kumar.x.srinivasan at oracle.COM
Thu Aug 9 12:39:55 UTC 2012

Hello Omair,

Hi Kumar,

On 07/23/2012 11:19 AM, Kumar Srinivasan wrote: My suggestion is to see if System.loadLibrary can be used, this will bode well for the modularization effort. I discussed this with the folks at awt-dev and they would prefer to avoid loading as much as possible. They are strongly against always preloading libjawt.so.

If this must be added to RPATH in which case, append this last to ensure we don't break anything. Yes, the awt folks have asked me to use this approach. The attached patch updates the RPATH in the launchers to add the arch dir to RPATH. A couple of questions: 1. I am not sure if this problem exists on windows or on other operating systems and what sort of fixes are appropriate there. How do I deal with this?e No on window the %PATH% variable is used to load all dynamic libraries.

2. This patch uses RPATH (and not RUNPATH). This makes it impossible to use LDLIBRARYPATH to override the linker path. I don't see any potential dangerous effects (pretty much all libraries in the have an RPATH), and I suspect it's even intentional (so JDK6 can exec JDK7 with an LDLIBRARYPATH set and things will continue working). Does OpenJDK support platforms with RUNPATH (-Wl,--enable-new-dtags) ? Yes if jdk6 is used to exec jdk7+, the launcher will set the LD_LIBRARY_PATH to protects itself from jdk6's LLP, and exec itself.

Please see http://hg.openjdk.java.net/jdk7u/jdk7u-dev/jdk/rev/d8dfd1a0bd8d

I don't know what --enable-new-dtags is and what it does.

3. I cant seem to get http://hg.openjdk.java.net/jdk8/build to build. It seems to be missing a number of fixes needed to build with newer versions of gcc and glibc. The patch applies to both jdk8/build and jdk7u/jdk7u-dev. I have only build with 7. jdk8 will need to be built and tested with your changes!. I will try to apply your patch and submit it to our build system, when I get a spare cycle.

Thanks

Kumar

Thanks, Omair

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