RFR: JDK-8200358 Remove mapfiles for JDK executables (original) (raw)

Thomas Stüfe thomas.stuefe at gmail.com
Wed Mar 28 14:56:42 UTC 2018

On Wed, Mar 28, 2018 at 2:19 PM, Martin Buchholz <martinrb at google.com> wrote:

I'm not sure about this.

IIRC the AIX linker is able to use executables as a build-time input. Maybe our AIX maintainers have some expertise here. I am quite sure we do not do that in the VM. I'm running a test build with your patch.

Thanks, Thomas

I think the dynamic linker will see symbols in the executable. Resolving them is likely to be strictly more work at startup, and it is likely that the symbols are visible to dlsym(NULL ...)

We have local patches at Google that involve adding symbols to these mapfiles to increase visibility to dlsym. Maintaining mapfiles is no fun, but the precise definition of symbol visibility seems in the Spirit of Java. On Wed, Mar 28, 2018 at 4:08 AM, Magnus Ihse Bursie <_ _magnus.ihse.bursie at oracle.com> wrote: > This patch removes mapfiles for the JDK executables (launchers). There's > really no reason to have mapfiles in the first place for executables. Since > no-one is linking to them, what symbols they export is immaterial. > > Bug: https://bugs.openjdk.java.net/browse/JDK-8200358 > WebRev: http://cr.openjdk.java.net/~ihse/JDK-8200358-remove-launcher > -mapfiles/webrev.01 > > /Magnus > >

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