RFR: JDK-8200358 Remove mapfiles for JDK executables

[Martin Buchholz]

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 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
>
>