RFR: 8214796: Create a jlink plugin for stripping debug info symbols from native libraries

[Severin Gehwolf]

Hi Erik,

On Thu, 2019-02-07 at 17:01 -0800, Erik Joelsson wrote:
> On 2019-02-07 11:09, Severin Gehwolf wrote:
> > Hi Erik,
> > 
> > On Thu, 2019-02-07 at 09:39 -0800, Erik Joelsson wrote:
> > > Hello Severin,
> > > 
> > > There is a macro for automatically finding all source dirs for a module.
> > > So in Gensrc-jdk.jlink.gmk, I think it would be better expressed using
> > > that macro, like this:
> > > 
> > > JLINK_RESOURCE_DIRS := $(wildcard $(addsuffix
> > > /jdk/tools/jlink/resources, $(call FindModuleSrcSdirs, jdk.jlink)))
> > > 
> > > The above could/should even be inlined.
> > I've considered this. It seems, though, that FindModuleSrcDirs comes
> > from make/common/Modules.gmk which isn't included in
> > make/gensrc/Gensrc-jdk.jlink.gmk. Given that it has already caused
> > problems with multiple includes of Modules.gmk (JDK-8213736) I was
> > reluctant to include it here too. Without the new include the above
> > won't work.
> > 
> > The approach I've taken here seems to be the lesser evil. Thoughts?
> 
> I appreciate your concern, but JDK-8213736 was a problem in Main.gmk, 
> which is part of where Modules.gmk gets bootstrapped. In any normal 
> makefile (as in where stuff is just being built), the bootstrapping is 
> done and including Modules.gmk is completely fine. Any 
> <phase>-<module>.gmk file certainly qualifies here.

OK. Updated:
http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8214796/05/

Thanks,
Severin

> /Erik
> 
> > Thanks,
> > Severin
> > 
> > > Otherwise build changes look ok.
> > > 
> > > /Erik
> > > 
> > > On 2019-02-07 09:09, Severin Gehwolf wrote:
> > > > Hi,
> > > > 
> > > > Could I please get reviews for this enhancement? It adds a
> > > > debug
> > > > symbols stripping plug-in to jlink for Linux and Unix
> > > > platforms. It's
> > > > the first platform specific jlink plugin and the approach taken
> > > > for
> > > > keeping it contained is to use a plugin specific
> > > > ResourceBundle.
> > > > Discussion for this happened in [1].
> > > > 
> > > > The test uses a native library which should never get debug
> > > > symbols
> > > > stripped during the test library build. As such, tiny
> > > > modifications
> > > > were needed to make/common/TestFilesCompilation.gmk. Hence,
> > > > build-dev
> > > > being on the list for this RFR. The test currently only runs on
> > > > Linux
> > > > and requires objcopy to be available. Otherwise the test is
> > > > being
> > > > skipped.
> > > > 
> > > > Example usage of this plugin is described in the bug.
> > > > 
> > > > webrev: 
> > > > http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8214796/04/webrev/
> > > > Bug: https://bugs.openjdk.java.net/browse/JDK-8214796
> > > > 
> > > > Testing: test/jdk/tools/jlink test/jdk/jdk/modules tests on
> > > > Linux
> > > > x86_64 (with good and broken objcopy) and the newly added test.
> > > > It's
> > > > currently running through jdk/submit too.
> > > > 
> > > > Thoughts?
> > > > 
> > > > Thanks,
> > > > Severin
> > > > 
> > > > [1] 
> > > > http://mail.openjdk.java.net/pipermail/jigsaw-dev/2019-January/014109.html
> > > >