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

[Severin Gehwolf]

Hi Alan, Mandy,

Here is the next round of this change:
http://cr.openjdk.java.net/~sgehwolf/webrevs/JDK-8214796/06/webrev/

It now also has tests which don't require objcopy to be present on test
machines as well as being integrated with --strip-debug (once JDK-
8218913 is pushed). --list-plugins help output for --strip-native-
debug-symbols now reads:

----->8-------------------------
Plugin Name: strip-native-debug-symbols
Option: --strip-native-debug-symbols=<omit-debuginfo|keep-debuginfo>
Description: Strip debug symbols from native libraries (if any). 
 This plugin requires at least one option: 
   objcopy: The path to the objcopy binary. Defaults to objcopy in PATH.
   omit-debuginfo: Do not keep debug info files. Defaults to true.
   keep-debuginfo[=<ext>]: Keep debug info files in <file>.<ext>.
                           Defaults to <file>.debuginfo 
 Examples: --strip-native-debug-symbols objcopy=/usr/bin/objcopy
           --strip-native-debug-symbols=omit-debuginfo
           --strip-native-debug-symbols keep-debuginfo:objcopy=objcopy
----->8-------------------------

Testing: jdk.jlink tests jdk/submit (ongoing), added tests:
         DefaultStripDebugPluginTest, StripNativeDebugSymbolsPluginTest

Note: IntegrationTest needed a heap size bump as this now runs
      StripNativeDebugSymbolsPluginTest on some systems. Especially with
      --with-native-debug-symbols=internal builds this can eat some
      memory.

Please let me know what you think.

Thanks,
Severin

On Wed, 2019-02-13 at 15:36 -0800, Mandy Chung wrote:
> On 2/13/19 1:04 AM, Severin Gehwolf wrote:
> > >      --strip-native-debug-symbols no-keep-debuginfo
> > --strip-native-debug-symbols strip-debuginfo
> > --strip-native-debug-symbols remove-debuginfo
> > 
> > It would avoid using negation.
> 
> What about 'omit', i.e.
> 
> --strip-native-debug-symbols  omit-debuginfo
> --strip-native-debug-symbols  keep-debuginfo=<ext>
> 
> > Sure. I've filed JDK-8218913 for doing this first. Would a name of --
> > strip-java-debug-symbols be acceptable? My thinking is that it would
> > have nice symmetry with --strip-native-debug-symbols. Thoughts?
> 
> --strip-native-debug-symbols is okay.
> 
> Having a second thought, javac -g and gcc -g both say "debugging
> information".  I think we could go with:
> 
> --strip-java-debug-info
> --strip-native-debug-info  omit-debuginfo
> --strip-native-debug-info  keep-debuginfo=<ext>
> 
> unless anyone thinks `-debug-symbols` is better?
> 
> The options are getting pretty good now.
> 
> Mandy