[PATCH v3] ld: add --package-metadata

[Luca Boccassi]

On Thu, 2022-05-26 at 13:25 +0930, Alan Modra wrote:
> On Wed, May 25, 2022 at 02:41:47PM +0100, luca.boccassi@gmail.com wrote:
> > From: Luca Boccassi <bluca@debian.org>
> > 
> > Generate a .note.package FDO package metadata ELF note, following
> > the spec: https://systemd.io/ELF_PACKAGE_METADATA/
> > 
> > If the jansson library is available at build time (and it is explicitly
> > enabled), link ld to it, and use it to validate that the input is
> > correct JSON, to avoid writing garbage to the file. The
> > configure option --enable-jansson has to be used to explicitly enable
> > it (error out when not found). This allows bootstrappers (or others who
> > are not interested) to seamlessly skip it without issues.
> > ---
> > v2: fix style issues
> >     fix ASAN issue: note storage is rounded up, but that size
> >     was used to read the json input, which is fixed
> >     add entry to NEWS
> >     add note about json validation to docs
> > v3: switch libjansson support to disabled-by-default even if
> >       the library is available in the build environment
> >     update new test to account for old/new readelf, which
> >       might or might not pretty-print the FDO note
> >     update bootstrap test to link with jansson if the object
> >       files being linked were built with it
> >     remove dead code
> 
> I'm about to commit this with a few formatting fixes, and with a
> working bootstrap.exp change.  That one was obviously not tested.  The
> idea was good but ld config.h is not in $srcdir/.., and besides that
> it's on the build machine not the host (*), and plain grep is more
> likely to exist than fgrep.
> 
> *) build vs host doesn't matter much in bootstrap.exp since those
> tests are only run when native, but I'd like to get it correct for
> someone doing copy/paste for a future config.h test.

Thanks for fixing it! I did test it, and it was working on my machine,
both with and without the new build flag:

Running /home/bluca/git/binutils-gdb/ld/testsuite/ld-bootstrap/bootstrap.exp ...
Running /home/bluca/git/binutils-gdb/ld/testsuite/ld-bpf/bpf.exp ...

I imagine this is because I was running 'make check' from the ld/
directory? I took '$srcdir' and 'fgrep' from existing scripts in other
tests in ld/testsuite. Anyway, the important thing is that it's all
good now.

Thanks again!

-- 
Kind regards,
Luca Boccassi
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