Bug 830863

This package is being added as part of
https://fedoraproject.org/wiki/Features/DwarfCompressor
The other changes needed by that feature will be a small adjustment to find-debuginfo.sh (roughly (untested)
if type dwz > /dev/null 2>&1; then
  files="`find "$RPM_BUILD_ROOT"/usr/lib/debug -type f -name \*.debug`"
  if [ -n "$files" ]; then
    dwz -m .dwz/$NVRA.debug -l $DWZ_LOW_MEM_DIE_LIMIT -L $DWZ_MAX_DIE_LIMIT $files
  fi
fi
) where DWZ_LOW_MEM_DIE_LIMIT and DWZ_MAX_DIE_LIMIT are parameters passed through from some arch macros that depend on how much memory exists on the build boxes for the arch in question and possible 32-bit host address space limitations.
E.g. dwz's default 20000000 for the lower limit and 50000000 limit are hopefully ok for i?86 (won't be able to optimize libxul.so.debug though), for x86_64 could have e.g. the higher limit raised to 120000000, on arm perhaps lowered.
NVRA should be the %{name}-%{version}-%{release}.%{arch} of the package.

http://people.redhat.com/jakub/dwz/dwz.spec is old, used .spec from:
http://people.redhat.com/jakub/dwz/dwz-0.2-1.fc17.src.rpm

dwz.spec:8: W: macro-in-comment %{name}
 - OK.
dwz.spec: W: invalid-url Source0: dwz-0.2.tar.bz2
 - Fix: There must be public downloadable URL for it.
E: incorrect-fsf-address hashtab.c
E: incorrect-fsf-address dwz.c
E: incorrect-fsf-address hashtab.h
 - Fix.
W: manual-page-warning dwz.1.gz 83: warning: macro `Nothing' not defined
 - Fix:
  -into
  -.B FILE
  -\.  Nothing is written if
  +into \fBFILE\fR.  Nothing is written if
W: manual-page-warning dwz.1.gz 132: warning: macro `If' not defined
 - Fix:
  -and in the last file to
  -.I ../../.dwz/foobar-1.2.debug
  -\.  If e.g. bin/foo.debug and bin/foo2.debug were hardlinked
  +and in the last file to \fI../../.dwz/foobar-1.2.debug\fR.
  +If e.g. bin/foo.debug and bin/foo2.debug were hardlinked

make in %build 
 - It should use: %{?_smp_mflags}
BuildRequires: elfutils-libelf-devel
 - It should use: %{?_isa}
As I expect it will go also for EPEL-5 it will need Buildroot, 
  rm -rf $RPM_BUILD_ROOT and maybe some other things.  Not an issue here.

BTW it prints:
dwz.c: In function 'write_dso':
dwz.c:10172:10: warning: ignoring return value of 'fchown', declared with attribute warn_unused_result [-Wunused-result]

(In reply to comment #2)
> dwz.spec: W: invalid-url Source0: dwz-0.2.tar.bz2
>  - Fix: There must be public downloadable URL for it.

I thought it must be there only if instructions aren't given how to generate it from the RCS (the comment right above Source0 line).

> E: incorrect-fsf-address hashtab.c
> E: incorrect-fsf-address dwz.c
> E: incorrect-fsf-address hashtab.h
>  - Fix.
> W: manual-page-warning dwz.1.gz 83: warning: macro `Nothing' not defined
>  - Fix:
>   -into
>   -.B FILE
>   -\.  Nothing is written if
>   +into \fBFILE\fR.  Nothing is written if
> W: manual-page-warning dwz.1.gz 132: warning: macro `If' not defined
>  - Fix:
>   -and in the last file to
>   -.I ../../.dwz/foobar-1.2.debug
>   -\.  If e.g. bin/foo.debug and bin/foo2.debug were hardlinked
>   +and in the last file to \fI../../.dwz/foobar-1.2.debug\fR.
>   +If e.g. bin/foo.debug and bin/foo2.debug were hardlinked

Will fix.  Thanks.

> make in %build 
>  - It should use: %{?_smp_mflags}

Not worth it, but can certainly add it ;)

> BuildRequires: elfutils-libelf-devel
>  - It should use: %{?_isa}
> As I expect it will go also for EPEL-5 it will need Buildroot, 
>   rm -rf $RPM_BUILD_ROOT and maybe some other things.  Not an issue here.

I'll add it so that it can be shared with scl.
 
> BTW it prints:
> dwz.c: In function 'write_dso':
> dwz.c:10172:10: warning: ignoring return value of 'fchown', declared with
> attribute warn_unused_result [-Wunused-result]

That ignoring is intentional, guess I can add some hack to shut up the warning.

(In reply to comment #3)
> (In reply to comment #2)
> > dwz.spec: W: invalid-url Source0: dwz-0.2.tar.bz2
> >  - Fix: There must be public downloadable URL for it.
> 
> I thought it must be there only if instructions aren't given how to generate
> it from the RCS (the comment right above Source0 line).

These decisions are crossing the downstream vs. upstream line:
I expected you will offer dwz-0.2.tar.bz2 on some http site for other distros/users.  Download from GIT is not so user-accessible IMHO.  Moreover when you even give it a version tag.  I would understand no Source URL if you just give GIT snapshot (20120424git1e10c293) into %{version}.

If there is not going to be dwz-0.2.tar.gz on http anywhere then I am sure fine with the .spec.

New http://people.redhat.com/jakub/dwz/dwz.spec and
http://people.redhat.com/jakub/dwz/dwz-0.3-1.fc18.src.rpm
now available.

New Package SCM Request
=======================
Package Name: dwz
Short Description: DWARF optimization and duplicate removal tool
Owners: jakub
Branches: 
InitialCC:

Git done (by process-git-requests).