Re: [Fwd] Issue 25164 in oss-fuzz: qemu: Fuzzing build failure

[Alexander Bulekov]

On 200826 1715, Paolo Bonzini wrote:
> On Wed, Aug 26, 2020 at 3:56 PM Alexander Bulekov <alxndr@bu.edu> wrote:
> >
> > On 200825 0958, Paolo Bonzini wrote:
> > > Il lun 24 ago 2020, 00:58 Alexander Bulekov <alxndr@bu.edu> ha scritto:
> > >
> > > > Hi Paolo,
> > > > Our oss-fuzz builds started failing, after the meson merge. I think I
> > > > tracked down the issues:
> > > > 1.) Looking at the build-log here:
> > > >
> > > > https://oss-fuzz-build-logs.storage.googleapis.com/log-d43d402c-1ce5-4422-b3db-ccbf83a862a0.txt
> > > > The error happens at link-time. Re-running the build with V=1:
> > > > "/usr/bin/ld" ...
> > > > --whole-archive 
> > > > /usr/local/lib/clang/12.0.0/.../libclang_rt.asan-x86_64.a \
> > > > --start-group ..... -T /src/qemu/tests/qtest/fuzz/fork_fuzz.ld  \
> > > > -wrap qtest_inb -wrap qtest_inw ..... --end-group .....
> > > >
> > >
> > > I think you can put everything into a response for and include it with
> > > @fuzz.cmd in the command line.
> >
> > I don't think I understand. Should I provide the entire linker command,
> > by email?
> 
> You can create a file fuzz.cmd.in containing
> 
> -Wl,-T,@FUZZING_LINKER_SCRIPT@
> -Wl,-wrap,qtest_inb
> -Wl,-wrap,qtest_inw
> 
> etc.
> 
> Create a fuzz.cmd that includes the correct path to fuzz.ld in the
> source tree (using configure_file) and pass this file to the linker
> using @tests/libqtest/fuzz/fuzz.cmd in link_args (and also
> link_depends). See libblock and block for an example.

I'm not sure whether this solves the problem that the linker-script is
placed in between --start-group and --end-group arguments.  It seems
that no matter what I do to specify the linker script with -Wl,-T, and
link_args, the flag ends up placed between --start-group and --end-group
due to some parsing that meson does in
mesonbuild/compilers/mixins/clike.py.

Relevant:
https://github.com/mesonbuild/meson/pull/7505
-Alex

> Paolo
> 
> Paolo
>