Re: gcc9.1 and f2fs

[Michael Chang <mchang@suse.com>]

On Wed, May 08, 2019 at 01:51:20AM +0100, Neil MacLeod wrote:
> Adrian
> 
> I used the attached patch and grub is now building for me with gcc-9.1.
> 
> I've no idea if this is the right solution, but it does at least work
> (ie. builds) which is all I require for now as I'm not personally
> using grub in the distribution I'm building (LibreELEC) and can't
> actually say if it works at run-time.

Hi Neil,

The gcc diagnose here is right and addressed a real problem IMHO, so we
can't suppress it but have to fix the real problem it has pointed out.

I will try to come up with a patch and post it to mailing list.

Thanks,
Michael

> 
> Many thanks
> Neil
> 
> 
> On Mon, 6 May 2019 at 20:58, Neil MacLeod <neil@nmacleod.com> wrote:
> >
> > Hi Adrian
> >
> > With your patch, grub now fails to build as follows:
> >
> > fs/f2fs.c: In function 'grub_f2fs_get_block':
> > fs/f2fs.c:864:43: error: 'offset' may be used uninitialized in this
> > function [-Werror=maybe-uninitialized]
> >   864 |     return grub_le_to_cpu32 (inode->i_addr[offset[0]]);
> >       |                                           ^
> > cc1: all warnings being treated as errors
> > make[4]: *** [Makefile:33773: fs/f2fs_module-f2fs.o] Error 1
> >
> > This is the last 1000 lines of the build log with your patch applied:
> > http://ix.io/1IfE
> >
> > And this is the f2fs.c used for the compilation (it includes your
> > patch): http://ix.io/1IfC
> >
> > Many thanks
> > Neil
> >
> > On Mon, 6 May 2019 at 19:19, Neil MacLeod <neil@nmacleod.com> wrote:
> > >
> > > Thanks Adrian - testing with your patch now, will be another hour or
> > > so until the build is complete (cross-compiling environment with own
> > > toolchain etc.)
> > >
> > > Just a correction, I'm testing with
> > > 4dd4ceec023111a4ccf69f8de6fa0885c6847a35 (current HEAD) - looks like I
> > > cut & pasted a rev from a different repo in my original post!
> > >
> > > Regards
> > > Neil
> > >
> > > On Mon, 6 May 2019 at 18:59, John Paul Adrian Glaubitz
> > > <glaubitz@physik.fu-berlin.de> wrote:
> > > >
> > > > On 5/6/19 7:15 PM, Neil MacLeod wrote:
> > > > > Does anyone have a patch?
> > > >
> > > > Try the attached patch.
> > > >
> > > > Adrian
> > > >
> > > > --
> > > >  .''`.  John Paul Adrian Glaubitz
> > > > : :' :  Debian Developer - glaubitz@debian.org
> > > > `. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
> > > >   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913


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