glibc-2.2{8,9} multiarch build failure on x86_64 with gcc 9

[Arvind Sankar]

On Wed, May 01, 2019 at 02:48:30PM -0400, Arvind Sankar wrote:
> On Wed, May 01, 2019 at 02:36:10PM -0400, Carlos O'Donell wrote:
> > On 5/1/19 2:24 PM, Arvind Sankar wrote:
> > > gcc 9 when configured for fortran installs ISO_Fortran_Binding.h in
> > > 	gfor_cdir = $(libdir)/gcc/$(target_alias)/$(gcc_version)$(MULTISUBDIR)/include
> > > For x86_64's 32-bit architecture support, this creates a subdirectory named 'include'
> > > inside $(libsubdir)/32 which didn't use to exist in gcc 8.
> > This doesn't seem correct.
> > 
> > I would have expected the header to exist under the target name, for example:
> > 
> > /usr/lib/gcc/i686-redhat-linux/9/include/ISO_Fortran_binding.h
> > 
> > This way it doesn't conflict with other uses.
> > 
> > Perhaps there is enough variability in the way you build, package, and install this
> > that it can break in some configurations.
> > 
> > I think the gcc community needs to comment on this.
> > 
> > -- 
> > Cheers,
> > Carlos.
> 
> To be clear, it does exist there as well (I think because the native arch has an
> empty MULTISUBDIR. The breakage happens because it _also_ exists under .../9/32/include.

Including Paul -- looks like the file gets installed in different places
in fortran-dev branch vs trunk?