bug#52711: undefined reference to '__muloti4'

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 21 Dec 2021 20:12:07 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: bug-gnu-emacs@gnu.org, Paul Eggert <eggert@cs.ucla.edu>
> 
> On Tue, Dec 21, 2021 at 09:47:49PM +0200, Eli Zaretskii wrote:
> > > Date: Tue, 21 Dec 2021 19:30:42 +0000
> > > From: Alan Third <alan@idiocy.org>
> > > 
> > > I no longer seem to be able to build the master branch. I'm getting
> > > this error:
> > > 
> > >   CCLD     temacs
> > > fileio.c:6261: error: undefined reference to '__muloti4'
> > > clang: error: linker command failed with exit code 1 (use -v to see invocation)
> > > make[2]: *** [Makefile:697: temacs] Error 1
> > > 
> > > I had a look but couldn't see where the problem comes from. I'm using
> > > clang on Debian testing, if that matters.
> > 
> > Try using "nm -A fileio.o" to see what is that function and which code
> > calls it.
> > 
> > If nothing else helps, try bisecting.  (But my crystal ball says it
> > isn't Emacs that changed, it's something else on that system.)
> 
> Looks like it's gnulib:
> 
> f05a93e8232e6f56458ac16d733b03e96a63e930 is the first bad commit
> commit f05a93e8232e6f56458ac16d733b03e96a63e930
> Author: Paul Eggert <eggert@cs.ucla.edu>
> Date:   Sat Dec 18 16:12:38 2021 -0800
>     Update from gnulib
> 
> I think the actual call is deep within some nested macros.

If you do "nm -A libgnu.a", do you see this function in the library?
If so, from what file does it come?