Re: ylwrap needs a "mkdir -p"?

"G. Branden Robinson" <[email protected]> Mon, 8 Dec 2025 04:34:02 -0600

Newsgroups	gmane.comp.lib.gnulib.bugs,gmane.comp.printing.groff.general
Message-ID	<20251208103402.o2krmd43sqyqtoac@illithid>

Hi Bruno,

At 2025-12-08T11:21:54+0100, Bruno Haible wrote:
> G. Branden Robinson wrote:
> > how do I patch "build-aux/ylwrap" in situ
> > so that I can hobble along until gnulib has an official fix?
> 
> https://www.gnu.org/software/gnulib/manual/html_node/Extending-Gnulib.html

Thanks!  I'll study that.

> > While compiling groff recently I had a failure.
> > 
> >   YACC     src/preproc/pic/pic.cpp
> > /.../src/GIT/groff/build/../src/preproc/pic/pic.ypp:93.1-7: warning: POSIX Yacc does not support %expect [-Wyacc]
> >    93 | %expect 2
> >       | ^~~~~~~
> > /.../src/GIT/groff/build/../src/preproc/pic/pic.ypp:1456.11-1461.17: warning: rule useless in parser due to conflicts [-Wother]
> >  1456 |         | ORDINAL LAST object_type relative_path
> >       |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > updating src/preproc/pic/pic.output
> > mv: cannot move 'tmp-pic.output' to '../src/preproc/pic/pic.output': No such file or directory
> > ../build-aux/ylwrap: line 206: ../src/preproc/pic/pic.cpp: No such file or directory
> > updating src/preproc/pic/pic.hpp
> > mv: cannot move 'tmp-pic.hpp' to '../src/preproc/pic/pic.hpp': No such file or directory
> > make[2]: *** [Makefile:11822: src/preproc/pic/pic.cpp] Error 1
> 
> Usually it's the responsibility the of the Makefile to create
> directories.

Agreed.

> When you compile a .c file to a .o file, or when you create a file in
> some other ways — from 'cat' to 'sed' — the creation of the target
> directory is part of the Makefile rule, not of the 'gcc', 'cat', or
> 'sed' command.  Why should it be different for 'ylwrap'?

Another part of the GNU build system claimed responsibility for this
task.

> So, how does your Makefile rule for src/preproc/pic/pic.cpp look like?

I don't have one.  I'm relying on Automake.

Here's what it puts in groff's build/Makefile.

.ypp.cpp:
	$(AM_V_YACC)$(am__skipyacc) $(SHELL) $(YLWRAP) $< y.tab.c $@ y.tab.h `echo $@ | $(am__yacc_c2h)` y.output $*.output -- $(YACCCOMPILE)

Just that one line.

Regards,
Branden

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