On 20/10/2020 14:43, Jon Turney wrote:
> Express that gendef generates sigfe.s and cygwin.def in a slightly less
> nutty way.
> ---
>   winsup/cygwin/Makefile.in | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/winsup/cygwin/Makefile.in b/winsup/cygwin/Makefile.in
> index a56a311b8..9d05b17b3 100644
> --- a/winsup/cygwin/Makefile.in
> +++ b/winsup/cygwin/Makefile.in
> @@ -785,16 +785,13 @@ $(VERSION_OFILES): version.cc
>   Makefile: ${srcdir}/Makefile.in
>   	/bin/sh ./config.status
>   
> -$(DEF_FILE): gendef $(srcdir)/$(TLSOFFSETS_H) $(DIN_FILE)
> +$(DEF_FILE) sigfe.s: gendef $(srcdir)/$(TLSOFFSETS_H) $(DIN_FILE)
>   	$(word 1,$^) --cpu=${target_cpu} --output-def=$@  --tlsoffsets=$(word 2,$^) $(wordlist 3,99,$^)

Using $@ is wrong if make decides to build sigfe.s first, and $^ will 
contain an unwanted $(DEF_FILE) from the dependency below.

So please try the attached instead.

But maybe I need to do a bit more staring at [1].

[1] 
https://www.gnu.org/software/automake/manual/html_node/Multiple-Outputs.html

>   
>   $(srcdir)/$(TLSOFFSETS_H): gentls_offsets cygtls.h
>   	$^ $@ $(target_cpu) $(COMPILE.cc) -c || rm $@
>   
>   sigfe.s: $(DEF_FILE)
> -	@[ -s $@ ] || \
> -	{ rm -f $(DEF_FILE); $(MAKE) -s -j1 $(DEF_FILE); }; \
> -	[ -s $@ ] && touch $@
>   
>   sigfe.o: sigfe.s $(srcdir)/$(TLSOFFSETS_H)
>   	$(CC) ${CFLAGS} -c -o $@ $<
>