Re: [musl] [PATCH] Makefile: fix src/api compilation.

["Érico Nogueira" <ericonr@disroot.org>]

On Fri Jul 24, 2020 at 1:33 PM -03, Szabolcs Nagy wrote:
> * Érico Rolim <ericonr@disroot.org> [2020-07-23 00:44:33 -0300]:
> > Adding all .o files in src/api to the api/main.OBJ variable led to them
> > being included twice when linking api/main.exe, which failed with a
> > double definition of the main() function. This can be tested by removing
> > the failing definitions from unistdc.c and running make.
>
> thanks.
>
> > ---
> > 
> > This is a patch for libc-test.
> > 
> >  Makefile | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/Makefile b/Makefile
> > index 86b6ff5..683c850 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -113,7 +113,6 @@ $(B)/common/mtest.o: src/common/mtest.h
> >  $(math.OBJS): src/common/mtest.h
> >  
> >  $(B)/api/main.exe: $(api.OBJS)
> > -api/main.OBJS:=$(api.OBJS)
> >  $(api.OBJS):$(B)/common/options.h
> >  $(api.OBJS):CFLAGS+=-pedantic-errors -Werror -Wno-unused -D_XOPEN_SOURCE=700
>
> this is not the right fix,
>
> the problem is that api/main.o is duplicated:
> once because of the %.exe: %.o rule and once
> in the api/main.OBJS.
>
> but all other api/*.o files are not duplicated
> and should be linked (so we link test all
> referenced symbols not just include header test).
>
> i'm considering doing
>
> $(B)/%.exe: $(B)/%.o
> - $(CC) $(LDFLAGS) $($*.LDFLAGS) -o $@ $< $($*.OBJS) $(LDLIBS)
> $($*.LDLIBS) 2>$@.ld.err || echo BUILDERROR $@; cat $@.ld.err
> + $(CC) $(LDFLAGS) $($*.LDFLAGS) -o $@ $(sort $< $($*.OBJS)) $(LDLIBS)
> $($*.LDLIBS) 2>$@.ld.err || echo BUILDERROR $@; cat $@.ld.err
>
> (note: the make sort function removes duplicates)

Didn't know about that! This worked here as a fix, thanks.