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

[Szabolcs Nagy <nsz@port70.net>]

* 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)