[Bug driver/99896] g++ drops -lc

["vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99896

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> (In reply to Tom de Vries from comment #0)
> > With g++, we have instead:
> > ...
> > collect2 ... main.o foo.o -lpcre2-posix ...
> > ...
> 
> It isn't dropped, it's moved to the end:
> 
> main.o foo.o -lpcre2-posix -lstdc++ -lm -lc -lgcc_s -lgcc -lc -lgcc_s -lgcc
> 

I don't understand. AFAICT, it's dropped.  It's not moved to the end, because
-lc is already at the end without specifying -lc. 

> If you need it before foo.o then -Wl,-lc seems like the right workaround for
> me.
> 

Um, for my understanding, does that mean you agree this is a bug in g++?

> Why is it needed there anyway though?

main.o is intended to use regcomp from glibc.  Foo.o is intended to use
pcre2_regcomp from pcre2-posix (which is also accessible using plain regcomp). 
When -lc is droppend, regcomp from pcre2-posix is used by main instead, which
is incompatible with using re_search from glibc.