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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug driver/99896] g++ drops -lc
Date: Sun, 04 Apr 2021 02:02:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99896

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matz at suse dot de

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #4)
> (In reply to Tom de Vries from comment #2)
> > 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.=20
>=20
> OK, it's dropped because it's always present at the end.
>=20
> This is similar to adding -I/usr/include which gets ignored, because it's
> already going to be searched anyway as a system header directory. Quoting
> the manual:
>=20
> "If a standard system include directory, or a directory specified with
> -isystem, is also specified with -I, the -I option is ignored."
>=20
>=20=20
> > Um, for my understanding, does that mean you agree this is a bug in g++?
>=20
> No.
>=20

OK, so here ( https://gcc.gnu.org/onlinedocs/gcc/Invoking-GCC.html#Invoking=
-GCC
) I read:
...
Also, the placement of the -l option is significant.=20
...

So, if the documentation of gcc says that placement of the -l option is
significant, then why does g++ decide to mess with that?  ISTM g++ violates
documented behaviour.=