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Subject: [Bug target/105599] g++ by itself is not producing "fatal error: no
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Date: Wed, 15 Jun 2022 19:07:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105599

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Iain D Sandoe
<iains@gcc.gnu.org>:

https://gcc.gnu.org/g:58c0bc2b62cdbbe9d9677b448fe52a8c54044276

commit r12-8484-g58c0bc2b62cdbbe9d9677b448fe52a8c54044276
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sun May 29 16:14:32 2022 +0100

    Darwin: Fix empty g++ command lines [PR105599].

    An empty g++ command line should produce a diagnostic that there are no
    inputs.  The PR is that currently Darwin produces a dignostic about mis=
sing
    link items instead - this is because (errnoeously), for this driver, we=
 are
    creating a link job for empty command lines.

    The problem occurs in four stages:

     The g++ driver appends -shared-libgcc to the command line.

     The Darwin driver_init code in the backend does not see this (it sees =
an
     empty command line).

     When the back end driver code driver sees an empty command line, it do=
es
not
     add any supplementary flags (e.g. asm-macosx-version-min) - precisely =
to
     avoid anything being claimed as an input_file and therefore triggering=
 a
link
     line.

     Since we do not have a value for asm-macosx-version-min when processing
the
     driver specs, we unconditionally inject 'multiply_defined suppress' wh=
ich
is
     used with shared libgcc (but only intended on very old Darwin).  This =
then
     causes the generation of a link job.

    The solution, for the present, is to move version-specific link params =
to
the
    LINK_SPEC so that they are only processed when a link job has already b=
een
    decided.

    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

            PR target/105599

    gcc/ChangeLog:

            * config/darwin.h: Move versions-specific handling of
multiply_defined
            from SUBTARGET_DRIVER_SELF_SPECS to LINK_SPEC.

    (cherry picked from commit 794737976b9a6418eab817f143bb4eb2d0c834d2)=