[Bug ld/27500] --gc-sections with groups and start/stop syms

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27500

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Alan Modra <amodra@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5789f845fbf67d271e0f5ff154eb03319b551211

commit 5789f845fbf67d271e0f5ff154eb03319b551211
Author: Alan Modra <amodra@gmail.com>
Date:   Wed Mar 3 12:14:55 2021 +1030

    --gc-sections with groups and start/stop syms

    The testcases added here show situations where synthesized start/stop
    symbols don't cause their associated input sections to be marked.
    Fixed with the elflink.c and ldlang.c changes.

    bfd/
            PR 27500
            * elflink.c (_bfd_elf_gc_mark_rsec): Do special start/stop
            processing not when start/stop symbol section is unmarked but
            on first time a start/stop symbol is processed.
    ld/
            * ldlang.c (insert_undefined): Don't mark symbols here.
            (lang_mark_undefineds): Do so here instead, new function.
            (lang_process): Call lang_mark_undefineds.
            * testsuite/ld-gc/start3.d,
            * testsuite/ld-gc/start3.s: New test.
            * testsuite/ld-gc/start4.d,
            * testsuite/ld-gc/start4.s: New test.
            * testsuite/ld-gc/gc.exp: Run them.

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