[Bug middle-end/122516] [avr] 'retain' function attribute ignored even though HAVE_GAS_SHF_GNU_RETAIN

[hjl.tools at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122516

--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> ---
commit r11-6140-g6175383249143309fdc780a02bea484f4450def7
Author: H.J. Lu <hjl.to...@gmail.com>
Date:   Thu Dec 3 11:01:06 2020 -0800

    Switch to a new section if the SECTION_RETAIN bit doesn't match

    When definitions marked with used attribute and unmarked definitions are
    placed in the section with the same name, switch to a new section if the
    SECTION_RETAIN bit doesn't match.

    gcc/

            PR target/98146
            * output.h (switch_to_section): Add a tree argument, default to
            nullptr.
            * varasm.c (get_section): If the SECTION_RETAIN bit doesn't match,
            return and switch to a new section later.
            (assemble_start_function): Pass decl to switch_to_section.
            (assemble_variable): Likewise.
            (switch_to_section): If the SECTION_RETAIN bit doesn't match,
            switch to a new section.

doesn't work with

      asm ("\t.section\t.fini");
      __do_global_dtors_aux ();
      asm ("\t.section\t.text");