[Bug ld/25490] __patchable_function_entries section doesn't work with --gc-sections

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25490

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by H.J. Lu <address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5242a0a000ad7d3f2fa1cd0023f692d53261b302

commit 5242a0a000ad7d3f2fa1cd0023f692d53261b302
Author: H.J. Lu <address@hidden>
Date:   Thu Feb 6 19:37:54 2020 -0800

    ld: Issue an error for GC on __patchable_function_entries section

    __patchable_function_entries section is generated by a compiler with
    -fpatchable-function-entry=XX.  The assembly code looks like this:

    ---
        .text
        .globl  _start
        .type   _start, %function
    _start:
        .section __patchable_function_entries,"aw",%progbits
        .dc.a   .LPFE1
        .text
    .LPFE1:
        .byte 0
    ---

    But --gc-sections will silently remove __patchable_function_entries
    section and generate corrupt result.  This patch disallows garbage
    collection on __patchable_function_entries section without linked-to
    section.

    bfd/

        PR ld/25490
        * elflink.c (_bfd_elf_gc_mark_extra_sections): Issue an error
        for garbage collection on __patchable_function_entries section
        without linked-to section.

    ld/

        PR ld/25490
        * testsuite/ld-elf/pr25490-1.d: New file.
        * testsuite/ld-elf/pr25490-1.s: Likewise.

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