[Bug ld/24601] aarch64: local-exec TPREL relocations to weak undefined symbols -> assertion fail

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=24601

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot 
gnu.org> ---
The master branch has been updated by Tamar Christina
<address@hidden>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=652afeef247770b22c44ca292d1f4c65be40a696

commit 652afeef247770b22c44ca292d1f4c65be40a696
Author: Tamar Christina <address@hidden>
Date:   Thu Aug 22 11:35:35 2019 +0100

    AArch64: Fix LD crash on weak and undefined TLS symbols. (PR/24602).

    This patch fixes a few linker crashes due to TLS code reaching an assert
when it
    shouldn't.

    The first scenario is with weak TLS symbols that remain weak during
linking.  In
    this case the mid-end would not have seen a TLS symbol and so wouldn't have
    allocated the TLS section.  We currently assert here and the linker crashes
with
    a not very useful message.

    This patch changes this to return the value 0 for the TLS symbol in
question
    emulating what lld and gold and other BFD targets do.  However because weak
TLS
    is implementation defined and we don't define any behavior for it I also
emit a
    warning to the user to inform them of such.

    Secondly when a strong TLS reference is undefined. The linker crashes even
after
    it correctly reported that there is an undefined reference.  This changes
it so
    that it gracefully exits and reports a useful error.

    bfd/ChangeLog:

        PR ld/24601
        * elfnn-aarch64.c (aarch64_relocate): Handle weak TLS and undefined
TLS.
        Also Pass input_bfd to _bfd_aarch64_elf_resolve_relocation.
        * elfxx-aarch64.c (_bfd_aarch64_elf_resolve_relocation): Use it.
        * elfxx-aarch64.h (_bfd_aarch64_elf_resolve_relocation): Emit warning
        for weak TLS.

    ld/ChangeLog:

        PR ld/24601
        * testsuite/ld-aarch64/aarch64-elf.exp (undef-tls, weak-tls): New.
        * testsuite/ld-aarch64/undef-tls.d: New test.
        * testsuite/ld-aarch64/undef-tls.s: New test.
        * testsuite/ld-aarch64/weak-tls.d: New test.
        * testsuite/ld-aarch64/weak-tls.s: New test.

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