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Subject: [Bug c++/64697] C++11 thread_local: relocation truncated to fit:
 R_X86_64_PC32 against undefined symbol `TLS init function for N::ptd'
Date: Fri, 01 Oct 2021 08:59:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D64697

--- Comment #26 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Eric Botcazou
<ebotcazou@gcc.gnu.org>:

https://gcc.gnu.org/g:618b7cb3b3fb4d2d92434d31ea8b6746ffef2572

commit r11-9049-g618b7cb3b3fb4d2d92434d31ea8b6746ffef2572
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Fri Oct 1 10:49:34 2021 +0200

    Fix PR c++/64697 at -O1 or above

    The BFD fix eliminates the link failure and working code is generated at
    -O0, but _not_ when optimization is enabled because the optimizer chang=
es:

            movq    .refptr._ZTH1s(%rip), %rax
            testq   %rax, %rax
            je      .L2
            call    _ZTH1s

    into:

            leaq    _ZTH1s(%rip), %rax
            testq   %rax, %rax
            je      .L2
            call    _ZTH1s

    and the leaq now also gets the relocation overflow.  So the fix is to
    teach legitimate_pic_address_disp_p to reject the transformation when
    the symbol is an external weak function, which yields:

            cmpq    $0, .refptr._ZTH1s(%rip)
            je      .L2
            call    _ZTH1s

    and the cmpq keeps a relocation that does not overflow.

    gcc/
            PR c++/64697
            * config/i386/i386.c (legitimate_pic_address_disp_p): For PE-CO=
FF
do
            not return true for external weak function symbols in medium mo=
del.=