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Subject: [Bug threads/27239] gdb/cp-support.c:1619:(.text+0x5502): relocation
 truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init
 function for thread_local_segv_handler'
Date: Fri, 12 Mar 2021 17:29:36 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27239

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gn=
u.org> ---
The gdb-10-branch branch has been updated by Christian Biesinger
<cbiesinger@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D1ee63759b094=
c15300f9cd74da20830a6e1137c7

commit 1ee63759b094c15300f9cd74da20830a6e1137c7
Author: Christian Biesinger <cbiesinger@google.com>
Date:   Tue Mar 9 08:16:23 2021 -0600

    Use RAII to set the per-thread SIGSEGV handler

    This avoids using a thread-local extern variable, which causes link err=
ors
    on some platforms, notably Cygwin.  But I think this is a better pattern
    even outside of working around linker bugs because it encapsulates dire=
ct
    access to the variable inside the class, instead of having a global ext=
ern
    variable.

    The cygwin link error is:
    cp-support.o: in function `gdb_demangle(char const*, int)':
=20=20=20
/home/Christian/binutils-gdb/obj/gdb/../../gdb/cp-support.c:1619:(.text+0x6=
472):
relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS in=
it
function for thread_local_segv_handler'
=20=20=20
/home/Christian/binutils-gdb/obj/gdb/../../gdb/cp-support.c:1619:(.text+0x6=
48b):
relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS in=
it
function for thread_local_segv_handler'
    collect2: error: ld returned 1 exit status

    2021-03-12  Christian Biesinger  <cbiesinger@google.com>

            PR threads/27239
            * cp-support.c: Use scoped_segv_handler_restore.
            * event-top.c (thread_local_segv_handler): Made static.
            (scoped_segv_handler_restore::scoped_segv_handler_restore):
            New function.
            (scoped_segv_handler_restore::~scoped_segv_handler_restore): New
            function.
            * event-top.h (class scoped_segv_handler_restore): New class.
            (thread_local_segv_handler): Removed.

--=20
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