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From: "fw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgcc/113403] New: __builtin_nested_func_ptr_created,
 __builtin_nested_func_ptr should be dynamically linked by default
Date: Mon, 15 Jan 2024 16:42:29 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libgcc
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: fw at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113403

            Bug ID: 113403
           Summary: __builtin_nested_func_ptr_created,
                    __builtin_nested_func_ptr should be dynamically linked
                    by default
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgcc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fw at gcc dot gnu.org
  Target Milestone: ---

There are hidden definitions of __builtin_nested_func_ptr_created,
__builtin_nested_func_ptr in libgcc.a. As a result of the default link orde=
r,
the exported global definitions of these functions in libgcc_s.so.1 are nev=
er
used.

This is unfortunate because it means that every DSO that creates a trampoli=
ne
gets its own trampoline cache (one TLS variable and two data pages for
trampolines), increasing the overhead of this feature significantly.=