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* [Bug libstdc++/112551] New: Incompatibility of libstdc++ liked statically and -Bsymbolic-functions
@ 2023-11-15 16:54 serge.guelton@telecom-bretagne.eu
2023-11-16 7:30 ` [Bug libstdc++/112551] " rguenth at gcc dot gnu.org
2024-01-30 6:41 ` [Bug libstdc++/112551] Incompatibility of libstdc++ linked " sjames at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: serge.guelton@telecom-bretagne.eu @ 2023-11-15 16:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112551
Bug ID: 112551
Summary: Incompatibility of libstdc++ liked statically and
-Bsymbolic-functions
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: serge.guelton@telecom-bretagne.eu
Target Milestone: ---
Created attachment 56595
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56595&action=edit
reproducer
Hey folks,
While debugging a firefox issue, we found an interesting bug where a program
linked statically against libstdc++ and dynamically against a library that's
itself statically linked against libstdc++, both with -Bsymbolic-functions, is
segfaulting at startup (during Elf con structor init)
The attached tarball provides a minimal reproducer.
Our understanding of the problem is that an initializer from the libstdc++ is
run by the host binary, updating locale::_S_once from the host. Then the shared
libray initializes itself, calls the same initializer through its
non-interposed version, checks the interposed symbol locale::_S_once (remember
we only have -Bsymbolic-functions and not -Bsymbolic), decides everything is
initialized, and proceeds to call a local function that references local
storage that's not initialized, kaboom.
Given the setup, I'm not quite sure libstdc++ should actually support the
scenario, but maybe there's a way?
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libstdc++/112551] Incompatibility of libstdc++ liked statically and -Bsymbolic-functions
2023-11-15 16:54 [Bug libstdc++/112551] New: Incompatibility of libstdc++ liked statically and -Bsymbolic-functions serge.guelton@telecom-bretagne.eu
@ 2023-11-16 7:30 ` rguenth at gcc dot gnu.org
2024-01-30 6:41 ` [Bug libstdc++/112551] Incompatibility of libstdc++ linked " sjames at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2023-11-16 7:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112551
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Don't use -Bsymbolic-functions then? You are actively breaking the C++
standard guarantees here. Not to say, don't use static linking, but hey ... or
at least fully statically link the application.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug libstdc++/112551] Incompatibility of libstdc++ linked statically and -Bsymbolic-functions
2023-11-15 16:54 [Bug libstdc++/112551] New: Incompatibility of libstdc++ liked statically and -Bsymbolic-functions serge.guelton@telecom-bretagne.eu
2023-11-16 7:30 ` [Bug libstdc++/112551] " rguenth at gcc dot gnu.org
@ 2024-01-30 6:41 ` sjames at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: sjames at gcc dot gnu.org @ 2024-01-30 6:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112551
--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
Writeup about this:
https://hacks.mozilla.org/2024/01/option-soup-the-subtle-pitfalls-of-combining-compiler-flags/.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-01-30 6:41 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2023-11-15 16:54 [Bug libstdc++/112551] New: Incompatibility of libstdc++ liked statically and -Bsymbolic-functions serge.guelton@telecom-bretagne.eu
2023-11-16 7:30 ` [Bug libstdc++/112551] " rguenth at gcc dot gnu.org
2024-01-30 6:41 ` [Bug libstdc++/112551] Incompatibility of libstdc++ linked " sjames at gcc dot gnu.org
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