gnulib m4/threadlib.m4 bug crashing package tests
Yaakov Selkowitz
yselkowitz@cygwin.com
Thu Nov 25 18:25:22 GMT 2021
On Thu, 2021-11-25 at 11:26 -0500, Ken Brown via Cygwin-apps wrote:
> On 9/29/2021 7:46 PM, Brian Inglis wrote:
> > There is a gnulib bug in threadlib.m4 from at least serial 29 to serial
> > 31 that incorrectly configures Cygwin support of weak references.
> >
> > This leads to SIGSEGV stack smashing crashes with no backtrace
> > @ 0x00000000100000000 or 0x0000000500000000 etc. normally during tests.
> >
> > Akim Demaille on bug-bison referred the issue to bug-gnulib where
> > Bruno Haible diagnosed and patched the problem to appear in
> > m4/threadlib.m4 serial 32:
> >
> > * m4/threadlib.m4 (gl_WEAK_SYMBOLS): Force a "guessing no" result on
> > Cygwin
> > https://lists.gnu.org/archive/html/bug-gnulib/2021-09/msg00068.html
> > [gl_cv_have_weak="guessing no"]
> >
> > The patch has now been applied to bison, wget, and wget2, and I have
> > attached my patches for the copies in those packages, in case anyone
> > else has this issue in their (mainly GNU) packages which may incorporate
> > by
> > inclusion recently updated gnulib m4 macros used in autotools builds.
>
> Thanks, Brian.
>
> I'm writing to reinforce this warning. I just spent 2 days trying to debug
> mysterious texinfo crashes that were caused by this bug. I could have saved
> a
> lot of time if I had remembered your email and had checked the gnulib
> version
> being used by texinfo.
>
> For anyone else who bumps into this, gdb and strace are of no use in
> debugging
> this crash. I finally thought to look at the stackdump file, and the second
> address from the top was in a gnulib file. That was the key clue.
Add gl_cv_have_weak=no to cygconf?
--
Yaakov
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