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Message-ID:	<4C198B44.6040803@cwilson.fastmail.fm>
Date:	Wed, 16 Jun 2010 22:41:08 -0400
From:	Charles Wilson <cygwin AT cwilson DOT fastmail DOT fm>
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To:	cygwin AT cygwin DOT com
Subject:	C++ app segfaults in libstdc++
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This problem came up on the libtool list, while trying to track down a
regression test failure on with cygwin-libtool-2.2.10.  It's actually
not a "regression" per se, because the same test failed also on
cygwin-libtool-2.2.7a.  However, it really shouldn't fail, AFAICT.

Anyway, the STC is attached, but the backtrace is:

(gdb) run
Starting program: /c/Users/cwilson/lt/main.exe
[New Thread 10492.0x21ec]
[New Thread 10492.0x2504]
exceptions_in_module
caught inside module: exception in module
caught: exception from module

Program received signal SIGSEGV, Segmentation fault.
0x67282348 in ?? ()
(gdb) bt
#0  0x67282348 in ?? ()
#1  0x6c486825 in cygstdc++-6!__cxa_demangle () from
/usr/bin/cygstdc++-6.dll
#2  0x67f0581d in cyggcc_s-1!_Unwind_DeleteException ()
   from /usr/bin/cyggcc_s-1.dll
#3  0x6c4e89d0 in cygstdc++-6!__cxa_end_catch () from
/usr/bin/cygstdc++-6.dll
#4  0x004013b6 in _fu5___ZSt4cerr () at main.cpp:41
#5  0x004013f9 in main () at main.cpp:55


So, something appears to be dying where it shouldn't really, because I
don't think there's anything wrong with this code.

CXX=g++-4
CXXFLAGS="-O0 -g"
LDFLAGS=
$CXX $CXXFLAGS -c main.cpp -o main.o
$CXX $CXXFLAGS -c module.cpp -o module.o
$CXX $CXXFLAGS $LDFLAGS -shared module.o -o module.dll
$CXX $CXXFLAGS $LDFLAGS -o main main.o -Wl,--export-all-symbols

PATH="`pwd`:$PATH"
main

Any ideas?

--
Chuck

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