Hi,
when trying to run the following program, which uses the windows winmm
library:
---
#include <stdio.h>
#include <windows.h>
int main(void)
{
// a library call to make sure winmm gets loaded
TIMECAPS tc ;
timeGetDevCaps (&tc, sizeof (TIMECAPS));
printf("hello world\n");
return 0;
}
---
compiled with the following command:
g++ main.cc /usr/lib/w32api/libwinmm.a -Wall -g -O0
I get a segmentation fault under gdb:
---
$ gdb a.exe
GNU gdb 6.5.50.20060706-cvs (cygwin-special)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i686-pc-cygwin"...
(gdb) r
Starting program: /home/geschema/projects/pulsers2/ppc/temp/a.exe
Loaded symbols for /ecos-c/WINDOWS/system32/ntdll.dll
Loaded symbols for /ecos-c/WINDOWS/system32/kernel32.dll
Loaded symbols for /usr/bin/cygwin1.dll
Loaded symbols for /ecos-c/WINDOWS/system32/advapi32.dll
Loaded symbols for /ecos-c/WINDOWS/system32/rpcrt4.dll
Loaded symbols for /ecos-c/WINDOWS/system32/winmm.dll
Loaded symbols for /ecos-c/WINDOWS/system32/user32.dll
Loaded symbols for /ecos-c/WINDOWS/system32/gdi32.dll
Program received signal SIGSEGV, Segmentation fault.
0x18bfb7c3 in wxvault!??0Cwxvault@@[EMAIL PROTECTED] ()
(gdb) bt
#0 0x18bfb7c3 in wxvault!??0Cwxvault@@[EMAIL PROTECTED] ()
#1 0x00000018 in ?? ()
#2 0x00400000 in ?? ()
#3 0x18bf0000 in ?? ()
#4 0x00410000 in ?? ()
#5 0x00400000 in ?? ()
#6 0x00000080 in ?? ()
#7 0x000a2000 in ?? ()
#8 0x00001000 in ?? ()
#9 0x00000001 in ?? ()
#10 0x01000000 in ?? ()
#11 0x0022e8bc in ?? ()
#12 0x00410000 in ?? ()
#13 0x0022e8b4 in ?? ()
#14 0x18bfca38 in wxvault!??0Cwxvault@@[EMAIL PROTECTED] ()
#15 0x0022eb38 in ?? ()
#16 0x18bfca38 in wxvault!??0Cwxvault@@[EMAIL PROTECTED] ()
#17 0x18c09798 in wxvault!??0Cwxvault@@[EMAIL PROTECTED] ()
#18 0x00000000 in ?? ()
---
The problem seems to be related to the winmm library, because it disappears
when I remove the timeGetDevCaps function call in the main function.
Also, the segmentation fault happens *before* the main function is called.
A breakpoint at main() is never reached.
Does someone have a suggestion about how to debug this?
Many thanks,
Guy.
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