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Message-ID: <3A5244A6.494B4089@eagercon.com>
Date: Tue, 02 Jan 2001 13:14:14 -0800
From: Michael Eager <eager AT eagercon DOT com>
MIME-Version: 1.0
To: cygwin AT cygwin DOT com
Subject: SEGV running programs under GDB 5.0
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I installed Cygwin 1.1.7.  Running even trivial programs under
GDB get a SEGV before reaching main().   Any suggestions on 
what is going on?


Here is the GCC for compiling a trivial "Hello World" program:

$ gcc -v -g -o t.exe t.c
Reading specs from /bin/../lib/gcc-lib/i686-pc-cygwin/2.95.2-5/specs
gcc version 2.95.2-5 19991024 (cygwin experimental)
 /bin/../lib/gcc-lib/i686-pc-cygwin/2.95.2-5/cpp.exe -lang-c -v -iprefix /bin/../lib/gcc-lib/i686-pc
-cygwin/2.95.2-5/ -D__GNUC__=2 -D__GNUC_MINOR__=95 -Di386 -D__386__ -D__i386 -D_X86=1 -D__STDC__=1 -
D__stdcall=__attribute__((__stdcall__)) -D__cdecl=__attribute__((__cdecl__)) -D__declspec(x)=__attri
bute__((x)) -D__i386__ -D__386__ -D__i386 -D_X86=1 -D__STDC__=1 -D__stdcall=__attribute__((__stdcall
__)) -D__cdecl=__attribute__((__cdecl__)) -D__declspec(x)=__attribute__((x)) -D__i386 -Asystem(winnt
) -Acpu(i386) -Amachine(i386) -g -remap -Acpu(i386) -Amachine(i386) -Di386 -D__i386 -D__i386__ -Di68
6 -Dpentiumpro -D__i686 -D__i686__ -D__pentiumpro -D__pentiumpro__ -D__CYGWIN32__ -D__CYGWIN__ -Duni
x -D__unix__ -D__unix -D_WIN32 -DWINNT -isystem /usr/include/w32api t.c /cygdrive/c/TEMP/ccQaKyGy.i
GNU CPP version 2.95.2-5 19991024 (cygwin experimental) (80386, BSD syntax)
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/w32api
 /bin/../lib/gcc-lib/i686-pc-cygwin/2.95.2-5/include
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/../../../../include
 /usr/include
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/../../../../include/g++-3
End of omitted list.
 /bin/../lib/gcc-lib/i686-pc-cygwin/2.95.2-5/cc1.exe /cygdrive/c/TEMP/ccQaKyGy.i -quiet -dumpbase t.
c -g -version -o /cygdrive/c/TEMP/ccgbKM35.s
GNU C version 2.95.2-5 19991024 (cygwin experimental) (i686-pc-cygwin) compiled by GNU C version 2.9
5.2-5 19991024 (cygwin experimental).
t.c: In function `main':
t.c:4: warning: return type of `main' is not `int'
 /usr/lib/gcc-lib/i686-pc-cygwin/2.95.2-5/../../../../i686-pc-cygwin/bin/as.exe -o /cygdrive/c/TEMP/
ccUM1zAJ.o /cygdrive/c/TEMP/ccgbKM35.s
 /bin/../lib/gcc-lib/i686-pc-cygwin/2.95.2-5/collect2.exe -Bdynamic -o t.exe /usr/lib/crt0.o -L/bin/
../lib/gcc-lib/i686-pc-cygwin/2.95.2-5 -L/bin/../lib/gcc-lib -L/usr/lib/gcc-lib/i686-pc-cygwin/2.95.
2-5 -L/usr/lib/mingw /cygdrive/c/TEMP/ccUM1zAJ.o -lgcc -lcygwin -luser32 -lkernel32 -ladvapi32 -lshe
ll32 -lgcc


Running gdb:

$ gdb -nw t.exe
GNU gdb 5.0
Copyright 2000 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) run
Starting program: /tmp/t.exe

Program received signal SIGSEGV, Segmentation fault.
0x77f6ce4c in ?? ()
(gdb) where
#0  0x77f6ce4c in ?? ()
#1  0x77f67586 in ?? ()
#2  0x10003985 in ?? ()
#3  0x10002da1 in ?? ()
#4  0x10002551 in ?? ()
#5  0x100022c0 in ?? ()
#6  0x10010150 in ?? ()
#7  0x77f635ab in ?? ()
#8  0x77f6b5fe in ?? ()
#9  0x77f63b86 in ?? ()
#10 0x77f13ac2 in ?? ()
#11 0x77f137da in ?? ()
#12 0x77e7a810 in _size_of_stack_reserve__ ()
#13 0x77f635ab in ?? ()
#14 0x77f6b5fe in ?? ()
#15 0x77f63b86 in ?? ()
#16 0x77f13ac2 in ?? ()
#17 0x77f13838 in ?? ()
#18 0x77f137ca in ?? ()
#19 0x6100163e in _size_of_stack_reserve__ ()
#20 0x6100b507 in _size_of_stack_reserve__ ()
#21 0x61003983 in _size_of_stack_reserve__ ()
#22 0x61003aec in _size_of_stack_reserve__ ()


-- 
Michael Eager	 Eager Consulting     eager AT eagercon DOT com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077

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