This was clearly an error but I can explain and fix it.
There were overlapping main/gccmain (or so) functions in src/mingw and
src/gcc-4.4.0/gcc/libgcc2.c . Both were calling constructors and
destructors.
Now, here's a debug session that shows that the constructor of the
iostream crashes.
How do I go about debugging this ?
Danny
pavilion: {3} i386-mingw32ce-gdb hello.exe
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show
copying"
and "show warranty" for details.
This GDB was configured as "--host=i686-pc-linux-gnu
--target=i386-mingw32ce"...
(gdb) target remote ebox:9999
Remote debugging using ebox:9999
[New Thread 96010250]
Error while mapping shared library sections:
\network\x86\libgcc_s_sjlj-1.dll: No such file or directory.
Error while mapping shared library sections:
libstdc++-6.dll: No such file or directory.
Error while mapping shared library sections:
\Windows\coredll.dll: No such file or directory.
Symbol file not found for \network\x86\libgcc_s_sjlj-1.dll
Symbol file not found for libstdc++-6.dll
Symbol file not found for \Windows\coredll.dll
WinMainCRTStartup (hInst=0x5b3000a, hPrevInst=0x0, lpCmdLine=0x2201fc70,
nCmdShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/crt3.c:35
35 {
Current language: auto; currently c
(gdb) s
41 _fpreset (); /* Supplied by the runtime
library. */
(gdb)
44 _pei386_runtime_relocator ();
(gdb)
_pei386_runtime_relocator ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/pseudo-reloc.c:33
33 for (r = (runtime_pseudo_reloc*) start; r <
(runtime_pseudo_reloc*) end; r++)
(gdb)
46 }
(gdb)
WinMainCRTStartup (hInst=0x5b3000a, hPrevInst=0x0, lpCmdLine=0x2201fc70,
nCmdShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/crt3.c:49
49 __atexit_init();
(gdb)
__atexit_init ()
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/atexit.c:65
65 first_atexit = (p_atexit_fn*) malloc (32 * sizeof
(p_atexit_fn));
(gdb)
66 if (first_atexit == NULL ) /* can't allocate memory */
(gdb)
73 *first_atexit = NULL;
(gdb)
74 next_atexit = first_atexit;
(gdb)
76 }
(gdb)
WinMainCRTStartup (hInst=0x5b3000a, hPrevInst=0x0, lpCmdLine=0x2201fc70,
nCmdShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/crt3.c:54
54 __gccmain();
(gdb)
__gccmain ()
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/gccmain.c:79
79 if (!initialized)
(gdb)
81 initialized = 1;
(gdb)
86 }
(gdb)
WinMainCRTStartup (hInst=0x5b3000a, hPrevInst=0x0, lpCmdLine=0x2201fc70,
nCmdShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/crt3.c:62
62 nRet = WinMain(hInst, hPrevInst, lpCmdLine, nCmdShow);
(gdb)
WinMain (hInst=0x5b3000a, hPrevInst=0x0, szCmdLine=0x2201fc70, nShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/winmain_ce.c:147
147 __mainArgs(&__argc, &__argv, szCmdLine);
(gdb)
__mainArgs (cmdlinePtrW=0x2201fc70)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/winmain_ce.c:103
103 cmdnameBufW[0] = 0;
(gdb)
104 modlen = GetModuleFileNameW(NULL, cmdnameBufW, sizeof
(cmdnameBufW)/sizeof (cmdnameBufW[0]));
(gdb)
106 if (!cmdlinePtrW)
(gdb)
109 cmdlineLen = wcslen(cmdlinePtrW);
(gdb)
111 __cmdlinebuf = malloc (modlen + 1 + cmdlineLen + 1);
(gdb)
112 if (!__cmdlinebuf)
(gdb)
115 *argv = malloc (sizeof (char**) * 1);
(gdb)
116 if (!*argv)
(gdb)
119 (*argv)[0] = __cmdlinebuf;
(gdb)
120 wcstombs((*argv)[0], cmdnameBufW, wcslen(cmdnameBufW) + 1);
(gdb)
122 (*argc)++;
(gdb)
124 if (cmdlineLen > 0)
(gdb)
128 *argc = _parse_tokens(argv1, argv, 1);
(gdb)
132 (*argv)[*argc] = 0;
(gdb)
134 }
(gdb)
WinMain (hInst=0x5b3000a, hPrevInst=0x0, szCmdLine=0x2201fc70, nShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/winmain_ce.c:151
151 return main(__argc, __argv, NULL);
(gdb)
152 }
(gdb)
WinMain (hInst=0x5b3000a, hPrevInst=0x0, szCmdLine=0x2201fc70, nShow=5)
at /home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/mingw/winmain_ce.c:151
151 return main(__argc, __argv, NULL);
(gdb)
main (argc=1, argv=0x22020690) at hello.C:6
6 {
Current language: auto; currently c++
(gdb)
_alloca ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/config/i386/cygwin.asm:38
38 pushl %ecx /* save temp */
Current language: auto; currently asm
(gdb)
39 leal 8(%esp), %ecx /* point past return addr */
(gdb)
40 cmpl $0x1000, %eax /* > 4k ?*/
(gdb)
41 jb Ldone
(gdb)
51 subl %eax, %ecx
(gdb)
52 orl $0x0, (%ecx) /* less than 4k, just peek here
*/
(gdb)
54 movl %esp, %eax /* save old stack pointer */
(gdb)
55 movl %ecx, %esp /* decrement stack */
(gdb)
_alloca ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/config/i386/cygwin.asm:56
56 movl (%eax), %ecx /* recover saved temp */
(gdb)
57 movl 4(%eax), %eax /* recover return address */
(gdb)
62 pushl %eax
(gdb)
_alloca ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/config/i386/cygwin.asm:63
63 ret
(gdb)
main (argc=1, argv=0x22020690) at hello.C:6
6 {
Current language: auto; currently c++
(gdb)
__main ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/libgcc2.c:2185
2185 if (! initialized)
Current language: auto; currently c
(gdb)
2187 initialized = 1;
(gdb)
2190 }
(gdb)
__main ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/libgcc2.c:2188
2188 __do_global_ctors ();
(gdb)
__do_global_ctors ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/libgcc2.c:2158
2158 {
(gdb)
_alloca ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/config/i386/cygwin.asm:38
38 pushl %ecx /* save temp */
Current language: auto; currently asm
(gdb)
39 leal 8(%esp), %ecx /* point past return addr */
(gdb)
40 cmpl $0x1000, %eax /* > 4k ?*/
(gdb)
41 jb Ldone
(gdb)
51 subl %eax, %ecx
(gdb)
52 orl $0x0, (%ecx) /* less than 4k, just peek here
*/
(gdb)
54 movl %esp, %eax /* save old stack pointer */
(gdb)
55 movl %ecx, %esp /* decrement stack */
(gdb)
_alloca ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/config/i386/cygwin.asm:56
56 movl (%eax), %ecx /* recover saved temp */
(gdb)
57 movl 4(%eax), %eax /* recover return address */
(gdb)
62 pushl %eax
(gdb)
_alloca ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/config/i386/cygwin.asm:63
63 ret
(gdb)
__do_global_ctors ()
at
/home/danny/src/cegcc/svn.sf.net/cegcc/trunk/cegcc/src/gcc-4.4.0/libgcc/../gcc/libgcc2.c:2165
2165 DO_GLOBAL_CTORS_BODY;
Current language: auto; currently c
(gdb)
global constructors keyed to main () at hello.C:9
9 }
Current language: auto; currently c++
(gdb)
__static_initialization_and_destruction_0 (__initialize_p=1,
__priority=65535) at hello.C:9
9 }
(gdb)
72 static ios_base::Init __ioinit;
(gdb)
Program received signal SIGSEGV, Segmentation fault.
0x42351505 in ?? ()
(gdb) detach
Ending remote debugging.
(gdb) q
pavilion: {4}
On Wed, 2009-06-17 at 18:17 +0200, Danny Backx wrote:
> Hmm, very interesting.
>
> \network\x86> gdbserver :9999 /network/x86/ctor.exe
> Process /network/x86/ctor.exe created; pid = 100466698
> Listening on port 9999
> Remote debugging from host 172.17.1.10
> ctor B
> ctor B
> ctor A
> Hello
> dtor A
> dtor B
> dtor B
>
> Child exited with status 0
> GDBserver exiting
>
> The constructor and destructor for B are called twice instead of once.
>
> Danny
--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
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