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g++/static members/DLL problem
- From: Kohn Emil Dan <emild at cs dot Technion dot AC dot IL>
- To: <cygwin at cygwin dot com>
- Date: Mon, 11 Mar 2002 23:48:44 +0200 (IST)
- Subject: g++/static members/DLL problem
Hello everyone,
I would like to report a problem with g++ static member initialization on
cygwin. I have a class in which I have a static data member. The
definition of that class resides in a DLL. That static member is
initialized in the corresponding .cpp file. However when I access it from
an application, I do not get the initialized value, instead I get just
garbage.
The following example illustrates the problem:
$ cat test_dll.h
#ifndef TEST_DLL_H
#define TEST_DLL_H
class Foo {
public:
static int bar;
};
#endif
$ cat test_dll.cpp
#include "test_dll.h"
int Foo::bar = 17;
$ cat test_app.cpp
#include <stdio.h>
#include "test_dll.h"
int main()
{
printf("Foo::bar=%d\n",Foo::bar);
return 0;
}
The compilation process goes OK:
$ g++ -g -shared test_dll.cpp -o test_dll.dll
emild@TP600EDSL2 ~/junk/cygwin-g++
$ g++ -g -o test_app test_app.cpp test_dll.dll
However, when I run it, I get:
$ ./test_app.exe
Foo::bar=1086858751
This means that the static member did not get initialized properly to 17.
Playing around with gdb hints about the cause of the problem. If
I try to display the address of Foo::bar, it reads
something like: 0x401250
while if I look at the place the .DLL has been loaded using the
info shared
command reveals that the DLL has been loaded at
0x10000000
I seems that for some reason a copy of the static member is produced
inside the executable and worse, that copy does not get properly
initialized.
I use the version of g++ that comes with the latest cygwin distribution
(1.3.10)
$ g++ -v
Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/2.95.3-5/specs
gcc version 2.95.3-5 (cygwin special)
Any help will be greately appreciated.
And the obligatory cygcheck -s -v -r output:
Cygwin Win95/NT Configuration Diagnostics
Current System Time: Mon Mar 11 23:45:46 2002
Windows 2000 Professional Ver 5.0 Build 2195 Service Pack 2
Path: C:\cygwin\usr\local\bin
C:\cygwin\bin
C:\cygwin\bin
c:\WINNT\system32
c:\WINNT
c:\WINNT\system32\WBEM
c:\WINNT\SYSTEM32
c:\WINNT
c:\WINNT\System32\Wbem
SysDir: C:\WINNT\System32
WinDir: C:\WINNT
HOME = `c:\home\emild'
MAKE_MODE = `unix'
PWD = `/cygdrive/c/home/emild'
USER = `emild'
ALLUSERSPROFILE = `C:\Documents and Settings\All Users'
APPDATA = `C:\Documents and Settings\emild\Application Data'
CLASSPATH = `C:\Program Files\Exceed.nt\hcljrcsv.zip;C:\Program Files\Exceed.nt'
COMMONPROGRAMFILES = `C:\Program Files\Common Files'
COMPUTERNAME = `TP600EDSL2'
COMSPEC = `C:\WINNT\system32\cmd.exe'
HOMEDRIVE = `C:'
HOMEPATH = `\home\emild'
LOGONSERVER = `\\TP600EDSL2'
NUMBER_OF_PROCESSORS = `1'
OLDPWD = `/usr/bin'
OS2LIBPATH = `C:\WINNT\system32\os2\dll;'
OS = `Windows_NT'
PATHEXT = `.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH'
PROCESSOR_ARCHITECTURE = `x86'
PROCESSOR_IDENTIFIER = `x86 Family 6 Model 5 Stepping 2, GenuineIntel'
PROCESSOR_LEVEL = `6'
PROCESSOR_REVISION = `0502'
PROGRAMFILES = `C:\Program Files'
PROMPT = `$P$G'
PS1 = `\[\033]0;\w\007
\033[32m\]\u@\h \[\033[33m\w\033[0m\]
$ '
SHLVL = `1'
SYSTEMDRIVE = `C:'
SYSTEMROOT = `C:\WINNT'
TEMP = `c:\DOCUME~1\emild\LOCALS~1\Temp'
TERM = `cygwin'
TMP = `c:\DOCUME~1\emild\LOCALS~1\Temp'
USERDOMAIN = `TP600EDSL2'
USERNAME = `emild'
USERPROFILE = `C:\Documents and Settings\emild'
WINDIR = `C:\WINNT'
_ = `/usr/bin/cygcheck'
HKEY_CURRENT_USER\Software\Cygnus Solutions
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2
(default) = `/cygdrive'
cygdrive flags = 0x00000022
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2\/
(default) = `C:/cygwin'
flags = 0x00000002
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2\/usr/bin
(default) = `C:/cygwin/bin'
flags = 0x00000002
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2\/usr/lib
(default) = `C:/cygwin/lib'
flags = 0x00000002
HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\Program Options
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2
HKEY_LOCAL_MACHINE\SOFTWARE\Cygnus Solutions\Cygwin\Program Options
a: fd N/A N/A
c: hd FAT32 5135Mb 100% CP UN
d: cd N/A N/A
C:/cygwin / user binmode
C:/cygwin/bin /usr/bin user binmode
C:/cygwin/lib /usr/lib user binmode
. /cygdrive user binmode,noumount
Found: C:\cygwin\bin\bash.exe
Found: C:\cygwin\bin\cat.exe
Found: C:\cygwin\bin\cpp.exe
Found: C:\cygwin\bin\find.exe
Found: C:\cygwin\bin\gcc.exe
Found: C:\cygwin\bin\gdb.exe
Found: C:\cygwin\bin\ld.exe
Found: C:\cygwin\bin\ls.exe
Found: C:\cygwin\bin\make.exe
Found: C:\cygwin\bin\sh.exe
612k 2002/01/16 C:\cygwin\bin\cygxml2-2.dll - os=4.0 img=1.0 sys=4.0
"cygxml2-2.dll" v0.0 ts=2002/1/16 6:24
56k 2000/12/03 C:\cygwin\bin\cygbz21.0.dll - os=4.0 img=1.0 sys=4.0
"cygbz21.0.dll" v0.0 ts=2000/11/21 1:53
73k 2002/01/16 C:\cygwin\bin\cygexslt-0.dll - os=4.0 img=1.0 sys=4.0
"cygexslt-0.dll" v0.0 ts=2002/1/16 11:06
202k 2002/01/16 C:\cygwin\bin\cygxslt-1.dll - os=4.0 img=1.0 sys=4.0
"cygxslt-1.dll" v0.0 ts=2002/1/16 10:52
81k 2001/10/20 C:\cygwin\bin\cygitcl30.dll - os=4.0 img=1.0 sys=4.0
"cygitcl30.dll" v0.0 ts=2001/10/20 2:25
35k 2001/10/20 C:\cygwin\bin\cygitk30.dll - os=4.0 img=1.0 sys=4.0
"cygitk30.dll" v0.0 ts=2001/10/20 2:25
390k 2001/10/20 C:\cygwin\bin\cygtcl80.dll - os=4.0 img=1.0 sys=4.0
"cygtcl80.dll" v0.0 ts=2001/10/20 2:24
5k 2001/10/20 C:\cygwin\bin\cygtclpip80.dll - os=4.0 img=1.0 sys=4.0
10k 2001/10/20 C:\cygwin\bin\cygtclreg80.dll - os=4.0 img=1.0 sys=4.0
"cygtclreg80.dll" v0.0 ts=2001/10/20 2:24
623k 2001/10/20 C:\cygwin\bin\cygtk80.dll - os=4.0 img=1.0 sys=4.0
"cygtk80.dll" v0.0 ts=2001/10/20 2:25
19k 2002/02/20 C:\cygwin\bin\cyggdbm.dll - os=4.0 img=1.0 sys=4.0
"cyggdbm.dll" v0.0 ts=2002/2/20 5:05
21k 2001/06/20 C:\cygwin\bin\cygintl.dll - os=4.0 img=1.0 sys=4.0
"cygintl.dll" v0.0 ts=2001/6/20 19:09
22k 2001/12/13 C:\cygwin\bin\cygintl-1.dll - os=4.0 img=1.0 sys=4.0
"cygintl-1.dll" v0.0 ts=2001/12/13 11:28
45k 2001/04/25 C:\cygwin\bin\cygform5.dll - os=4.0 img=1.0 sys=4.0
"cygform5.dll" v0.0 ts=2001/4/25 7:28
26k 2001/04/25 C:\cygwin\bin\cygmenu5.dll - os=4.0 img=1.0 sys=4.0
"cygmenu5.dll" v0.0 ts=2001/4/25 7:27
156k 2001/04/25 C:\cygwin\bin\cygncurses++5.dll - os=4.0 img=1.0 sys=4.0
"cygncurses++5.dll" v0.0 ts=2001/4/25 7:29
226k 2001/04/25 C:\cygwin\bin\cygncurses5.dll - os=4.0 img=1.0 sys=4.0
"cygncurses5.dll" v0.0 ts=2001/4/25 7:17
15k 2001/04/25 C:\cygwin\bin\cygpanel5.dll - os=4.0 img=1.0 sys=4.0
"cygpanel5.dll" v0.0 ts=2001/4/25 7:27
35k 2002/01/09 C:\cygwin\bin\cygform6.dll - os=4.0 img=1.0 sys=4.0
"cygform6.dll" v0.0 ts=2002/1/9 8:03
20k 2002/01/09 C:\cygwin\bin\cygmenu6.dll - os=4.0 img=1.0 sys=4.0
"cygmenu6.dll" v0.0 ts=2002/1/9 8:03
175k 2002/01/09 C:\cygwin\bin\cygncurses++6.dll - os=4.0 img=1.0 sys=4.0
"cygncurses++6.dll" v0.0 ts=2002/1/9 8:03
202k 2002/01/09 C:\cygwin\bin\cygncurses6.dll - os=4.0 img=1.0 sys=4.0
"cygncurses6.dll" v0.0 ts=2002/1/9 8:03
12k 2002/01/09 C:\cygwin\bin\cygpanel6.dll - os=4.0 img=1.0 sys=4.0
"cygpanel6.dll" v0.0 ts=2002/1/9 8:03
17k 2001/06/28 C:\cygwin\bin\cyghistory4.dll - os=4.0 img=1.0 sys=4.0
"cyghistory4.dll" v0.0 ts=2001/1/7 6:34
108k 2001/06/28 C:\cygwin\bin\cygreadline4.dll - os=4.0 img=1.0 sys=4.0
"cygreadline4.dll" v0.0 ts=2001/1/7 6:34
20k 2002/01/13 C:\cygwin\bin\cyghistory5.dll - os=4.0 img=1.0 sys=4.0
"cyghistory5.dll" v0.0 ts=2002/1/13 3:27
121k 2002/01/13 C:\cygwin\bin\cygreadline5.dll - os=4.0 img=1.0 sys=4.0
"cygreadline5.dll" v0.0 ts=2002/1/13 3:27
22k 2002/01/16 C:\cygwin\bin\cygxsltbreakpoint-1.dll - os=4.0 img=1.0 sys=4.0
"cygxsltbreakpoint-1.dll" v0.0 ts=2002/1/16 11:05
40k 2001/11/21 C:\cygwin\bin\cygpcre.dll - os=4.0 img=1.0 sys=4.0
"cygpcre.dll" v0.0 ts=2001/11/22 0:15
39k 2001/11/21 C:\cygwin\bin\cygpcreposix.dll - os=4.0 img=1.0 sys=4.0
"cygpcreposix.dll" v0.0 ts=2001/11/22 0:15
50k 2002/01/20 C:\cygwin\bin\cygz.dll - os=4.0 img=1.0 sys=4.0
"cygz.dll" v0.0 ts=2002/1/20 21:41
35k 2002/02/04 C:\cygwin\bin\cygltdl-3.dll - os=4.0 img=1.0 sys=4.0
"cygltdl-3.dll" v0.0 ts=2002/2/4 3:56
751k 2002/02/25 C:\cygwin\bin\cygwin1.dll - os=4.0 img=1.0 sys=4.0
"cygwin1.dll" v0.0 ts=2002/2/25 18:14
Cygwin DLL version info:
DLL version: 1.3.10
DLL epoch: 19
DLL bad signal mask: 19005
DLL old termios: 5
DLL malloc env: 28
API major: 0
API minor: 51
Shared data: 3
DLL identifier: cygwin1
Mount registry: 2
Cygnus registry name: Cygnus Solutions
Cygwin registry name: Cygwin
Program options name: Program Options
Cygwin mount registry name: mounts v2
Cygdrive flags: cygdrive flags
Cygdrive prefix: cygdrive prefix
Cygdrive default prefix:
Build date: Mon Feb 25 11:14:34 EST 2002
Shared id: cygwin1S3
Cygwin Package Information
Last downloaded files to: C:\cygwin-install
Last downloaded files from: http://planetmirror.com/pub/sourceware/cygwin
Package Version
ash 20020131-1
autoconf 2.52a-1
autoconf-devel 2.52-4
autoconf-stable 2.13-4
automake 1.5b-1
automake-devel 1.5-5
automake-stable 1.4p5-5
bash 2.05a-3
binutils 20011002-1
bison 1.33-1
byacc 1.9-1
bzip2 1.0.1-6
clear 1.0
compface 1.4-5
cpio 2.4.2
crypt 1.0-1
ctags 5.2-1
cvs 1.11.0-1
cygutils 0.9.9-1
cygwin 1.3.10-1
dejagnu 20010117-1
diff 0.0
expect 20010117-1
file 3.37-1
fileutils 4.1-1
findutils 4.1
flex 2.5.4-1
gawk 3.0.4-1
gcc 2.95.3-5
gdb 20010428-3
gdbm 1.8.0-4
gettext 0.10.40-1
gperf 0.0
grep 2.5g
gzip 1.3.2-1
indent 2.2.7-2
libintl 0.10.38-3
libintl1 0.10.40-1
libncurses5 5.2-1
libncurses6 5.2-8
libreadline4 4.1-2
libreadline5 4.2a-1
libtool 20010531a-1
libtool-devel 20020202-1
libtool-stable 1.4.2-2
libxml2 2.4.13-1
libxslt 1.0.10-1
login 1.4-3
m4 0.0
make 3.79.1-5
mingw-runtime 1.2-1
mktemp 1.4-1
ncurses 5.2-8
openssl-devel 0.9.6c-2
patch 2.5-3
pcre 3.7-1
perl 5.6.1-2
pkgconfig 0.10.0-1
popt 1.6.2-1
rcs 5.7-2
readline 4.2a-1
sed 3.02-1
sh-utils 2.0-2
tar 1.13.19-1
termcap 20010825-1
terminfo 5.2-1
textutils 2.0.21-1
time 1.7-1
units 1.77-1
vim 6.0.93-1
w32api 1.2-1
which 1.5-1
zlib 1.1.3-7
Use -h to see help about each section
Regards,
Emil
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