undefined reference to `_msgDebug' in GCC

Anik Pal anik@vadodara.oilfield.slb.com
Tue Feb 5 15:12:00 GMT 2008

-----Original Message-----
From: Anik Pal [mailto:anik@vadodara.oilfield.slb.com] 
Sent: Tuesday, February 05, 2008 8:17 PM
To: 'cygwin@cygwin.com'
Subject: RE: RE: undefined reference to `_msgDebug' in GCC 

-----Original Message-----
From: Anik Pal [mailto:anik@vadodara.oilfield.slb.com] 
Sent: Tuesday, February 05, 2008 8:17 PM
To: 'Phil.Betts@ascribe.com'
Subject: RE: RE: undefined reference to `_msgDebug' in GCC 
Thanks for the info you provided. I’m not conversant with GCC.  
I remove the path for regular library like libm.a, and all the paths
specified in posix , now my linker option is as follows
-L/cygdrive/f/geolog6.6.1/lib -lcgg -llicence -llogs_dll -lPGILc_dll
-lPGILcTool_dll -lcgs  -lgeolog6 -L/cygdrive/D/cygwin/lib/mingw -lmsvcrt
-Bstatic -lm
But I’m not sure how to remove the dependency on libmsvcrt.a (that comes
with mingw lib in cygwin). What is the equivalent lib in cygwin/lib?
Moreover I followed the solution stated in the following url to get rid of
linking “undefined reference symbol __chkstk”
which actually states to copy chkstk.OBJ from MSVC/lib and rename to
chkstk.o and link with this.
Now linking error goes but when try to execute this exe, it doesn’t gives
any error message but terminate unexpectedly.
Anik Pal
From: "Phil Betts" <Phil dot Betts at ascribe dot com> 
• To: <cygwin at cygwin dot com> 
• Date: Mon, 4 Feb 2008 15:41:43 -0000 
• Subject: RE: undefined reference to `_msgDebug' in GCC 

Anik Pal wrote on Saturday, February 02, 2008 9:05 AM::
> I am trying to using a library in my code whose default compiler is
> MSVCRT. When I try to compile that code in cygwin GCC environment I
> get the following errors
>> undefined reference to `__chkstk'
>> more undefined references to `_msgDebug' follow
> Can anyone tell me which cygwin-mingw library to be added to get rid
> of this linking error?
> My make file linking option I'm providing as follows
> -LF:/geolog6.6.1/lib -lcgg -lgeolog6  -llicence -llogs_dll -lPGILc_dll
> -lPGILcTool_dll -lcgs -llmgr9a -LD:/cygwin/lib -lcygwin
> -LD:/cygwin/lib/mingw -lmsvcrt -Bstatic -LD:/cygwin/lib -lm
First, don't use windows pathnames.  Cygwin is a POSIX environment,
so use POSIX pathnames (I.e. "/cygdrive/f/" instead of "F:/")
Second, you're linking with cygwin AND msvcrt and potentially also
mixing cygwin and mingw libraries.  Don't do that.
The cygwin, msvcrt and mingw are fundamentally incompatible.  
[Although it is possible under very specific circumstances to mix
cygwin and msvcrt, it requires knowledge of the internals of both
libraries, and if you had that knowledge, you wouldn't have posted 
your question, so the advice stands]
Make your mind up whether you want to write a POSIX program or a
Windows program and stick to your decision.
Third, let the compiler choose the C runtime library.  You don't
specify -lcygwin, nor the path to the standard library locations,
so the only -L you need is "-L/cygdrive/f/geolog6.6.1/lib"
Fourth, libm is integral to cygwin1.dll, so you don't need -lm.
The math library supplied with cygwin is only a stub to support 
makefiles such as yours that assume it's necessary.
Anik Pal
Schlumberger, Vadodara, India

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