Date: Tue, 05 Feb 2008 20:41:54 +0530
From: Anik Pal <anik AT vadodara DOT oilfield DOT slb DOT com>
Subject: RE: RE: undefined reference to `_msgDebug' in GCC
To: cygwin AT cygwin DOT com
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-----Original Message-----
From: Anik Pal [mailto:anik AT vadodara DOT oilfield DOT slb DOT com] 
Sent: Tuesday, February 05, 2008 8:17 PM
To: 'cygwin AT cygwin DOT com'
Subject: RE: RE: undefined reference to `_msgDebug' in GCC 

 
-----Original Message-----
From: Anik Pal [mailto:anik AT vadodara DOT oilfield DOT slb DOT com] 
Sent: Tuesday, February 05, 2008 8:17 PM
To: 'Phil DOT Betts AT ascribe DOT com'
Subject: RE: RE: undefined reference to `_msgDebug' in GCC 
 
Phil,
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”
http://eegeerg.blogspot.com/2008_01_01_archive.html#4158852069709002699 
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.
Regards
Anik Pal
India
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
> 
>
F:/geolog6.6.1/lib/libgeolog6.a(fileprintf.o):C:/development/ptc:(.text+
0x9)
>> undefined reference to `__chkstk'
[snip]
>> 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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