RE: RE: undefined reference to `_msgDebug' in GCC
-Original Message- From: Anik Pal [mailto:[EMAIL PROTECTED] 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:[EMAIL PROTECTED] Sent: Tuesday, February 05, 2008 8:17 PM To: '[EMAIL PROTECTED]' Subject: RE: RE: undefined reference to `_msgDebug' in GCC Phil, Thanks for the info you provided. Im 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 Im 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 doesnt 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 - 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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
RE: RE: undefined reference to `_msgDebug' in GCC
Anik Pal wrote on Tuesday, February 05, 2008 3:12 PM:: 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 You've only done half of what I said. You only need this: -L/cygdrive/f/geolog6.6.1/lib -lcgg -llicence -llogs_dll \ -lPGILc_dll -lPGILcTool_dll -lcgs -lgeolog6 Here's why: -L/cygdrive/D/cygwin/lib/mingw = look in the mingw lib directory when linking. You don't want to do that if you're compiling a cygwin program, because the mingw libraries expect the program to be linked with msvcrt (see below) -lmsvcrt = link to the Microsoft Visual C Runtime library. You definitely don't want this if you're compiling a cygwin program. -Bstatic -lm = link with the static math library. As I previously explained, the math library is integral to the cygwin C runtime library, so you just don't need this. You should never specify a C runtime library to the compiler because the compiler is generating code for a specific runtime library and if you force the linker to link with a different one you are likely to get all sorts of linkage errors. If the above options don't work, then it's likely that your code (or one of the libraries in geolog6.6.1/lib has calls to native Windows functions. If this is the case, you have two options: 1) replace all Windows function calls with their POSIX equivalent. This will make your code portable to many more platforms. 2) If this is not possible, compile a native Windows program. For this you can either use the mingw version of gcc (where you'll need to use DOS style paths), or you can use cygwin's gcc in cross-compilation mode by specifying the -mno-cygwin option to gcc. Note that if you do this, you won't be able to link to any of the cygwin libraries. You don't need to change the link options from those given above - gcc will automatically link with the msvcrt.dll If you do decide to compile a native windows application, any further questions would be off-topic for this list - the clue is in the no-cygwin bit ;-) But I'm not sure how to remove the dependency on libmsvcrt.a (that comes with mingw lib in cygwin). If you've followed the above, you should now be able to answer that yourself. What is the equivalent lib in cygwin/lib? cygwin1.dll is cygwin's libc. Just leave it up to the compiler to figure out which C library it needs to link to. 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. That link says this: | This is the error you get when you try to link a msvc6 compiled ^ | library with gcc on mingw If you try to mix MSVC code with cygwin code, you are asking for trouble. As I said in my original reply, decide whether you want a cygwin program or a native Windows program and stick to your decision. Phil -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
