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From:	"Henrique Seganfredo" <henrique AT seganfredo DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	gcc linking issues with MQSeries library
Date:	Wed, 5 Sep 2007 02:55:08 -0300
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Hello folks,

I am trying to use cygwin´s gcc to compile and link a library (.dll) that is 
supposed to use certain funciton bundled on an IBM provided library, from 
the MQSeries software (messaging middleware).

I am getting a very strange error, that I could not find a single hit on 
google.

The token is: Cannot export MQM_NULL_THUNK_DATA: symbol not found

See the compiler cmdline and output below...

$ uname -a
CYGWIN_NT-5.1 w2691361 1.5.24(0.156/4/2) 2007-01-31 10:57 i686 Cygwin
$ gcc --version
gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)

(inside Eclipse´s CDT...)
**** Build of configuration Debug for project MQExit ****

make -k all
Building file: ../MQExit.c
Invoking: GCC C Compiler
gcc -I"C:\Arquivos de programas\IBM\WebSphere 
MQ\Tools\c\include" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"MQExit.d" 
 -MT"MQExit.d" -o"MQExit.o" "../MQExit.c"

(several warnings go here, but compile seems successfull.)

Finished building: ../MQExit.c

Building target: MQExit.dll
Invoking: GCC C Linker
gcc -L"C:\Arquivos de programas\IBM\WebSphere 
MQ\Tools\Lib" -shared -o"MQExit.dll"  ./MQExit.o   -lmqm
Cannot export MQM_NULL_THUNK_DATA: symbol not found
collect2: ld returned 1 exit status
make: *** [MQExit.dll] Error 1
make: Target `all' not remade because of errors.
Build complete for project MQExit

-----------------

Is this some sort of incompatibility between the gcc linker and the provided 
mqm.lib? Would it only accept if compiled with VC++ from MS?

Regards,

Henrique Seganfredo 



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