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| MQWays |
 Posted: Wed Apr 30, 2008 3:26 am Post subject: Compiling MQ Code in C |
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Acolyte
Joined: 20 Jan 2008
Posts: 61
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I am new to writing MQ Code in C on Linux. I am trying to do a 'gcc' on the C program and it returns the following:
:undefined reference to 'main'
/tmp/cchvNJQe.o(.text+0x6f3): In function 'PutAfter':
:undefined reference to 'MQPUT'
/tmp/cchvNJQe.o(.text+0xab8): In function 'Put1After':
and many similar lines......
Am I missing any library required for the compilation. Please assist. |
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| Vitor |
| Posted: Wed Apr 30, 2008 3:39 am Post subject: Re: Compiling MQ Code in C |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| MQWays wrote: |
I am new to writing MQ Code in C on Linux. I am trying to do a 'gcc' on the C program and it returns the following:
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There are instructions on compilation & linking (which varies according to client or sever side requirements) in the APG.
A search on gcc within the forum may also throw up useful tips.
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Honesty is the best policy.
Insanity is the best defence. |
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| Gaya3 |
| Posted: Wed Apr 30, 2008 3:40 am Post subject: |
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Jedi
Joined: 12 Sep 2006
Posts: 2493
Location: Boston, US
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did you include cmqc.h header
Regards
Gayathri
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Gayathri
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| Vitor |
| Posted: Wed Apr 30, 2008 3:43 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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Moved to non-Java forum
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| MQWays |
| Posted: Wed Apr 30, 2008 3:44 am Post subject: |
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Acolyte
Joined: 20 Jan 2008
Posts: 61
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| I am modifying the mirrorq utility. I am sure everything is already in place. My environment probably needs to be set for compilation. |
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| Vitor |
| Posted: Wed Apr 30, 2008 3:49 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| MQWays wrote: |
| I am modifying the mirrorq utility. |
It's not a utility, it's a sample exit. As some of the discussions on mirrorq in here have aluded to, in it's current form it's not considered production strength.
If you're new to C code (in this environment or generally) I urge you to be cautious and extensively. A badly coded/compiled/linked exit (which has different rules to an app) can at best kill the performance of the queue manager and at worst bring the queue manager down in flames.
Exits are an advanced topic, and you would be well advised to review some of the material in the forum. There's a good thread somewhere from Roger about writing & compiling exits, and avoiding some of the pitfalls. Mirrorq has also been the subject of discussion.
Caution & testing, caution & testing. 
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| RogerLacroix |
| Posted: Wed Apr 30, 2008 7:12 pm Post subject: |
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Jedi Knight
Joined: 15 May 2001
Posts: 3264
Location: London, ON Canada
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| tleichen |
| Posted: Thu May 01, 2008 5:56 am Post subject: |
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Yatiri
Joined: 11 Apr 2005
Posts: 663
Location: Center of the USA
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| Vitor wrote: |
...
If you're new to C code (in this environment or generally) I urge you to be cautious and extensively. A badly coded/compiled/linked exit (which has different rules to an app) can at best kill the performance of the queue manager and at worst bring the queue manager down in flames.
Exits are an advanced topic, and you would be well advised to review some of the material in the forum. There's a good thread somewhere from Roger about writing & compiling exits, and avoiding some of the pitfalls. Mirrorq has also been the subject of discussion.... |
I agree. Exits ARE an advanced topic and if you are new to the programming language, please don't try to get your feet wet in programming ANY language by writing MQ exits! It WILL turn out badly! 
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