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Message
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| balaraju |
 Posted: Thu Apr 13, 2017 4:33 am Post subject: c++ compile issue ImqStr |
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Apprentice
Joined: 06 Feb 2017
Posts: 29
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We have written custom c++ code to browse messages from queue. When we try to compile our code on Red hat Linux with gcc/g++ compiler, it is throwing the below error. Please help
error: ambiguous overload for 'operator+=' (operand types are 'ImqStr' and 'MQLONG {aka int}')
candidates are:
In file included from /opt/mqm/inc/imqobj.hpp:27:0,
from /opt/mqm/inc/imqmgr.hpp:26,
from /opt/mqm/inc/imqair.hpp:28,
from /opt/mqm/inc/imqi.hpp:26,
command run : /usr/bin/g++ -fsigned-char -o outfile br.cpp -I/opt/mqm/inc -L/opt/mqm/lib64 -Wl,-rpath=/opt/mqm/lib64 -Wl,-rpath=/usr/lib64 -limqs23gl -limqb23gl -lmqm |
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| mqjeff |
| Posted: Thu Apr 13, 2017 4:54 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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It seems you are trying to add things together and the compiler can't decide which class has a "++" operator to use.
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| balaraju |
| Posted: Thu Apr 13, 2017 5:14 am Post subject: |
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Joined: 06 Feb 2017
Posts: 29
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some more logs
note: candidates are:
In file included from /opt/mqm/inc/imqobj.hpp:27:0,
from /opt/mqm/inc/imqmgr.hpp:26,
from /opt/mqm/inc/imqair.hpp:28,
from /opt/mqm/inc/imqi.hpp:26,
from br.cpp:112:
/opt/mqm/inc/imqstr.hpp:62:8: note: void ImqStr::operator+=(const ImqStr&)
void operator += ( const ImqString & );
^
/opt/mqm/inc/imqstr.hpp:63:8: note: void ImqStr::operator+=(char)
void operator += ( const char );
^
/opt/mqm/inc/imqstr.hpp:64:8: note: void ImqStr::operator+=(const char*) <near match>
void operator += ( const char * );
^
/opt/mqm/inc/imqstr.hpp:64:8: note: no known conversion for argument 1 from 'MQLONG {aka int}' to 'const char*'
/opt/mqm/inc/imqstr.hpp:65:8: note: void ImqStr::operator+=(double)
void operator += ( const double );
^
/opt/mqm/inc/imqstr.hpp:66:8: note: void ImqStr::operator+=(long int)
void operator += ( const long );
^ |
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| mqjeff |
| Posted: Thu Apr 13, 2017 5:21 am Post subject: |
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Joined: 25 Jun 2008
Posts: 17447
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What, exactly, are you trying to add together?
The error
| Quote: |
| /opt/mqm/inc/imqstr.hpp:64:8: note: no known conversion for argument 1 from 'MQLONG {aka int}' to 'const char*' |
seems clear...
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| balaraju |
| Posted: Thu Apr 13, 2017 5:27 am Post subject: |
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Joined: 06 Feb 2017
Posts: 29
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the syntax is similar to amqsbcg/c.
Our executable name object(queue name) queue manager name and couple of options to browse with message id or show them in ascii mode etc... This code was written years ago for Unix (xlc++). Now we have been trying to make it work with Linux (gcc/g++) |
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| mqjeff |
| Posted: Thu Apr 13, 2017 5:51 am Post subject: |
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Joined: 25 Jun 2008
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amqsbcg is not a C++ program.
amqsbcg0.c doesn't include anything named ImqString.
I believe the MQ C++ class libraries are at least 'stabilized' if not actually out of support.
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| balaraju |
| Posted: Thu Apr 13, 2017 6:17 am Post subject: |
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| the ImqString is defined in imqstr.hpp and we are referring this in our headers... |
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| Vitor |
| Posted: Thu Apr 13, 2017 6:26 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| balaraju wrote: |
| the ImqString is defined in imqstr.hpp and we are referring this in our headers... |
Which versions are in play here? What version of the MQ client libs, which version of Red Hat, which compiler version (I'm disinclined to assume it's the one that comes with the distro at this point).
Also, if the requirement is so simple (and probably pointless), why not re-write it to reflect more modern code thinking? Or replace it with one of the many free and paid utilities that can do this, and probably offer many more features you may be able to exploit?
<plug><Iowe>MQGem for example</Iowe></plug>
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| mqjeff |
| Posted: Thu Apr 13, 2017 6:28 am Post subject: |
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| balaraju wrote: |
| the ImqString is defined in imqstr.hpp and we are referring this in our headers... |
I'm sure that's true.
What data suggests that this is related to the issue?
The issue you have shows in problem trying to use "++" between two objjects, that the compiler doesn't know how to add.
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| balaraju |
| Posted: Thu Apr 13, 2017 6:32 am Post subject: |
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Hi Vitor,
The version of mq is 9, Red hat is 7 and g++ is 4.
We already have this working in Unix, we want to leverage the same for Linux without major changes and trying any workarounds... |
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| bruce2359 |
| Posted: Thu Apr 13, 2017 6:37 am Post subject: |
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Joined: 05 Jan 2008
Posts: 9486
Location: US: west coast, almost. Otherwise, enroute.
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What's different? Which UNIX is it working in? Which compiler? Which MQ?
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| balaraju |
| Posted: Thu Apr 13, 2017 6:41 am Post subject: |
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| mqjeff |
| Posted: Thu Apr 13, 2017 6:42 am Post subject: |
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| balaraju |
| Posted: Thu Apr 13, 2017 6:48 am Post subject: |
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Thanks Jeff.. we tried these options but no luck  May be issue with compiler and code compatibility... |
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| Vitor |
| Posted: Thu Apr 13, 2017 6:58 am Post subject: |
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Grand High Poobah
Joined: 11 Nov 2005
Posts: 26093
Location: Texas, USA
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| balaraju wrote: |
| the ImqString is defined in imqstr.hpp and we are referring this in our headers... |
I notice here that the documentation somewhat contradicts this:
| Quote: |
| There is a single C++ header file, imqi.hpp, which covers all of these classes |
Are you specifically importing and referencing imqstr.hpp? I doubt that's going to help and I can envisage a scenario where it would cause this problem.
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