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Message-ID: <001401c7847f$3b42b910$0d0e9f88@pc.cpsc.ucalgary.ca>
From: "Islam Hegazy" <islheg@gmail.com>
To: <pgsql-interfaces@postgresql.org>
Subject: modifying in the libpg files
Date: Sat, 21 Apr 2007 19:40:29 -0600
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Hi there
I am a grad student in CS University of Calgary. I work on  project to =
modify the behavior of the table functions to return on iterative base =
instead of materialization. So far I have succeeded in doing this it =
seems now that I am one step away from the end. I face a problem now =
with the front-end, how to display the rows as they are received. That =
is I want to call 'PrintQueryTuples' from within 'PQexecFinish' instead =
of 'SendQuery'. 'PQexecFinish' is defined in =
'../src/interfaces/libpq/fe-exec.c' and 'PrintQueryTuples' is defined in =
'../src/bin/psql/common.c'

I made the following steps:=20
1) redefined 'PrintQueryResults' in common.c to be extern (not static as =
the initial definition) to be able to use it elsewhere 2) added a =
declaration for ''PrintQueryResults' in common.h, to tell other files =
about it=20
3) removed 'PrintQueryResults' invocation from 'SendQuery' in common.c
4) added #include "../bin/psql/common.h" to fe-exec.c
5) called 'PrintQueryResults' from within 'PQexecFinish', last statement =
in the while loop=20
when I gmake the project I receive the following error:
"
../../src/interfaces/libpq/libpq.so: undefined reference to =
`PrintQueryResults'
collect2: ld returned 1 exit status
gmake[5]: *** [test1] Error 1
gmake[5]: Leaving directory =
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces/ecpg/test/connect=
'
gmake[4]: *** [all] Error 2
gmake[4]: Leaving directory =
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces/ecpg/test'
gmake[3]: *** [all] Error 2
gmake[3]: Leaving directory =
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces/ecpg'
gmake[2]: *** [all] Error 2
gmake[2]: Leaving directory =
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces'
gmake[1]: *** [all] Error 2
gmake[1]: Leaving directory =
`/home/grads/imehegaz/postgresql-8.2.3-b/src'
gmake: *** [all] Error 2

=20
"

I wonder what does this error mean and how to solve it?Notice: in the =
backend, I also invoked functions in different files and directories and =
I didn't face this problem.

Regards
Islam Hegazy

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<DIV><TT></TT>&nbsp;</DIV>
<DIV><TT>Hi there</TT></DIV>
<DIV><TT>I am a grad student in CS University of Calgary. I work =
on&nbsp;=20
project to modify the behavior of the table functions to return on =
iterative=20
base instead of materialization. So far I have succeeded in doing this=20
i</TT><TT>t seems now that I am one step away from the end. I face a =
problem now=20
with the front-end, how to display the rows as they are received. That =
is I want=20
to call 'PrintQueryTuples' from within 'PQexecFinish' instead of =
'SendQuery'.=20
'PQexecFinish' is defined in '../src/interfaces/libpq/fe-exec.c' and=20
'PrintQueryTuples' is defined in '../src/bin/psql/common.c'</TT></DIV>
<DIV><TT></TT>&nbsp;</DIV><PRE style=3D"MARGIN: 0em"></PRE>
<DIV><TT>I made the following steps: </TT></DIV><PRE style=3D"MARGIN: =
0em"></PRE>
<DIV><TT>1) redefined 'PrintQueryResults' in common.c to be extern (not =
static=20
as the </TT><TT>initial definition) to be able to use it elsewhere =
</TT><TT>2)=20
added a declaration for ''PrintQueryResults' in common.h, to tell other=20
</TT><TT>files about it </TT></DIV><PRE style=3D"MARGIN: 0em">3) removed =
'PrintQueryResults' invocation from 'SendQuery' in common.c
4) added #include "../bin/psql/common.h" to fe-exec.c
</PRE>
<DIV><TT>5) called 'PrintQueryResults' from within 'PQexecFinish', last=20
statement in </TT><TT>the while loop </TT></DIV><PRE style=3D"MARGIN: =
0em">when I gmake the project I receive the following error:
"
</PRE>
<DIV><TT><FONT face=3DArial =
size=3D2>../../src/interfaces/libpq/libpq.so: undefined=20
reference to `PrintQueryResults'<BR>collect2: ld returned 1 exit=20
status<BR>gmake[5]: *** [test1] Error 1<BR>gmake[5]: Leaving directory=20
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces/ecpg/test/connect=
'<BR>gmake[4]:=20
*** [all] Error 2<BR>gmake[4]: Leaving directory=20
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces/ecpg/test'<BR>gma=
ke[3]:=20
*** [all] Error 2<BR>gmake[3]: Leaving directory=20
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces/ecpg'<BR>gmake[2]=
: ***=20
[all] Error 2<BR>gmake[2]: Leaving directory=20
`/home/grads/imehegaz/postgresql-8.2.3-b/src/interfaces'<BR>gmake[1]: =
*** [all]=20
Error 2<BR>gmake[1]: Leaving directory=20
`/home/grads/imehegaz/postgresql-8.2.3-b/src'<BR>gmake: *** [all] Error=20
2<BR></FONT></TT></DIV>
<DIV><TT> </TT></DIV><PRE style=3D"MARGIN: 0em">"

I wonder what does this error mean and how to solve it?</PRE><PRE =
style=3D"MARGIN: 0em">&nbsp;</PRE><PRE style=3D"MARGIN: 0em">Notice: in =
the backend, I also invoked functions in different files and directories =
and I didn't face this problem.

Regards
Islam Hegazy
</PRE></BODY></HTML>

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