g++ not working for postgresql extension languages?

Hello,

Here is something very important that I think might be a bug for you to look
into as there is some aparent inconsistancies

I was doing some testing before I started to write my c++ routine to extend
PostgreSQL 7.03 on my Linux box and found this problem.

I made two copies of the same file called "funcs.c" and "funcs.cc" as can be
see below.

If I work with the "funcs.cc" file then I can get:
-------------------------------------------------------------------------

[root@Treazurac /test]# g++ -I./include -I./backend -O2 -Wall
-Wmissing-prototypes -Wmissing-declarations -I/usr/include/pgsql -I/usr/include
-fpic -c -o funcs.o funcs.cc

[root@Treazurac /test]# g++ -shared -o funcs.so funcs.o

[root@Treazurac /test]# ls

Makefile  Makefile.global  Makefile.port  funcs.cc  funcs.o  funcs.so*
funcs.sql

[root@Treazurac /test]# pico -w funcs.sql

[root@Treazurac /test]# psql -f funcs.sql -d trdata
DROP
CREATE

[root@Treazurac /test]# psql trdata
Welcome to psql, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help on internal slash commands
       \g or terminate with semicolon to execute query
       \q to quit

trdata=# select concat_text('a','b');
ERROR:  Can't find function concat_text in file /test/funcs.so
trdata=#
--------------------------------------------------------------------------

And although I should not be running as "root", this is a test machine and it
is ok for the time being.

If I do the same thing as above, but using the "funcs.c" file (which is the
exact same file just renamed)
---------------------------------------------------------------------------
funcs.c and funcs.cc
-------------------------
#include "postgres.h"           // for variable length type

#include <stdio.h> #include <string.h> #include <stdlib.h> #include <time.h>
#include <unistd.h> // for unix crypt function

text *
concat_text(text *arg1, text *arg2);

text *
concat_text(text *arg1, text *arg2)
{
    int32 new_text_size = VARSIZE(arg1) + VARSIZE(arg2) - VARHDRSZ;
    text *new_text = (text *) malloc(new_text_size);

    memset((void *) new_text, 0, new_text_size);
    VARSIZE(new_text) = new_text_size;
    strncpy(VARDATA(new_text), VARDATA(arg1), VARSIZE(arg1)-VARHDRSZ);
    strncat(VARDATA(new_text), VARDATA(arg2), VARSIZE(arg2)-VARHDRSZ);
    return (new_text);
}
--------------------------------------------------------------------------

with funcs.sql
------------------
DROP FUNCTION concat_text(text, text);
CREATE FUNCTION concat_text(text, text) RETURNS text
     AS '/test/funcs.so' LANGUAGE 'c';
----------------------------------------------------------------------------

With the "funcs.c" file in place I get:
-----------------------------------------------------------------------------
[root@Treazurac /test]# gcc -I./include -I./backend -O2 -Wall
-Wmissing-prototypes -Wmissing-declarations -I/usr/include/pgsql -I/usr/include
-fpic -c -o funcs.o funcs.c

[root@Treazurac /test]# gcc -shared -o funcs.so funcs.o

[root@Treazurac /test]# psql -f funcs.sql -d trdata
DROP
CREATE

[root@Treazurac /test]# psql trdata
Welcome to psql, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help on internal slash commands
       \g or terminate with semicolon to execute query
       \q to quit

trdata=# select concat_text('a','b');
 concat_text
-------------
 ab
(1 row)

trdata=#
-----------------------------------------------------------------------------

so now I do not understand why the "gcc" version works and the "g++" version
does not?

Just a side note in that I can easliy compile c++ the examples in the
interfaces/libpq++ directory without any problems so that this is very strange
to me.

I really need the "g++" version to work correctly as well?

Any ideas on how to fix this so that I can use c++ functions compiled with g++
in the PL/pgSQL extensions?

Cheers
Lonnie


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