Thread: undefined reference to `PQprepare' with postgresql-dev 7.4.7-6sarge2
Hello,
I'm trying to compile a libpq program under Debian 3.1r2 with these
packages installed:
$ dpkg -l | grep postgres
ii postgresql 7.4.7-6sarge2 object-relational SQL database management sy
ii postgresql-cli 7.4.7-6sarge2 front-end programs for PostgreSQL
ii postgresql-con 7.4.7-6sarge2 additional facilities for PostgreSQL
ii postgresql-dev 7.4.7-6sarge2 development files for libpq (PostgreSQL libr
ii postgresql-doc 7.4.7-6sarge2 documentation for the PostgreSQL database ma
That program compiles and works fine with OpenBSD
and Cygwin (I'm using PostgreSQL 8.x there though...)
On Debian it unfortunately doesn't link:
$ gcc build/pref.o build/message.o build/pgsql.o build/user.o
build/util.o build/table.o build/common.o build/array.o
build/xstring.o build/strlcpy.o build/strlcat.o build/daemon.o -o pref
-L /usr/lib -L /usr/lib/postgresql/lib -lpq
build/pgsql.o(.text+0x15b): In function `db_prepare':
server/pgsql.c:57: undefined reference to `PQprepare'
collect2: ld returned 1 exit status
$ pg_config --version
PostgreSQL 7.4.7
$ pg_config --libdir
/usr/lib
$ objdump -x /usr/lib/libpq.a | grep -i PQprepare
00000000 *UND* 00000000 pqPrepareAsyncResult
00001974 R_386_PLT32 pqPrepareAsyncResult
00000490 g F .text 0000007d pqPrepareAsyncResult
000012e5 R_386_PLT32 pqPrepareAsyncResult
0000130a R_386_PLT32 pqPrepareAsyncResult
00000000 *UND* 00000000 pqPrepareAsyncResult
00001841 R_386_PLT32 pqPrepareAsyncResult
There are very few hits for the "undefined reference PQprepare"
on Google (which I take a good sign :-)
Does anybody have an idea please, what could I be doing wrong?
Why doesn't objdump find PQprepare, but finds PQconnectdb?
$ objdump -x /usr/lib/libpq.a | grep -i PQconnectdb
00000000 g F .text 00000042 PQconnectdb
Thank you
Alex
PS: And here is the code failing to link (my server/pgsql.c)
probably nothing special:
#define DB_CONN_STR "host=/tmp user=XXX dbname=XXX"
#define SQL_FETCH_USER \
"select username, user_avatar from phpbb_users where user_active = 1 " \
"and user_id = $1 and user_password = $2 and user_id not in " \
"(select ban_userid from phpbb_banlist where ban_userid is not null)"
......
static void
db_reconnect()
{
PQreset(conn);
if (PQstatus(conn) != CONNECTION_OK) {
warn("Connection to db '%s' failed: %s",
DB_CONN_STR, PQerrorMessage(conn));
sleep(RETRY_INTERVAL);
return;
}
db_prepare("sql_fetch_user", SQL_FETCH_USER, 2);
}
void
db_prepare(const char *stname, const char *query, int nparams)
{
PGresult* res;
res = PQprepare(conn, stname, query, nparams, NULL);
if (PQresultStatus(res) != PGRES_COMMAND_OK) {
PQclear(res);
db_disconnect();
die("Preparing statement '%s' failed: %s",
query, PQerrorMessage(conn));
}
PQclear(res);
}
......
--
http://preferans.de
Alexander Farber wrote: > Hello, > > I'm trying to compile a libpq program under Debian 3.1r2 with these > packages installed: > > $ dpkg -l | grep postgres > ii postgresql 7.4.7-6sarge2 object-relational SQL database > management sy > ii postgresql-cli 7.4.7-6sarge2 front-end programs for PostgreSQL > ii postgresql-con 7.4.7-6sarge2 additional facilities for PostgreSQL > ii postgresql-dev 7.4.7-6sarge2 development files for libpq > (PostgreSQL libr > ii postgresql-doc 7.4.7-6sarge2 documentation for the PostgreSQL > database ma > > That program compiles and works fine with OpenBSD > and Cygwin (I'm using PostgreSQL 8.x there though...) > > On Debian it unfortunately doesn't link: > > $ gcc build/pref.o build/message.o build/pgsql.o build/user.o > build/util.o build/table.o build/common.o build/array.o > build/xstring.o build/strlcpy.o build/strlcat.o build/daemon.o -o pref > -L /usr/lib -L /usr/lib/postgresql/lib -lpq > build/pgsql.o(.text+0x15b): In function `db_prepare': > server/pgsql.c:57: undefined reference to `PQprepare' > collect2: ld returned 1 exit status > > $ pg_config --version > PostgreSQL 7.4.7 > > $ pg_config --libdir > /usr/lib > > $ objdump -x /usr/lib/libpq.a | grep -i PQprepare > 00000000 *UND* 00000000 pqPrepareAsyncResult > 00001974 R_386_PLT32 pqPrepareAsyncResult > 00000490 g F .text 0000007d pqPrepareAsyncResult > 000012e5 R_386_PLT32 pqPrepareAsyncResult > 0000130a R_386_PLT32 pqPrepareAsyncResult > 00000000 *UND* 00000000 pqPrepareAsyncResult > 00001841 R_386_PLT32 pqPrepareAsyncResult > > There are very few hits for the "undefined reference PQprepare" > on Google (which I take a good sign :-) > > Does anybody have an idea please, what could I be doing wrong? there is no PQprepare in 7.4 - it got introduced in 8.0 (it is not mentioned in the 7.4 manual either) ... Stefan
Re: undefined reference to `PQprepare' with postgresql-dev 7.4.7-6sarge2
From
"Alexander Farber"
Date:
I've also checked http://www.postgresql.org/docs/7.4/interactive/libpq-exec.html and PQprepare() isn't mentioned there at all. Wasn't it provided in PostgreSQL version 7? Is there a way to workaround it? Maybe by using pqPrepareAsyncResult()? And how could I #ifdef in my libpq-program, to detect an older PostgreSQL version? The headers /usr/include/postgresql/libpq-fe.h and /usr/include/postgresql/postgres_ext.h don't have any PG_VERSION or similar define... On 8/24/06, Alexander Farber <alexander.farber@gmail.com> wrote: > I'm trying to compile a libpq program under Debian 3.1r2 with these > packages installed: > > $ dpkg -l | grep postgres > ii postgresql 7.4.7-6sarge2 object-relational SQL database management sy > ii postgresql-cli 7.4.7-6sarge2 front-end programs for PostgreSQL > ii postgresql-con 7.4.7-6sarge2 additional facilities for PostgreSQL > ii postgresql-dev 7.4.7-6sarge2 development files for libpq (PostgreSQL libr > ii postgresql-doc 7.4.7-6sarge2 documentation for the PostgreSQL database ma > > On Debian it unfortunately doesn't link: > > $ gcc build/pref.o build/message.o build/pgsql.o build/user.o > build/util.o build/table.o build/common.o build/array.o > build/xstring.o build/strlcpy.o build/strlcat.o build/daemon.o -o pref > -L /usr/lib -L /usr/lib/postgresql/lib -lpq > build/pgsql.o(.text+0x15b): In function `db_prepare': > server/pgsql.c:57: undefined reference to `PQprepare' > collect2: ld returned 1 exit status > > $ pg_config --version > PostgreSQL 7.4.7 > > $ pg_config --libdir > /usr/lib > > $ objdump -x /usr/lib/libpq.a | grep -i PQprepare > 00000000 *UND* 00000000 pqPrepareAsyncResult > 00001974 R_386_PLT32 pqPrepareAsyncResult > 00000490 g F .text 0000007d pqPrepareAsyncResult > 000012e5 R_386_PLT32 pqPrepareAsyncResult > 0000130a R_386_PLT32 pqPrepareAsyncResult > 00000000 *UND* 00000000 pqPrepareAsyncResult > 00001841 R_386_PLT32 pqPrepareAsyncResult > > There are very few hits for the "undefined reference PQprepare" > on Google (which I take a good sign :-) > > Does anybody have an idea please, what could I be doing wrong? > > Why doesn't objdump find PQprepare, but finds PQconnectdb? > > $ objdump -x /usr/lib/libpq.a | grep -i PQconnectdb > 00000000 g F .text 00000042 PQconnectdb > > Thank you > Alex > > PS: And here is the code failing to link (my server/pgsql.c) > probably nothing special: > > #define DB_CONN_STR "host=/tmp user=XXX dbname=XXX" > #define SQL_FETCH_USER \ > "select username, user_avatar from phpbb_users where user_active = 1 " \ > "and user_id = $1 and user_password = $2 and user_id not in " \ > "(select ban_userid from phpbb_banlist where ban_userid is not null)" > ...... > static void > db_reconnect() > { > PQreset(conn); > > if (PQstatus(conn) != CONNECTION_OK) { > warn("Connection to db '%s' failed: %s", > DB_CONN_STR, PQerrorMessage(conn)); > sleep(RETRY_INTERVAL); > return; > } > > db_prepare("sql_fetch_user", SQL_FETCH_USER, 2); > } > > void > db_prepare(const char *stname, const char *query, int nparams) > { > PGresult* res; > > res = PQprepare(conn, stname, query, nparams, NULL); > if (PQresultStatus(res) != PGRES_COMMAND_OK) { > PQclear(res); > db_disconnect(); > die("Preparing statement '%s' failed: %s", > query, PQerrorMessage(conn)); > } > > PQclear(res); > } > ...... -- http://preferans.de
"Alexander Farber" <alexander.farber@gmail.com> writes:
> Does anybody have an idea please, what could I be doing wrong?
Trying to use a subroutine added in 8.0 in 7.4.
regards, tom lane
Re: undefined reference to `PQprepare' with postgresql-dev 7.4.7-6sarge2
From
"Alexander Farber"
Date:
Yes, I'm sorry I didn't expect that it wasn't there (coming to libpq-programming from Perl, where there is always a prepare() function) How could I detect (#ifdef WHAT) an older PostgreSQL version in my C-code? And is there maybe an easy workaround for a missing PQprepare? On 8/24/06, Tom Lane <tgl@sss.pgh.pa.us> wrote: > "Alexander Farber" <alexander.farber@gmail.com> writes: > > Does anybody have an idea please, what could I be doing wrong? > > Trying to use a subroutine added in 8.0 in 7.4. Regards Alex -- http://preferans.de
Re: undefined reference to `PQprepare' with postgresql-dev 7.4.7-6sarge2
From
"Alexander Farber"
Date:
Ok, I've upgraded to: $ dpkg -l | grep postgres ii postgresql-8.1 8.1.4-4bpo1 object-relational SQL database, version 8.1 ii postgresql-cli 8.1.4-4bpo1 front-end programs for PostgreSQL 8.1 ii postgresql-cli 57bpo1 manager for multiple PostgreSQL client versi ii postgresql-com 57bpo1 manager for PostgreSQL database clusters ii postgresql-con 8.1.4-4bpo1 additional facilities for PostgreSQL ii postgresql-doc 8.1.4-4bpo1 documentation for the PostgreSQL database ma $ dpkg -l | grep pq ii libpq-dev 8.1.4-4bpo1 header files for libpq4 (PostgreSQL library) ii libpq4 8.1.4-4bpo1 PostgreSQL C client library using http://www.backports.org/dokuwiki/doku.php and now my program compiles and PQprepare is there: $ objdump -x /usr/lib/libpq.a | grep -iw PQprepare 000016a0 g F .text 00000086 PQprepare Regards Alex -- http://preferans.de