Possible to compile do_postgres with only libpq?

[luislavena]

Hello,

I'm trying to build binaries for libpq, the supposed to be client library of postgres that is small enough to be used on non-postgres installations.

Problem is that do_postgres depends on postgres.h headers that are not present when only using libpq interface.

It is possible change do_postgres to only use libpq interface option?

Thank you.

[dkubb]

@dbussink what do you think?

[dbussink]

Right now it's not possible, because we need postgres.h for mapping error code to the appropriate exceptions. At the time I wrote that I search for another way to do that, but the only way was to use the postgres.h header for it.

@luislavena Do you know of other ways to get the Postgres error codes with just using the libpq interface?

[deepfryed]

from utils/elog.h

 56 /* macros for representing SQLSTATE strings compactly */
 57 #define PGSIXBIT(ch)    (((ch) - '0') & 0x3F)
 58 #define PGUNSIXBIT(val) (((val) & 0x3F) + '0')
 59 
 60 #define MAKE_SQLSTATE(ch1,ch2,ch3,ch4,ch5)  \
 61     (PGSIXBIT(ch1) + (PGSIXBIT(ch2) << 6) + (PGSIXBIT(ch3) << 12) + \
 62      (PGSIXBIT(ch4) << 18) + (PGSIXBIT(ch5) << 24))

[dbussink]

If I look at the packaging of libpq-dev for example in Debian:

http://packages.debian.org/squeeze/amd64/libpq-dev/filelist

Here the postgres.h header and some additional ones that we use are also part of this list. I guess this is what usually ends up being the list that people require for writing a client. Therefore closing this issue, since I don't see DO being able to change this anytime soon.