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Debugging PostgreSQL with GDB

From: "Manolo SupaMA" <manolo(dot)espa(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Debugging PostgreSQL with GDB
Date: 2008-04-01 15:35:53
Message-ID: 7a32fc660804010835j123c61f1s92b9862dd5bee713@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Hi.

I have problems on how to debug PostgreSQL on Linux using GDB. I made some
changes to src/backend/utils/sort/tuplesort.c but it hangs while performing
run formation (where my changes are).

I configured it using

./configure --prefix="/usr/local/pgsql/8.3/" CFLAGS="-O0 -DTRACE_SORT"
--enable-debug --enable-cassert --enable-depend

and trying to debug it using

'gdb postmaster'
(which revealed to be not a very good idea) and
'gdb pg_ctl' followed by 'run -D /usr/local/psql/data'

This last choice allowed me to set a breackpoint on puttuple_common
(contained into tuplesort.c) but then I'm unable to run 'psql'.
http://pastebin.com/m6a97b4dd

I'm new on GDB and it's also my first postgrest patch. I just want some
suggestion to know if I'm on the right way or not.

Thanks for your time.

PS: I suppose I'll write some related  "HowTo Debug PostgreSQL with GDB -
Basics" for newbies like me.

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