compile warning

I'm seeing this compile warning on today's CVS tip:

$ make src/backend/commands/tablecmds.o
gcc -O2 -g -Wall -Wmissing-prototypes -Wmissing-declarations -I./src/include -D_GNU_SOURCE -c -o src/backend/commands/tablecmds.o src/backend/commands/tablecmds.c
src/backend/commands/tablecmds.c: In function `validateForeignKeyConstraint':
src/backend/commands/tablecmds.c:3528: warning: dereferencing type-punned pointer will break strict-aliasing rules

$ gcc --version
gcc (GCC) 3.3.1 (Mandrake Linux 9.2 3.3.1-2mdk)
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ src/bin/pg_config/pg_config --configure
'--enable-debug' '--enable-nls=es' '--enable-integer-datetimes'

--
Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
"In Europe they call me Niklaus Wirth; in the US they call me Nickel's worth.
That's because in Europe they call me by name, and in the US by value!"