compile warnings in HEAD

I get the following warnings compiling current sources:

/Users/neilc/pgsql/src/bin/pg_dump/pg_backup_db.c: In function 
`_isIdentChar':
/Users/neilc/pgsql/src/bin/pg_dump/pg_backup_db.c:874: warning: 
comparison is always true due to limited range of data type
/Users/neilc/pgsql/src/bin/pg_dump/pg_backup_db.c: In function `_isDQChar':
/Users/neilc/pgsql/src/bin/pg_dump/pg_backup_db.c:891: warning: 
comparison is always true due to limited range of data type

Default CFLAGS. Machine specs:

[neilc:/Users/neilc/build-pgsql]% gcc -v
Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs
Thread model: posix
gcc version 3.3 20030304 (Apple Computer, Inc. build 1495)
[neilc:/Users/neilc/build-pgsql]% uname -a
Darwin CPE000a95ab279e-CM000a735d27c0 7.5.0 Darwin Kernel Version 7.5.0: 
Thu Aug  5 19:26:16 PDT 2004; root:xnu/xnu-517.7.21.obj~3/RELEASE_PPC 
Power Macintosh powerpc

(i.e. OSX 10.3.5)

-Neil