hpux build errors, and -Werror

hpux build errors, and -Werror

[Randolph Chung]

Currently on hppa64-hp-hpux11.11, gdb fails to build with -Werror 
because we are not getting the const flag correct with iconv() calls.

gdb's configure script actually has some tests for this, from 
acinclude.m4, however, the test doesn't actually work (at least in this 
case), because configure doesn't compile the test program with -Werror, 
and the resultant warning doesn't trigger the script to define ICONV_CONST

I'm not very good with autoconf & friends and can't figure out the right 
way to fix it. Can somebody give me some hints?

On hppa2.0w-hp-hpux11.11, there is a different problem, at least on the 
system I'm testing on:

ser-tcp.c:209 has a call to getsockopt. This causes a (fatal) warning:
../../gdb/gdb/ser-tcp.c:209: warning: passing arg 5 of `getsockopt' from 
incompatible pointer type

getsockopt is declared as:
extern int getsockopt (int, int, int, void *, int *);
whereas socklen_t is:
typedef long unsigned int size_t
typedef size_t socklen_t;

I would argue the headers are broken on this platform, but nonetheless 
we may need to find a way to workaround this in gdb. I can't think of 
any good way to do this though.

Comments appreciated.

randolph