On 64-bit HPUX, gdb fails to compile with -Werror because of an 
incorrect iconv() prototype. gdb's configure script checks for this, but 
because the configure script test is compiled without -Werror even when 
-Werror is enabled, the test doesn't detect the condition properly. The 
attached patch forces this test to use the value of WERROR_CFLAGS so 
that the check uses the same flags that will be used to build gdb.

tbh I think this is really a hack and we should somehow make all the 
autoconf test use the -Werror flag when running the compile tests, but 
it's not obvious to me how I can do this without redoing a lot of the 
Makefile logic (for example, why do we use a separate WERROR_CFLAGS and 
not just append the -Werror into CFLAGS?)...

Anyway, is this ok? Tested on hppa64-hp-hpux11.11; may also help other 
archs that need ICONV_CONST to be defined.

randolph