Re: [patch/rfc] Eliminate TARGET_HAS_HARDWARE_WATCHPOINTS

["Eli Zaretskii" <eliz@gnu.org>]

> Date: Thu, 9 Sep 2004 08:47:56 -0400
> From: Daniel Jacobowitz <drow@false.org>
> Cc: cagney@gnu.org, gdb-patches@sources.redhat.com
> 
> > I understand the theory, I just don't know how to test for watchpoint
> > support in a program by just compiling it.  If you can suggest a
> > program whose compilation will reveal that, please do.
> 
> There's nothing generic controlled by TARGET_HAS_HARDWARE_WATCHPOINTS.
> It controls an include of <sys/debugreg.h> in i386v-nat.c - that can be
> autoconf'd, and then checked for the appropriate DR_* constants if
> that's necessary.  It controls the use of prwatch_t in procfs.c,
> likewise.

I'm not sure the mere presence of DR_* automatically means that
hardware watchpoints are supported at run time.  I'd prefer to hear
that from Mark or someone else who could tell for sure.

In any case, if the above is true, then there should be no problem to
write an Autoconf test that would replace
TARGET_HAS_HARDWARE_WATCHPOINTS.  As soon as that is posted here, I
will withdraw all my objections to removing the old macro in favor of
the new mechanism.