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Re: snapshot in preparation for m4 1.4.12

From: Thomas Klausner
Subject: Re: snapshot in preparation for m4 1.4.12
Date: Sat, 23 Aug 2008 18:11:02 +0200

On Sat, Aug 23, 2008 at 10:06:29AM -0600, Eric Blake wrote:
> Expected; use './configure --enable-changeword' if you want that feature
> enabled in m4, with the caveat that it will be withdrawn in m4 2.0 (in
> favor of a more powerful and faster changesyntax feature).

Ok, I'll leave it disabled then.

> >> Thanks for the report.  Are you able to help us fix gnulib, by debugging
> >> where the replacement frexp went wrong?
> > 
> > When stepping through test-frexp with gdb, it fails like this:
> > (gdb) s
> > 113         ASSERT (signbit (mantissa));
> Thanks for the trace.  That occurs after the damage is already done; how
> about setting a breakpoint at line 110 (the call to frexp), and stepping
> through that?  Also, is rpl_frexp in use, or is gnulib deferring to your
> native frexp?

Breakpoint 1, main () at test-frexp.c:110
110         mantissa = frexp (x, &exp);
(gdb) s
111         ASSERT (exp == 0);
112         ASSERT (mantissa == x);
113         ASSERT (signbit (mantissa));
test-frexp.c:113: assertion failed
rpl_fflush (stream=0x502830) at fflush.c:100
100     fflush.c: No such file or directory.
        in fflush.c

Seems it's using NetBSD's native frexp.
I just retested 1.4.11 and it now fails there as well, so perhaps
something changed in NetBSD since my previous test (a few months ago).

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