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Re: Fix for compiling m4 on VAX

From: John Klos
Subject: Re: Fix for compiling m4 on VAX
Date: Wed, 30 Oct 2013 23:08:41 +0000 (UTC)


This change needs to be incorporated upstream in gnulib (cc'd); from
there it will find its way into the next m4 release.

Thank you.

What compiler is being used, and what macros does this compiler

gcc (GCC) 4.1.3 20080704 prerelease (NetBSD nb3 20111107)
The common relevant macros are __vax__ (for OpenBSD, too - no idea about GNU/Linux or if that port even exists any more) and, of course, __NetBSD__.

More generally:

Why is the change needed?  What happens, exactly, if you don't
have the change?

The VAX doesn't have NaNs at all, right?  So that section of
code shouldn't be compiled at all: isnan should simply return
0 without inspecting its argument.  That is the real bug that
needs to get fixed here.

Without it, compiling m4 fails:

And yes, VAXen have no NaNs, so yes, isnan would never possibly return true on VAX.

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