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Re: could not setup config headers machinery

From: Eric Blake
Subject: Re: could not setup config headers machinery
Date: Mon, 25 Oct 2010 12:15:17 -0600
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100921 Fedora/3.1.4-1.fc13 Mnenhy/0.8.3 Thunderbird/3.1.4

On 10/23/2010 10:25 AM, Dr. David Kirkby wrote:
On 10/14/10 09:02 PM, Ralf Wildenhues wrote:

checking for IEEE denormalized values... yes
configure: creating ./config.status
config.status: error: invalid argument: `Makefile.'

Can you send 'diff -u' of the two configure files (without above line
and with)? Of even of the one with float.h and the one with math.h?

Sure. First here's the diff between the files


What is also interesting is the difference between that which looks in
the math.h file and that which looks in the float.h file:


address@hidden:~/gsl-1.14$ diff -u
--- Sat Oct 23 16:55:44 2010
+++ Sat Oct 23 16:54:20 2010
@@ -197,7 +197,7 @@
AC_CHECK_DECLS(atanh,,,[#include <math.h>])
AC_CHECK_DECLS(ldexp,,,[#include <math.h>])
AC_CHECK_DECLS(frexp,,,[#include <math.h>])
-AC_CHECK_DECLS([fprnd_t],[],[],[[#include <math.h>]])
+AC_CHECK_DECLS([fprnd_t],[],[],[[#include <float.h>]])

I'm wondering if we are tripping on some sort of length-based bug (that is, in the past, we have evidence where some shells mishandle here-docs that contain a ${...} expansion across a page boundary; maybe this is a similar case). If it is indeed a length-based bug, does adding one more byte in the <math.h> approach also make the bug appear?

> -AC_CHECK_DECLS([fprnd_t],[],[],[[#include <math.h>]])
> +AC_CHECK_DECLS([fprnd_t],[],[],[[#include  <math.h>]])

And if so, it would be really nice to figure out which here-doc (or whatever other length-based problem) we are tripping over, so we can hopefully find a way to refactor code to avoid it.

Also, to be clear, what versions of sed and awk are being used, and is configure settling on /bin/sh or falling back on a more featured shell like bash?

Could this be a gcc bug, which is actually causing the configure script
to fail?

Does the config.log give any more evidence on the matter? In particular, what did HAVE_DECL_FPRND_T get set to in confdefs.h?

The reason I'm thinking this is because it seems to be a gcc bug that
the fprnd_t is not being defined on the AIX system. If fprnd_t was
defineded properly, I would not need to be testing for this at all. It
seems a bug thats it not defined, since it is clearly defined in

fprnd_t is a non-standard type, so gcc is within its rights to not declare it (although if you haven't raised a gcc bug that their <float.h> should #include_next the AIX system <float.h>, now would be a good time to do so). That is, gcc need not provide anything beyond what is documented on this page of POSIX:

although QoI suggest they should support all extensions also provided by the vendor.

It looks to me like this is a gcc bug, but I'm puzzled why it can result
in a problem with the autoconf generated script.

As am I.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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