Functions used by init before defined

[jeremy]

Hi,

I'm having a strange issue with Autoconf which involves a few built-in
functions. They are not being found. Basically, if I run autoconf on my
configure.in it complains about that as_fn_set_status and as_fn_exit are not
being defined. Looking in the generated configure script, indeed these are
used at the top but defined at the bottom. They are used very early in the
script, apparently by the call to AC_INIT. So my (very hacky) solution is
simply inserting these two functions at the top of the script, and then the
script runs fine. Now, on the other hand, I have another configure.in
script that seems to work fine with the same Autoconf version, so I am a bit
confused.

It was also somewhat confusing that copying these methods and putting them
at the top of my configure.in script did not seem to do anything as they are
apparently ignored and defined in the same place in the output regardless.

So, I guess my questions are:

What are the possible causes of this misordering?

Is it my fault or Autoconf's?

What is the best way to make sure this doesn't happen?

My Autoconf is 2.69 with m4 1.4.16 and automake 1.12.6, which I think are
all the most current versions.

Thanks.

--Jeremy




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[Eric Blake]

Post by jeremy
Hi,
I'm having a strange issue with Autoconf which involves a few built-in
functions. They are not being found. Basically, if I run autoconf on my
configure.in it complains about that as_fn_set_status and as_fn_exit are not

The file name configure.in is deprecated; hence I'm referring to
configure.ac.

Post by jeremy
being defined. Looking in the generated configure script, indeed these are
used at the top but defined at the bottom. They are used very early in the
script, apparently by the call to AC_INIT. So my (very hacky) solution is
simply inserting these two functions at the top of the script, and then the
script runs fine. Now, on the other hand, I have another configure.in
script that seems to work fine with the same Autoconf version, so I am a bit
confused.

I'd have to see the two configure.ac scripts to compare them, before I
could say whether it is a usage error on your part or a bug in autoconf
itself. Can you post them? I suspect that you have something going on
with diversions that ends up causing things to be placed in the wrong
diversion, at which point the resulting configure file appears out of
order with a use of the function in one diversion before the definition
of the function in another diversion.

Post by jeremy
It was also somewhat confusing that copying these methods and putting them
at the top of my configure.in script did not seem to do anything as they are
apparently ignored and defined in the same place in the output regardless.

In autoconf, AC_INIT has to come first. Anything appearing before
AC_INIT is treated as going to diversion -1; so while it might affect m4
definitions, it is not carried through to the resulting configure file.
That would explain why pasting the functions in your configure.ac
earlier than AC_INIT didn't make a difference.

[jeremy]

Hi, Eric.

I am not sure about pasting in my configure.ac as my usage of Autoconf is a
bit "wild." I do suspect that something changed within Autoconf itself, as
my scripts worked fine with 2.53 but the problems started occurring after I
upgraded to 2.69 which is the latest. I use a lot of includes via
aclocal.m4 to pull in macros that I define. Could this have anything to do
with it?

In the meantime, I'll work on trying to get the smallest possible example
that shows this problem. You really don't want to look at my full script.

--Jeremy


On Mon, Apr 8, 2013 at 6:21 PM, Eric Blake-3 [via Gnu - Autoconf] <

Post by jeremy

Post by jeremy
Hi,
I'm having a strange issue with Autoconf which involves a few built-in
functions. They are not being found. Basically, if I run autoconf on

my

Post by jeremy
configure.in it complains about that as_fn_set_status and as_fn_exit

are not
The file name configure.in is deprecated; hence I'm referring to
configure.ac.

Post by jeremy
being defined. Looking in the generated configure script, indeed these

are

Post by jeremy
used at the top but defined at the bottom. They are used very early in

the

Post by jeremy
script, apparently by the call to AC_INIT. So my (very hacky) solution

is

Post by jeremy
simply inserting these two functions at the top of the script, and then

the

Post by jeremy
script runs fine. Now, on the other hand, I have another configure.in
script that seems to work fine with the same Autoconf version, so I am a

bit

Post by jeremy
confused.

I'd have to see the two configure.ac scripts to compare them, before I
could say whether it is a usage error on your part or a bug in autoconf
itself. Can you post them? I suspect that you have something going on
with diversions that ends up causing things to be placed in the wrong
diversion, at which point the resulting configure file appears out of
order with a use of the function in one diversion before the definition
of the function in another diversion.

Post by jeremy
It was also somewhat confusing that copying these methods and putting

them

Post by jeremy
at the top of my configure.in script did not seem to do anything as

they are

Post by jeremy
apparently ignored and defined in the same place in the output

regardless.
In autoconf, AC_INIT has to come first. Anything appearing before
AC_INIT is treated as going to diversion -1; so while it might affect m4
definitions, it is not carried through to the resulting configure file.
That would explain why pasting the functions in your configure.ac
earlier than AC_INIT didn't make a difference.
--
Eric Blake eblake redhat com [phone]
Libvirt virtualization library http://libvirt.org
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