Re: AC_USE_SYSTEM_EXTENSIONS should be AC_DEFUN_ONCEd

[Eric Blake]

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According to Bruno Haible on 1/25/2009 4:42 AM:
> Hi,
> 
> Assuming the new semantics of AC_DEFUN_ONCE proposed by Paolo Bonzini and
> Eric Blake, I think the macro AC_USE_SYSTEM_EXTENSIONS should be defined
> through AC_DEFUN_ONCE.

Agreed, and so should many other functions.  But let's get AC_DEFUN_ONCE
fixed and backported to gnulib before scrubbing autoconf macros for
one-shot semantics.

> For 2.64, defining AC_USE_SYSTEM_EXTENSIONS through AC_DEFUN_ONCE should fix
> all these problems, IMO. But feel free to add these 4 test cases to the test
> suite nevertheless :-)

Yes, the existing tests for AC_USE_SYSTEM_EXTENSIONS should be expanded as
part of the fix.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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