Re: [Bug-gnulib] onceonly.m4 quoting fixes

[Bruno Haible]

Paul Eggert writes:

> Yes, but I thought that onceonly.m4 was imported unmodified from a
> package that wanted to run on older Autoconf versions.

No, I wrote onceonly.m4 from scratch. I've added an AC_PREREQ now to
make things clearer.

> So you have two versions of onceonly.m4, then, one
> for older Autoconf versions and one for newer?

The onceonly_2_57.m4 has the advantage that it produces smaller
configure files, but it uses several undocumented internals of
autoconf. Therefore it may break sometime in the future, and then
we'll have to fall back on onceonly.m4 which is not so much optimized.

> In that case, there are some other minor changes that should be made
> to the newer onceonly.m4.  The code should use m4_defn, not defn, and
> similarly for the other builtin m4 macros.

Would be good. But I'm not so familiar with these m4_* macros.

Bruno