Re: restrict.m4: do not punish autoconf 2.59 users

[Stepan Kasal]

Hello,

>  AC_DEFUN([gl_C_RESTRICT],
> -[AC_CACHE_CHECK([for C/C++ restrict keyword], gl_cv_c_restrict,
> +[m4_ifdef([AC_C_RESTRICT], [AC_C_RESTRICT],
> +       [AC_CACHE_CHECK([for C/C++ restrict keyword], gl_cv_c_restrict,

perhaps

m4_ifndef([AC_C_RESTRICT],
AC_DEFUN([gl_C_RESTRICT],
[...]
])
])

could be better.

But: how many people are using current gnulib with Autoconf 2.57 or earlier?

I know it is only two releases behind the latest, but OTOH, it is
3 years old.

Current gnulib is mostly used for bootstraps of CVS checkouts, so I guess
requiring Autoconf 2.59 may not be a bad idea.

Have a nice day,
        Stepan Kasal