Re: AC_SYS_LARGEFILE_REQUIRED vs. AC_SYS_YEAR2038_REQUIRED on MSVC

[Paul Eggert]

Thanks for looking into this.

> +[AC_REQUIRE([AC_CANONICAL_HOST])
Is there some way we can do this without requiring AC_CANONICAL_HOST? 
We're close to a release for Autoconf, and requiring this at the last 
minute for AC_SYS_LARGEFILE is a bit of a stretch.

That is, instead of AS_CASE([$host_os], ...) can  we use 
AC_PREPROC_IFELSE with the appropriate C preprocessor tests? Or perhaps 
do the AC_REQUIRE only if gl_LARGEFILE is defined?