Patrick Welche <[EMAIL PROTECTED]> writes: > I found the definition of AC_CYGWIN in lib/autoconf/specific.m4: > > # AC_CYGWIN > # --------- > # Check for Cygwin. This is a way to set the right value for > # EXEEXT.
You will notice that this does not set EXEEXT. > AU_DEFUN([AC_CYGWIN], > [AC_CANONICAL_HOST > AC_DIAGNOSE([obsolete], > [$0 is obsolete: use AC_CANONICAL_HOST and $host_os])dnl > case $host_os in > *cygwin* ) CYGWIN=yes;; > * ) CYGWIN=no;; > esac > ])# AC_CYGWIN > > > Several things I don't understand: google brought up an email which > esentially said "Don't use AC_REQUIRE inside AU_DEFUN", but then how > do you say "Only run AC_CANONICAL_HOST if it hasn't been run before". I think the point is that you shall not AC_REQUIRE inside an AU_DEFUN, but you can AC_REQUIRE inside an AC_DEFUN. Remember that an AU_DEFUN is expanded by autoupdate, so it should really only contain the old macro written in terms of the new one. > Also, AU_DEFUN (OLD-MACRO, IMPLEMENTATION, [MESSAGE]), so why use > AC_DIAGNOSE instead of [MESSAGE]? It seems that AC_CYGWIN has not been updated to take advantage of 3-argument AU_DEFUN. Hope this helps.
