On 3/13/08, Ralf Wildenhues <Ralf.Wildenhues@xxxxxx> wrote: > * NightStrike wrote on Thu, Mar 13, 2008 at 09:20:06PM CET: > > Should AS_CASE (http://www.gnu.org/software/autoconf/manual/autoconf.html#index-AS_005fCASE-1116) > > always be used instead of case/esac inside configure.ac, some local > > package m4 script, or AC_DEFUN macros? > > Most of the time that is purely an aesthetic question. > > It however matters if, inside AS_CASE arguments, you put > AC_DEFUN'ed macros which themselves AC_REQUIRE other macros. > They will then be expanded outside of the AS_CASE construct. > > Example: > > AC_INIT > AC_DEFUN([FOO], [echo foo]) > AC_DEFUN([BAR], [AC_REQUIRE([FOO]) > echo bar]) > x=zork > AS_CASE([$x], [y*], [BAR]) > > > will print 'foo' because FOO will be expanded outside of the AS_CASE. > > Note that with AS_IF of Autoconf's 2.61 and newer, the same holds > (before 2.61, AS_IF was not m4_defun'ed, only m4_define'd, so the > expansion of required macros was not pushed outside of it). I'm trying to follow this logic, but I'm not putting it together in my head. Why isn't the result nothing? I would think (probably incorrectly) that the AS_CASE becomes this: case $x in y*) echo foo; echo bar; ;; esac _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
