The autoconf manual has the following example for AS_HELP_STRING:
AC_DEFUN([TEST_MACRO],
[AC_ARG_WITH([foo],
AS_HELP_STRING([--with-foo],
[use foo (default is NO)]),
[ac_cv_use_foo=$withval], [ac_cv_use_foo=no])
AC_CACHE_CHECK([whether to use foo],
[ac_cv_use_foo], [ac_cv_use_foo=no])])
I've seen this idiom of using AC_CACHE_CHECK after AC_ARG_ENABLE and
ACE_ARG_WITH elsewhere, but I do not really understand what benefits
caching brings. For example, in the above ac_cv_use_foo is going to
be set one way or the other before the call to AC_CACHE_CHECK, so the
COMMANDS-TO-SET-IT will never be invoked.
If the point is to print a message, why not use something like:
AC_MSG_CHECKING([whether to use foo])
AC_MSG_RESULT($ac_cv_use_foo)
?
--jtc
--
J.T. Conklin
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