Hello,
On Wed, Oct 20, 2004 at 10:37:07AM +0200, Guus LEEUW wrote:
> > On Tue, Oct 19, 2004 at 01:40:05PM -0400, Yasunari Tosa wrote:
> > > Unfortunately AC_CHECK_PROG() nesting does not work:
> > >
> > > AC_CHECK_PROG([TIXWISH], [tixwish],[tixwish],
> > > [ AC_CHECK_PROG([TIXWISH], [tixwish8.1.8.3], [tixwish8.1.8.3],
> > > [AC_MSG_ERROR("FATAL: tixwish cannot be found")])
> > > ])
>
> What if Yasunari uses something (similar to|like) eval or backticks around
> the to-be-expanded macro?
> Is that going to be portable?
backticks can be a real pain, syntactically. All backticks and backslaskes
inside has to be escaped.
The POSIX replacement $(...) is not portable to some non-POSIX systems, eg.
the default configuration of current (recent?) Solaris.
``eval'' doesn't help here.
The only usable solution is to refrain from nesting of the macros:
AC_ARG_VAR([[TIXWISH]], [[The tixwish program.]])
AC_CHECK_PROG([[TIXWISH]], [[tixwish]], [[tixwish]])
if test "x$TIXWISH" = x; then
AC_CHECK_PROG([[TIXWISH]], [[tixwish8.1.8.3]], [[tixwish8.1.8.3]])
if test "x$TIXWISH" = x; then
AC_MSG_ERROR([[tixwish cannot be found]])
fi
fi
Regards,
Stepan Kasal
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