On Aug 7, 2000, Akim Demaille <[EMAIL PROTECTED]> wrote:
> | ifndef([AC_NO_EXECUTABLES],[
> | AC_DEFUN([AC_NO_EXECUTABLES],[
> Ahem, `AC_' is somewhat reserved to Autoconf :)
Precisely. I'm suggesting autoconf to supply AC_NO_EXECUTABLES, and
we'd be using this fallback definition only with older releases of
autoconf.
> I'm not too fond of this scheme: it is greatly bound to the internals
> of Autoconf.
It has to be, with autoconf 2.13, because there are not ``externals''
that make it possible. That's precisely what I'd like to fix in
the next release.
> | Now we (the GCC folks) have two problems. We'd like to have this
> | supported by the next release of autoconf
> Can we imagine an approach based on finger grained macros? What is it
> that you still want to run in what an AC_PROG_COMPILER is:
> 1. Looking for the executable
> 2. checking that it works
> 3. checking that it's GNU
> 4. checking that it support -g
> 5. setting EXEEXT and OBJEXT.
> Would it be enough to just extract 1. from AC_PROG_CC?
No. What we need now is to be able to skip 2 and 5, or parts of them,
because we can't assume the compiler is able to link.
> | Any ideas about how to selectively disable AC_TRY_LINK, to use in
> | AC_NO_CXX_EXECUTABLES? Any suggestions about naming conventions for
> | these macros?
> How about something as hacky as this:
I was thinking of something like:
define([AC_TRY_LINK],[ifelse([_AC_LANG],[C],[My def],]defn([AC_TRY_LINK])[)])
but how can something like this be made to work? The problem is the
incomplete `ifelse' and unmatched parens. Can anything like this be
reworked in a way m4 accepts it? Or is m4 supposed to accept it as I
wrote? (I haven't tested, just assumed it was wrong :-)
We don't really need it this way; just issuing an m4_error and closing
the ifelse would be enough, but it would be nice to avoid the linking
step completely.
--
Alexandre Oliva Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist *Please* write to mailing lists, not to me
