| 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.
Ah! Sorry, I misunderstood.
| > 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.
Are you saying you are looking for a 2.13 and 2.50 compatible
solution? Why? Why not have 2.50 do exactly what you need instead of
trying to have something which fits with 2.13 too?
| > 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.
Really, I dislike macros which change some state, and change the
semantics of other macros. For one, it makes --trace lie. We'd
better find exactly what is the grain you need, and provide the
equivalent macros.
| > | 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 :-)
What do you dislike in my proposal? It's basically the same, but more
Autoconf like, and more scalable. You can
define([AC_TRY_LINK(C)],
[All my stuff
AC_TRY_LINK_ORIGINAL(Some, more, stuff)])
etc.
| 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.
define([AC_TRY_LINK(C)],
[m4_error([no you don't!])])
