[m-rev.] for review: add MR_ prefixes to configuration macros

[Simon Taylor]

On 11-Feb-2002, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> On 09-Feb-2002, Simon Taylor <stayl at cs.mu.OZ.AU> wrote:
> > 
> > Add MR_ prefixes to the configuration macros. This change only
> > adds prefixes to the definitions of the macros, not the uses.
> ...
> > Index: configure.in
> ...
> > +mercury_check_for_functions () {

> According to the autoconf manual, "you should not use shell functions",
> because they are not portable.  I'm not sure how important that is
> these days, but I've used at least one shell which didn't support them.
> We've also taken some effort to avoid using them in scripts/*.in.

configure.in already contains a shell function (check_c_files).
When that was added, you wrote:

   However, I spent a bit of time investigating the issue.
   The Posix shell standard includes support for shell functions.
   They also work OK with all the main free software shells --  
   bash, ash, and ksh. Apparently the platform whose
   default shell doesn't support them is Ultrix.

   Portability to Ultrix is no longer very important.
   And for Ultrix, we can always tell people to use bash
   to run configure. So I think this is OK.

Simon.
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