[m-rev.] for review: support using clang as a C compiler with Mercury

[Julien Fischer]

On Wed, 24 Aug 2011, Julien Fischer wrote:

> Branches: main, 11.07
>
> Support using clang as a C compiler with Mercury -- currently only
> tested on Mac OS X.
>
> Clean up the handling of C compilers in the configure script.
>
> configure.in:
> 	Improve this script's ability to distinguish between different
> 	types of C compiler.  In particular, ensure that a clear
> 	distinction is maintained between clang and gcc.
>
> 	Fix an old XXX: don't rely on pattern matching on the value
> 	of $CC to determine the C compiler type.  This is particularly
> 	error prone now since one compiler is named "clang" and another
> 	"cl".
>
> 	Set optimization and warning flags for clang.
> 	(XXX this is currently very conservative; we need to go through
> 	them and work out what good defaults might be.)
>
> 	Don't link against libgcc if we are using clang.
> 	(XXX I don't think this is really necessary for gcc either in
> 	the great majority of cases.)
>
> 	Mark spots that still need updating with "XXX CLANG"; I will
> 	look into these separately.
>
> aclocal.m4:
> 	Add a new macro that determines the C compiler type based
> 	on what builtin macros are defined -- unlike AC_PROG_CC
> 	this macro correctly distinguishes between gcc and clang.
>
> 	Add two new macros that determine version information for
> 	clang and for Visual C.
>
> scripts/mgnuc.in:
> scripts/ml.in:
> 	Handle clang as a C compiler.
>
> README.MacOS:
> 	Mention that clang can be used with Mercury on Mac OS X.

I've committed this one as I require it in order to work on other
changes - I will deal with any review comments separately.

Julien.
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