[m-rev.] for review: add --output-cflags option

[Julien Fischer]

On Fri, 25 Jan 2008, Julien Fischer wrote:

> Estimated hours taken: 1.5
> Branches: main
>
> Add a new option, `--output-cflags', that causes the compiler to print
> out the flags it will pass to the C compiler.  This addition is intended
> to simplify the use of stand-alone interfaces and remove their current
> dependence on the mgnuc script.
>
> The idea is that users who have C files that make calls to exported
> Mercury code should be able to add something like the following to
> their Makefiles,
>
> 	CC := $(shell mmc --output-cc)
> 	CFLAGS := $(shell mmc --output-cflags)
>
> CFLAGS will then contain the appropriate -I and -D options to process the
> code in any Mercury headers #included in the C file.
>
> XXX we also need something similar for linking.  The documentation and
> samples for stand-alone interfaces also need to be updated.  I will do
> both of those things as separate changes.
>
> compiler/options.m:
> 	Add the --output-cflags option.
>
> compiler/mercury_compile.m:
> 	Implement the option.
>
> compiler/compile_target_code.m:
> 	Factor out the code that determines what flags are passed to the
> 	C compiler, based on grade settings and alike, into a separate
> 	predicate, gather_c_compiler_flags/4.
>
> 	Export a new predicate, output_c_compiler_flags/3, that is
> 	called when --output-cflags is given.  This predicate just
> 	prints out the result of gather_c_compiler_flags/4 to the
> 	specified output stream.
>
> doc/user_guide.texi:
> 	Document the new option.

I've committed this, as I need it to be installed in order to continue
work on some G12 stuff.  I'll deal with any review comments separately.

Julien.
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