for review: add `--debug' grade

[Fergus Henderson]

On 20-May-1998, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> Add a `--debug' option for Mercury-level debugging
> using the trace-based debugger.

Here's some additional changes that I will commit with those:

scripts/mgnuc.in:
compiler/mercury_compile.m:
doc/user_guide.texi:
	Change things so that `--c-debug' does not imply `--no-c-optimize'.

configure.in:
	Add `-fomit-frame-pointer' to CFLAGS_FOR_GOTOS on alpha-*.
	Empirically, this seems to be needed, otherwise lots of
	the test cases fail when compiled with `--no-c-optimize'.
	(It might also be needed for other architectures, I don't know.)

I can supply a diff if anyone wants it.

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.