Add --enable-fast-check to configure?

[Marek Polacek]

On Tue, Sep 11, 2012 at 05:43:08AM -0700, H.J. Lu wrote:
> run-conformtest.sh takes most of time in "make check".
> When I am working on unrelated changes, it is too long.
> conform/Makefile has
> 
> ifneq (yes,$(fast-check))
> ifeq (no,$(cross-compiling))
> tests: $(objpfx)run-conformtest.out
> endif
> endif
> 
> But fast-check isn't set anywhere.  Should we add
> --enable-fast-check to configure?

Not sure if it's worth it.  I use make -k fast-check=yes xcheck
most of the time...

	Marek