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If Cabal doesn't see the .ly file then it won't try to run happy, and
thus won't fail if happy isn't installed.

This is a hack, but it means we get libHSrts*.a etc rather than just
libHSrts.a.

The previous hack to include Parser.hs in source distros broke the possibility
of doing a "make dist" in a fresh tree, i.e. one which has just been checked
out and configured, but *not* built. Of course you will need Happy for such a
source distro later, but at least the freedom to do this is important.

The ultimate goal should be that something like "make dist" will work in a
freshly checked out tree, with no prerequisite steps (this is very common in
most projects). We should move towards that goal, not away from it...


MERGE TO STABLE

Ian Lynagh <igloo@earth.li>**20070916005328] {

Paths like c:/foo/bar get misinterpreted by rsync (really SSH?), as it
thinks we want /foo/bar on the machine c.

We don't have the _darcs directories, so they won't work.

After
    make binary-dist stage=2
you can run make in bindisttest/ to test it

We now have various flags that need to be passed to gcc, but only if
the local gcc version supports them.  So instead of wiring this
knowledge into ghc when it is built, we now put these "extra gcc
flags" into a text file in $libdir, extra-gcc-flags, which is created
by configure.  It is also created by the configure script of a binary
distribution, so a binary dist is independent of the gcc version used
to build it.

Hopefully I got the binary-dist stuff right, but binary dists aren't
currently working so we'll need to come back and check this.

It was done in a bit of the Makefile that was if'ed out for Windows.

gmp is now in a top-level directory and we only have the tarball in the
darcs repo. It gets untarred if it is needed.

Bindists should now work again, when doing "make install" at least.
"make in-place" is probably still broken.

Key changes:
* Always build as if BIN_DIST is 1. BIN_DIST is thus removed.
* Libraries are configured with prefix set to $$topdir rather than $(prefix)