[project @ 2002-11-13 12:21:08 by simonmar]
Add support for gcc-style "make bootstrap" which will build the stage
1, 2 and 3 compilers in the same build tree.
The idea is to simplify building a stage 2 or 3 compiler (now you only
need one build tree), and also speed up the build: there's no need to
compile the libraries more than once, because the stage 1 libraries
are used for stages 2 & 3.
In ghc/compiler, the objects and .hi files are now placed in
subdirectories: ghc/compiler/stage1 has the stage1 objects,
ghc/compiler/stage2 has the stage2 objects, etc.
The story from the top-level (fptools) is this:
make all works as before (i.e. builds ghc (stage 1),
libraries, etc.)
make stage2 builds the stage 2 compiler
make stage3 builds the stage 3 compiler
make bootstrap does 'make all' followed by 'make stage2'
make bootstrap3 does 'make all' followed by 'make stage2; make stage3'
In ghc/compiler, the story is now:
make all works as before (i.e. builds stage 1 only)
make boot generate build dirs and dependencies for stage 1
make boot stage=N generate build dirs and dependencies for stage N
make stageN
make stage=N builds stage N compiler. Run it in-place using
./stageN/ghc-inplace.
I haven't decided what to do about 'make install' yet, and this still
needs documenting in the Building Guide. Also, you still get the same
$(GhcHcOpts) for each stage.