Distribute prebuilt bootstraps for common hosts

* am/bootstrap.am: New file, factored out of bootstrap/Makefile.am.
* bootstrap/Makefile.am: Use bootstrap.am.

* prebuilt/Makefile.am:
* prebuilt/i686-pc-linux-gnu/Makefile.am:
* prebuilt/mips-unknown-linux-gnu/Makefile.am:
* prebuilt/x86_64-unknown-linux-gnu/Makefile.am: New files.

* configure.ac: Output the prebuilt/ makefiles.
* Makefile.am: Descend into prebuilt/ when making dist.

* meta/uninstalled-env.in: Arrange to put prebuilt/ in the beginning of
  the GUILE_LOAD_COMPILED_PATH.  Also fix a case where bootstrap/ wasn't
  being correctly added to the load path.

bootstrap/Makefile.am

@@ -21,138 +21,11 @@
 ##   Fifth Floor, Boston, MA 02110-1301 USA
 
 
-GOBJECTS = $(SOURCES:%.scm=%.go)
-# No warnings for the bootstrap build.  Run
-#   make GUILE_WARNINGS="-Wunbound-variable -Warity-mismatch -Wformat"
-# to get the normal set of warnings.
 GUILE_WARNINGS =
 GUILE_OPTIMIZATIONS = -O1
-nobase_noinst_DATA = $(GOBJECTS) ice-9/eval.go
-CLEANFILES = $(GOBJECTS) ice-9/eval.go
+
+include $(top_srcdir)/am/bootstrap.am
 
 # We must build the evaluator first, so that we can be sure to control
 # the stack.
-$(GOBJECTS): ice-9/eval.go
-
-VM_TARGETS := system/vm/assembler.go system/vm/disassembler.go
-$(VM_TARGETS): $(top_builddir)/libguile/vm-operations.h
-
-AM_V_GUILEC = $(AM_V_GUILEC_$(V))
-AM_V_GUILEC_ = $(AM_V_GUILEC_$(AM_DEFAULT_VERBOSITY))
-AM_V_GUILEC_0 = @echo "  BOOTSTRAP GUILEC" $@;
-
-vpath %.scm @srcdir@/../module
-
-SUFFIXES = .scm .go
-
-.scm.go:
-	$(AM_V_GUILEC)GUILE_AUTO_COMPILE=0			\
-	$(top_builddir)/meta/uninstalled-env			\
-	guild compile --target="$(host)"                        \
-          $(GUILE_WARNINGS) $(GUILE_OPTIMIZATIONS)              \
-	  -L "$(abs_top_srcdir)/module"                         \
-	  -L "$(abs_top_srcdir)/guile-readline"			\
-	  -o "$@" "$<"
-
-# A subset of sources that are used by the compiler.  We can compile
-# these in any order; the order below is designed to hopefully result in
-# the lowest total compile time.
-SOURCES =					\
-  ice-9/psyntax-pp.scm				\
-  language/cps/intmap.scm			\
-  language/cps/intset.scm			\
-  language/cps/utils.scm			\
-  ice-9/vlist.scm				\
-  srfi/srfi-1.scm				\
-						\
-  language/tree-il.scm				\
-  language/tree-il/analyze.scm			\
-  language/tree-il/canonicalize.scm		\
-  language/tree-il/compile-cps.scm		\
-  language/tree-il/debug.scm			\
-  language/tree-il/effects.scm			\
-  language/tree-il/fix-letrec.scm		\
-  language/tree-il/optimize.scm			\
-  language/tree-il/peval.scm			\
-  language/tree-il/primitives.scm		\
-  language/tree-il/spec.scm			\
-						\
-  language/cps.scm				\
-  language/cps/closure-conversion.scm		\
-  language/cps/compile-bytecode.scm		\
-  language/cps/constructors.scm			\
-  language/cps/contification.scm		\
-  language/cps/cse.scm				\
-  language/cps/dce.scm				\
-  language/cps/effects-analysis.scm		\
-  language/cps/elide-values.scm			\
-  language/cps/licm.scm				\
-  language/cps/peel-loops.scm			\
-  language/cps/primitives.scm			\
-  language/cps/prune-bailouts.scm		\
-  language/cps/prune-top-level-scopes.scm	\
-  language/cps/reify-primitives.scm		\
-  language/cps/renumber.scm			\
-  language/cps/rotate-loops.scm			\
-  language/cps/optimize.scm			\
-  language/cps/simplify.scm			\
-  language/cps/self-references.scm		\
-  language/cps/slot-allocation.scm		\
-  language/cps/spec.scm				\
-  language/cps/specialize-primcalls.scm		\
-  language/cps/specialize-numbers.scm		\
-  language/cps/split-rec.scm			\
-  language/cps/type-checks.scm			\
-  language/cps/type-fold.scm			\
-  language/cps/types.scm			\
-  language/cps/verify.scm			\
-  language/cps/with-cps.scm			\
-						\
-  language/scheme/spec.scm			\
-  language/scheme/compile-tree-il.scm		\
-  language/scheme/decompile-tree-il.scm		\
-						\
-  language/bytecode.scm				\
-  language/bytecode/spec.scm			\
-						\
-  language/value/spec.scm			\
-						\
-  system/base/pmatch.scm			\
-  system/base/syntax.scm			\
-  system/base/compile.scm			\
-  system/base/language.scm			\
-  system/base/lalr.scm				\
-  system/base/message.scm			\
-  system/base/target.scm			\
-  system/base/types.scm				\
-  system/base/ck.scm				\
-						\
-  ice-9/boot-9.scm				\
-  ice-9/r5rs.scm				\
-  ice-9/deprecated.scm				\
-  ice-9/binary-ports.scm			\
-  ice-9/command-line.scm			\
-  ice-9/control.scm				\
-  ice-9/format.scm				\
-  ice-9/getopt-long.scm				\
-  ice-9/i18n.scm				\
-  ice-9/match.scm				\
-  ice-9/networking.scm				\
-  ice-9/posix.scm				\
-  ice-9/rdelim.scm				\
-  ice-9/receive.scm				\
-  ice-9/regex.scm				\
-  ice-9/session.scm				\
-  ice-9/pretty-print.scm			\
-						\
-  system/vm/assembler.scm			\
-  system/vm/debug.scm				\
-  system/vm/disassembler.scm			\
-  system/vm/dwarf.scm				\
-  system/vm/elf.scm				\
-  system/vm/frame.scm				\
-  system/vm/linker.scm				\
-  system/vm/loader.scm				\
-  system/vm/program.scm				\
-  system/vm/vm.scm				\
-  system/foreign.scm
+$(filter-out ice-9/eval.go, $(GOBJECTS)): ice-9/eval.go