# This is a script to be run as part of make.sh. The only time you'd
# want to run it by itself is if you're trying to cross-compile the
# system or if you're doing some kind of troubleshooting.
# This software is part of the SBCL system. See the README file for
# more information.
# This software is derived from the CMU CL system, which was
# written at Carnegie Mellon University and released into the
# public domain. The software is in the public domain and is
# provided with absolutely no warranty. See the COPYING and CREDITS
# files for more information.
echo //entering make-host-2.sh
# In some cases, a debugging build of the system will creates a core
# file output/after-xc.core in the next step. In cases where it
# doesn't, it's confusing and basically useless to have any old copies
# lying around, so delete:
rm -f output/after-xc.core
# In a fresh host Lisp invocation, load and run the cross-compiler to
# create the target object files describing the target SBCL.
# (There are at least three advantages to running the cross-compiler in a
# fresh host Lisp invocation instead of just using the same Lisp invocation
# that we used to compile it:
# (1) It reduces the chance that the cross-compilation process
# inadvertently comes to depend on some weird compile-time
# side effect.
# (2) It reduces peak memory demand (because definitions wrapped in
# (EVAL-WHEN (:COMPILE-TOPLEVEL :EXECUTE) ..) aren't defined
# in the fresh image).
# (3) It makes it easier to jump in and retry a step when tweaking
# and experimenting with the bootstrap procedure.
# Admittedly, these don't seem to be enormously important advantages, but
# the only disadvantage seems to be the extra time required to reload
# the fasl files into the new host Lisp, and that doesn't seem to be
# an enormously important disadvantage, either.)
echo //running cross-compiler to create target object files
$SBCL_XC_HOST <<-'EOF' || exit 1
;;; Set up the cross-compiler.
(setf *print-level* 5 *print-length* 5)
(setf *host-obj-prefix* "obj/from-host/"
(defun proclaim-target-optimization ()
(let ((debug (if (position :sb-show *shebang-features*) 2 1)))
(sb-xc:proclaim `(optimize (compilation-speed 1)
;; SAFETY = SPEED (and < 3) should
;; reasonable safety, but might skip
;; some unreasonably expensive stuff
;; (e.g. %DETECT-STACK-EXHAUSTION
;; in sbcl-0.7.2).
(defun in-target-cross-compilation-mode (fn)
"Call FN with everything set up appropriately for cross-compiling
a target file."
(let (;; In order to increase microefficiency of the target Lisp,
;; enable old CMU CL defined-function-types-never-change
;; optimizations. (ANSI says users aren't supposed to
;; redefine our functions anyway; and developers can
;; fend for themselves.)
#!-sb-fluid (sb!ext:*derive-function-types* t)
;; FIXME: *TOPLEVEL-LAMBDA-MAX* should go away altogether.
;; Let the target know that we're the cross-compiler.
(*features* (cons :sb-xc *features*))
;; We need to tweak the readtable..
;; ..in order to make backquotes expand into target code
;; instead of host code.
;; FIXME: Isn't this now taken care of automatically by
;; toplevel forms in the xcompiler backq.lisp file?
(set-macro-character #\` #'sb!impl::backquote-macro)
(set-macro-character #\, #'sb!impl::comma-macro)
;; Control optimization policy.
;; Specify where target machinery lives.
(with-additional-nickname ("SB-XC" "SB!XC")
(setf *target-compile-file* 'sb-xc:compile-file)
(setf *target-assemble-file* 'sb!c:assemble-file)
;;; Run the cross-compiler to produce cold fasl files.
;;; miscellaneous tidying up and saving results
(let ((filename "output/object-filenames-for-genesis.lisp-expr"))
(ensure-directories-exist filename :verbose t)
(with-open-file (s filename :direction :output)
(write *target-object-file-names* :stream s :readably t)))
;; Let's check that the type system was reasonably sane. (It's
;; easy to spend a long time wandering around confused trying
;; to debug cold init if it wasn't.)
(when (position :sb-test *shebang-features*)
;; If you're experimenting with the system under a
;; cross-compilation host which supports CMU-CL-style SAVE-LISP,
;; this can be a good time to run it. The resulting core isn't
;; used in the normal build, but can be handy for experimenting
;; with the system. (See slam.sh for an example.)
(when (position :sb-after-xc-core *shebang-features*)
#+cmu (ext:save-lisp "output/after-xc.core" :load-init-file nil)
#+sbcl (sb-ext:save-lisp-and-die "output/after-xc.core")
# Run GENESIS (again) in order to create cold-sbcl.core. (The first
# time was before we ran the cross-compiler, in order to create the
# header file which was needed in order to run gcc on the runtime