X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=base-target-features.lisp-expr;h=33048650e1da5b8bede24108956b87460cbe1b7c;hb=b05ccdd91520249de6b465e226d3708089e541dc;hp=671f0fb911bd78d6c09e8fd01ec150171d9b04df;hpb=90ca09b75fbc3b63b2f7d09c67b04b866dd783f6;p=sbcl.git

diff --git a/base-target-features.lisp-expr b/base-target-features.lisp-expr
index 671f0fb..3304865 100644
--- a/base-target-features.lisp-expr
+++ b/base-target-features.lisp-expr
@@ -1,3 +1,5 @@
+;;;; -*- Lisp -*-
+
 ;;;; tags which are set during the build process and which end up in
 ;;;; CL:*FEATURES* in the target SBCL, plus some comments about other
 ;;;; CL:*FEATURES* tags which have special meaning to SBCL or which
@@ -40,13 +42,17 @@
  ;; our standard
  :ansi-cl :common-lisp
  ;; FIXME: Isn't there a :x3jsomething feature which we should set too?
+ ;; No. CLHS says ":x3j13 [...] A conforming implementation might or
+ ;; might not contain such a feature." -- CSR, 2002-02-21
 
  ;; our dialect
  :sbcl
 
  ;; Douglas Thomas Crosher's conservative generational GC (the only one
- ;; we currently support for X86)
- :gencgc
+ ;; we currently support for X86).
+ ;; :gencgc used to be here; CSR moved it into
+ ;; local-target-features.lisp-expr via make-config.sh, as alpha,
+ ;; sparc and ppc ports don't currently support it. -- CSR, 2002-02-21
 
  ;; We're running under a UNIX. This is sort of redundant, and it was also
  ;; sort of redundant under CMU CL, which we inherited it from: neither SBCL
@@ -242,6 +248,13 @@
  ;; documented in the CMU CL code that SBCL is derived from, and is
  ;; present but stale in SBCL as of 0.6.12.)
  ;;
+ ;; properties derived from the machine architecture
+ ;;   :stack-grows-downward, :stack-grows-downward
+ ;;     One of these two should be present in the features list of any
+ ;;     CPU supported as of sbcl-0.7.1.29. On the X86, the system stack
+ ;;     grows downward. On the other supported CPU architectures, the
+ ;;     system stack grows upward. 
+ ;;
  ;; operating system features:
  ;;   :linux   = We're intended to run under some version of Linux.
  ;;   :bsd     = We're intended to run under some version of BSD Unix. (This