0.8.16.17

[sbcl.git] / src / cold / ansify.lisp

diff --git a/src/cold/ansify.lisp b/src/cold/ansify.lisp
index 693c632..25b957c 100644 (file)
--- a/src/cold/ansify.lisp
+++ b/src/cold/ansify.lisp
@@ -1,4 +1,4 @@
-;;;; patches to hide some implementation idiosyncrasies in our
+;;;; patches to work around implementation idiosyncrasies in our
 ;;;; cross-compilation host
 
 ;;;; This software is part of the SBCL system. See the README file for
@@ -12,35 +12,31 @@
 \f
 ;;;; CLISP issues
 
+;;; as explained on #lisp ca. October 2003:
+;;;   <Krystof> chandler: nope, I'm blaming another clisp bug
+;;;   <Krystof> [8]> least-positive-short-float
+;;;   <Krystof> 2.93874s-39
+;;;   <Krystof> [9]> (coerce * 'single-float)
+;;;   <Krystof> 0.0
+;;;   <chandler> aah
+;;;   <mwh> "oops"
+;;;   <Krystof> yep
+;;;   <mwh> tried that on clisp from fink:
+;;;   <mwh> [1]> least-positive-short-float
+;;;   <mwh> 2.93874s-39
+;;;   <mwh> [2]> (coerce * 'single-float)
+;;;   <mwh> *** - floating point underflow
+;;;   <Krystof> yeah
+;;;   <mwh> shall i not try to build sbcl with that?
+;;;   <Krystof> if you turn off underflow traps, then you get 0.0
+;;;   <mwh> well, that makes sense, i guess
+;;;   <Krystof> #+clisp
+;;;   <Krystof> (ext:without-package-lock ("SYSTEM")
+;;;   <Krystof>   (setf system::*inhibit-floating-point-underflow* t))
+;;;   <Krystof> (in src/cold/ansify.lisp)
 #+clisp
-(locally
-
-  (in-package "COMMON-LISP")
-
-  ;; no longer needed in CLISP 1999-01-08, hurrah!
-  #|
-  ;; ANSI specifies that package LISP defines the type BOOLEAN, and the CMU CL
-  ;; compiler uses it a lot. This should be trivial to patch in CLISP, except
-  ;; that CLISP defines FFI:BOOLEAN, which conflicts. Gads.. Here we try to fix
-  ;; it with some package hacking. (Please do not take this as an example of
-  ;; good package hacking, I just messed with it until it seemed to work well
-  ;; enough to bootstrap CMU CL, because I'm highly unmotivated to make elegant
-  ;; fixes for nonstandard behavior. -- WHN)
-  (shadow 'ffi:boolean "FFI")
-  (deftype cl::boolean () '(member t nil))
-  (export 'boolean "LISP")
-  |#
-
-  ;; apparently fixed sometime in 2001, hurray!
-  #| (error "can't use CLISP -- no MAKE-LOAD-FORM") |#
-
-  ;; CLISP is still unsupported as a cross-compilation host because of
-  ;; these known problems:
-  (flet ((clisp-ouch (s) (error "can't bootstrap with CLISP: ~A" s)))
-    ;; These problems don't seem deep, and could probably be worked
-    ;; around.
-    #+nil (clisp-ouch "no (DOCUMENTATION X) when X is a PACKAGE")
-    #+nil (clisp-ouch "no (FUNCTION (SETF SYMBOL-FUNCTION))")))
+(ext:without-package-lock ("SYSTEM")
+  (setf system::*inhibit-floating-point-underflow* t))
 \f
 ;;;; CMU CL issues
 
@@ -72,14 +68,35 @@
   (warn "CMU CL has a broken implementation of READ-SEQUENCE.")
   (pushnew :no-ansi-read-sequence *features*))
 
+;;; This is apparently quite old, according to 
+;;; <http://tunes.org/~nef/logs/lisp/03.10.22>:
+;;;   <dan`b> (error "CMUCL on Alpha can't read floats in the format \"1.0l0\".
+;;;   <dan`b> the warning relates to a random vinary produced from cvs of
+;;;           around feb 2000, the corresponding sources to which I never found
+;;; (But it seems harmless to leave it here forever just in case.)
 #+(and cmu alpha)
 (unless (ignore-errors (read-from-string "1.0l0"))
   (error "CMUCL on Alpha can't read floats in the format \"1.0l0\".  Patch your core file~%~%"))
+
+#+(and cmu sparc)
+(ext:set-floating-point-modes :traps '(:overflow :invalid :divide-by-zero))
+\f
+;;;; OpenMCL issues
+
+;;; This issue in OpenMCL led to some SBCL bug reports ca. late 2003.
+#+openmcl 
+(unless (ignore-errors (funcall (constantly t) 1 2 3)) 
+  (error "please find a binary that understands CONSTANTLY to build from"))
 \f
 ;;;; general non-ANSI-ness
 
 (in-package :sb-cold)
 
+(defmacro munging-cl-package (&body body)
+  #-clisp `(progn ,@body)
+  #+clisp `(ext:without-package-lock ("CL")
+            ,@body))
+
 ;;; Do the exports of COMMON-LISP conform to the standard? If not, try
 ;;; to make them conform. (Of course, ANSI says that bashing symbols
 ;;; in the COMMON-LISP package like this is undefined, but then if the
@@ -96,13 +113,16 @@
             (declare (ignore value))
             (unless (gethash key standard-ht)
               (warn "removing non-ANSI export from package CL: ~S" key)
-              (unexport (intern key cl) cl)))
+              (munging-cl-package
+               (unexport (intern key cl) cl))))
           host-ht)
   (maphash (lambda (key value)
             (declare (ignore value))
             (unless (gethash key host-ht)
               (warn "adding required-by-ANSI export to package CL: ~S" key)
-              (export (intern key cl) cl))
+              (munging-cl-package 
+               (export (intern key cl) cl)))
+            
             ;; FIXME: My righteous indignation below was misplaced. ANSI sez
             ;; (in 11.1.2.1, "The COMMON-LISP Package") that it's OK for
             ;; COMMON-LISP things to have their home packages elsewhere.