Add a crossbuild test config for #-sb-unicode

which happens to be #+win32 and exposed a bug that a no-longer-needed allowance
for warnings caused it to exit with success despite a missing BASE-CHAR-P, and
also that there was also a pre-existing warning in stream.lisp if #-sb-unicode.

build-all-cores.sh

@@ -42,6 +42,7 @@
     ("sparc"  ("sparc-sunos" :big-endian :unix :sunos :elf)
               ("sparc-linux" :big-endian :unix :linux :elf))
     ("x86"    ("x86" :little-endian :largefile)
+              ("x86-ascii" :little-endian :largefile (not :sb-unicode))
               ("x86-thread" :little-endian :largefile :sb-thread)
               ("x86-linux" :little-endian :largefile :sb-thread :linux :unix :elf :sb-thread))
     ("x86-64" ("x86-64" :little-endian :avx2 :gencgc :sb-simd-pack :sb-simd-pack-256)

crossbuild-runner/Makefile

@@ -59,6 +59,11 @@ obj/xbuild/x86/xc.core: $(DEPS1)
 obj/xbuild/x86.core: obj/xbuild/x86/xc.core
 	$(SBCL) $(ARGS) x86 < $(SCRIPT2)
 
+obj/xbuild/x86-ascii/xc.core: $(DEPS1)
+	$(SBCL) $(ARGS) x86-ascii x86 "(:WIN32 :SB-THREAD :SB-SAFEPOINT :LITTLE-ENDIAN :LARGEFILE (NOT :SB-UNICODE))" < $(SCRIPT1)
+obj/xbuild/x86-ascii.core: obj/xbuild/x86-ascii/xc.core
+	$(SBCL) $(ARGS) x86-ascii < $(SCRIPT2)
+
 obj/xbuild/x86-thread/xc.core: $(DEPS1)
 	$(SBCL) $(ARGS) x86-thread x86 "(:WIN32 :SB-THREAD :SB-SAFEPOINT :LITTLE-ENDIAN :LARGEFILE :SB-THREAD)" < $(SCRIPT1)
 obj/xbuild/x86-thread.core: obj/xbuild/x86-thread/xc.core

crossbuild-runner/pass-1.lisp

@@ -4,12 +4,14 @@
         (destructuring-bind (first second third) (cdr *posix-argv*)
           (values first second third)))
        (arch-symbol (intern (string-upcase target-name) "KEYWORD"))
-       ;; TODO: allow subtractive features too
-       (add-features (read-from-string features))
+       (features (read-from-string features))
+       (subtract-features
+        (mapcan (lambda (x) (if (typep x '(cons (eql not))) (list (cadr x))))
+                features))
+       (add-features (remove-if-not #'symbolp features))
        (build-dir (format nil "obj/xbuild/~A/" configuration-name))
        (ltf (format nil "~A/local-target-features" build-dir))
        (objroot (format nil "~A/from-host/" build-dir)))
-  ;; (format t "~&added features: ~S~%" add-features)
   (ensure-directories-exist objroot)
   (defvar *sbcl-host-obj-prefix* objroot)
   (let ((makeflags (sb-ext:posix-getenv "MAKEFLAGS")))
@@ -23,7 +25,7 @@
                                      :if-does-not-exist :create
                                      :if-exists :supersede)
     (format t "(lambda (features)
-(union features (list :crossbuild-test :os-provides-dlopen ~s~{ ~s~}~%"
+(set-difference (union features (list :crossbuild-test :os-provides-dlopen ~s~{ ~s~}~%"
             arch-symbol add-features)
     ;; "features" contains the mandatory set of symbols for any build of that target.
     (let ((features-filename "features"))
@@ -32,7 +34,7 @@
         (let ((string (make-string (file-length f))))
           (read-sequence string f)
           (write-string string))))
-    (format t ")))~%"))
+    (format t ")) '~S))~%" subtract-features))
   (load "make-host-1.lisp")
   (finish-output sb-sys:*stdout*)
   (finish-output sb-sys:*stderr*)

crossbuild-runner/pass-2.lisp

@@ -45,7 +45,7 @@
                   sb-c::*undefined-warnings*)))
   (finish-output host-sb-sys:*stdout*)
   (finish-output host-sb-sys:*stderr*)
-  (when (and warnings (not (target-featurep :win32)))
+  (when warnings
     (error "Fail")))
 
 (load "tools-for-build/corefile.lisp" :verbose nil)

src/code/stream.lisp

@@ -2675,7 +2675,7 @@ benefit of the function GET-OUTPUT-STREAM-STRING."
         (setf (ansi-stream-misc stream) misc)))
 
 (defun stdstream-external-format (fd)
-  #-win32 (declare (ignore fd))
+  (declare (ignorable fd))
   (let* ((keyword (cond #+(and win32 sb-unicode)
                         ((sb-win32::console-handle-p fd)
                          :ucs-2)