X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fcold%2Fslam.lisp;h=02d91ad88f04af17a7fee0133129c0c9d534dd47;hb=47c73b316a434da5bab4e39b746bbe9a0f17aa8c;hp=92534c64ca576f6e55849c91c12fb687d3db524c;hpb=2db3b6b4cb740d5b6512459c223859f747807b09;p=sbcl.git

diff --git a/src/cold/slam.lisp b/src/cold/slam.lisp
index 92534c6..02d91ad 100644
--- a/src/cold/slam.lisp
+++ b/src/cold/slam.lisp
@@ -29,16 +29,25 @@
        ;; recompile unnecessarily than sometimes bogusly to assume
        ;; up-to-date-ness.)
        (> (file-write-date output)
-	  (file-write-date input))))
+          (file-write-date input))))
+
+;;; One possible use-case for slam.sh is to generate a trace-file for
+;;; a file that is suddenly of interest, but was not of interest
+;;; before.  In order for this to work, we need to reload the stems
+;;; and flags from build-order.lisp-expr, the user needs to have added
+;;; :trace-file as a flag.
+(setf *stems-and-flags* (read-from-file "build-order.lisp-expr"))
 
 (do-stems-and-flags (stem flags)
   (unless (position :not-target flags)
-    (let ((srcname (concatenate 'string stem ".lisp"))
-	  (objname (concatenate 'string
-				*target-obj-prefix*
-				stem
-				*target-obj-suffix*)))
-      (unless (output-up-to-date-wrt-input-p objname srcname)
-	(target-compile-stem stem
-			     :assem-p (find :assem flags)
-			     :ignore-failure-p (find :ignore-failure-p flags))))))
+    (let ((srcname (stem-source-path stem))
+          (objname (stem-object-path stem flags :target-compile)))
+      (unless (and (output-up-to-date-wrt-input-p objname srcname)
+                   ;; Back to our "new-trace-file" case, also build if
+                   ;; a trace file is desired but is out-of-date.
+                   (or (not (position :trace-file flags))
+                       (output-up-to-date-wrt-input-p
+                        (concatenate 'string (stem-remap-target stem)
+                                     ".trace")
+                        srcname)))
+        (target-compile-stem stem flags)))))