Enable conservative stack scanning for all architectures.

Suggested by Stefan Monnier in
<http://lists.gnu.org/archive/html/emacs-devel/2013-01/msg00183.html>.
* configure.ac (GC_MARK_STACK): Remove.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/lisp.h b/src/lisp.h
index 22e0a188e4b..3b7af46fdde 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -2217,8 +2217,12 @@ struct gcpro
    2    Mark the stack, and check that everything GCPRO'd is
         marked.
    3    Mark using GCPRO's, mark stack last, and count how many
-        dead objects are kept alive.  */
+        dead objects are kept alive.
 
+   Formerly, method 0 was used.  Currently, method 1 is used unless
+   otherwise specified by hand when building, e.g.,
+   "make CPPFLAGS='-DGC_MARK_STACK=GC_USE_GCPROS_AS_BEFORE'".
+   Methods 2 and 3 are present mainly to debug the transition from 0 to 1.  */
 
 #define GC_USE_GCPROS_AS_BEFORE         0
 #define GC_MAKE_GCPROS_NOOPS            1