Don't use USE_STACK_LISP_OBJECTS on Windows with GCC older than 4.2.

 src/lisp.h (USE_STACK_LISP_OBJECTS): Default to false for 32-bit
 MinGW builds that use GCC before 4.2.

Fixes: debbugs:18559

2 files changed, 10 insertions, 1 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 9c360e64de0..87d33121495 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,8 @@
 2014-09-25  Eli Zaretskii  <eliz@gnu.org>
 
+        * lisp.h (USE_STACK_LISP_OBJECTS): Default to false for 32-bit
+        MinGW builds that use GCC before 4.2.
+
         Default to stack objects on DOS_NT platforms as well.
         * w32term.h (ALIGN_STACK) [__GNUC__]: Define to
         __attribute__((force_align_arg_pointer)) for GCC 4.2 and later.
diff --git a/src/lisp.h b/src/lisp.h
index 82a99fcca34..b1f793c7282 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -286,7 +286,13 @@ error !;
    http://lists.gnu.org/archive/html/emacs-devel/2014-09/msg00506.html.  */
 #ifndef USE_STACK_LISP_OBJECTS
 # if defined __GNUC__ && !defined __clang__
-#  define USE_STACK_LISP_OBJECTS true
+   /* 32-bit MinGW builds need at least GCC 4.2 to support this.  */
+#  if defined __MINGW32__ && !defined _W64      \
+      && __GNUC__ + (__GNUC_MINOR__ > 1) < 5
+#   define USE_STACK_LISP_OBJECTS false
+#  else  /* !(__MINGW32__ && __GNUC__ < 4.2) */
+#   define USE_STACK_LISP_OBJECTS true
+#  endif
 # else
 #  define USE_STACK_LISP_OBJECTS false
 # endif