From 107b1f6fc600d496e7858d2a360db999b8e0f0f8 Mon Sep 17 00:00:00 2001
From: kenner <kenner@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 20 Jan 1997 02:19:04 +0000
Subject: [PATCH] (set_float_handler): Set up signal catcher on first call in
 case a front end has disabled it.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@13534 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/toplev.c | 41 ++++++++++++++++++++++++-----------------
 1 file changed, 24 insertions(+), 17 deletions(-)

diff --git a/gcc/toplev.c b/gcc/toplev.c
index 34e695de5c9..1828ecb3ad1 100644
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -1870,9 +1870,27 @@ floor_log2_wide (x)
   return log;
 }
 
+static int float_handler_set;
 int float_handled;
 jmp_buf float_handler;
 
+/* Signals actually come here.  */
+
+static void
+float_signal (signo)
+     /* If this is missing, some compilers complain.  */
+     int signo;
+{
+  if (float_handled == 0)
+    abort ();
+#if defined (USG) || defined (hpux)
+  signal (SIGFPE, float_signal);  /* re-enable the signal catcher */
+#endif
+  float_handled = 0;
+  signal (SIGFPE, float_signal);
+  longjmp (float_handler, 1);
+}
+
 /* Specify where to longjmp to when a floating arithmetic error happens.
    If HANDLER is 0, it means don't handle the errors any more.  */
 
@@ -1883,6 +1901,12 @@ set_float_handler (handler)
   float_handled = (handler != 0);
   if (handler)
     bcopy ((char *) handler, (char *) float_handler, sizeof (float_handler));
+
+  if (float_handled && ! float_handler_set)
+    {
+      signal (SIGFPE, float_signal);
+      float_handler_set = 1;
+    }
 }
 
 /* Specify, in HANDLER, where to longjmp to when a floating arithmetic
@@ -1917,23 +1941,6 @@ pop_float_handler (handled, handler)
     bcopy ((char *) handler, (char *) float_handler, sizeof (float_handler));
 }
 
-/* Signals actually come here.  */
-
-static void
-float_signal (signo)
-     /* If this is missing, some compilers complain.  */
-     int signo;
-{
-  if (float_handled == 0)
-    abort ();
-#if defined (USG) || defined (hpux)
-  signal (SIGFPE, float_signal);  /* re-enable the signal catcher */
-#endif
-  float_handled = 0;
-  signal (SIGFPE, float_signal);
-  longjmp (float_handler, 1);
-}
-
 /* Handler for SIGPIPE.  */
 
 static void
-- 
2.11.0