Add last-ditch defense against attempts to compile datetime code with

-ffast-math.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index bfdb7d06efc..2c8f882e384 100644
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -1,14 +1,14 @@
 /*-------------------------------------------------------------------------
  *
  * timestamp.c
- *	  Functions for the built-in SQL92 type "timestamp" and "interval".
+ *	  Functions for the built-in SQL92 types "timestamp" and "interval".
  *
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.73 2002/09/04 20:31:29 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.74 2002/09/21 19:52:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -28,6 +28,14 @@
 #include "utils/array.h"
 #include "utils/builtins.h"
 
+/*
+ * gcc's -ffast-math switch breaks routines that expect exact results from
+ * expressions like timeval / 3600, where timeval is double.
+ */
+#ifdef __FAST_MATH__
+#error -ffast-math is known to break this code
+#endif
+
 
 #ifdef HAVE_INT64_TIMESTAMP
 static int64 time2t(const int hour, const int min, const int sec, const fsec_t fsec);