From 34d77bd3b9811752154a103430a83bd8bff954ad Mon Sep 17 00:00:00 2001
From: ckolivas <kernel@kolivas.org>
Date: Wed, 9 Jul 2014 11:55:12 +0300
Subject: [PATCH] Make significant floating point errors fatal to avoid subtle
 bugs being missed

---
 configure.ac | 2 +-
 src/ckpool.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 223fc2d1..1059c64d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,7 +32,7 @@ AC_FUNC_ALLOCA
 PKG_PROG_PKG_CONFIG()
 
 AC_CHECK_HEADERS(stdio.h stdlib.h fcntl.h sys/time.h unistd.h dirent.h)
-AC_CHECK_HEADERS(ctype.h errno.h byteswap.h string.h time.h)
+AC_CHECK_HEADERS(ctype.h errno.h byteswap.h string.h time.h fenv.h)
 AC_CHECK_HEADERS(endian.h sys/endian.h arpa/inet.h sys/poll.h syslog.h)
 AC_CHECK_HEADERS(alloca.h pthread.h stdio.h math.h signal.h sys/prctl.h)
 AC_CHECK_HEADERS(sys/types.h sys/socket.h sys/stat.h linux/un.h netdb.h)
diff --git a/src/ckpool.c b/src/ckpool.c
index fc3dd3a4..e08cbc2f 100644
--- a/src/ckpool.c
+++ b/src/ckpool.c
@@ -15,6 +15,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <fenv.h>
 #include <grp.h>
 #include <jansson.h>
 #include <signal.h>
@@ -877,6 +878,9 @@ int main(int argc, char **argv)
 	int c, ret, i;
 	ckpool_t ckp;
 
+	/* Make significant floating point errors fatal to avoid subtle bugs being missed */
+	feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW );
+
 	global_ckp = &ckp;
 	memset(&ckp, 0, sizeof(ckp));
 	ckp.loglevel = LOG_NOTICE;