lib/dload.c: fix compiler warnings generated by -Wfloat-equal

* introduces new macro in util.h (DOUBLE_EQ) for properly comparing
  floating point values

Signed-off-by: Dave Reisner <d@falconindy.com>
Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/libalpm/util.h b/lib/libalpm/util.h
index 9f0344fe..1816e360 100644
--- a/lib/libalpm/util.h
+++ b/lib/libalpm/util.h
@@ -36,6 +36,8 @@
 #include <time.h>
 #include <sys/stat.h> /* struct stat */
 #include <archive.h> /* struct archive */
+#include <math.h> /* fabs */
+#include <float.h> /* DBL_EPSILON */
 
 #ifdef ENABLE_NLS
 #include <libintl.h> /* here so it doesn't need to be included elsewhere */
@@ -61,6 +63,8 @@
 	_alpm_log(PM_LOG_DEBUG, "returning error %d from %s : %s\n", err, __func__, alpm_strerrorlast()); \
 	return (ret); } while(0)
 
+#define DOUBLE_EQ(x, y) (fabs((x) - (y)) < DBL_EPSILON)
+
 /**
  * Used as a buffer/state holder for _alpm_archive_fgets().
  */