Use lrint() from math library if available

Moves -lm from being hardcoded in Makefile.am to being added via
AC_SEARCH_LIBS in configure.ac setting it in $(MATH_LIBS)

Using lrint() [returns long int] instead of rint() [returns double]
clears a bunch of gcc warnings of the form:
"cast from function call of type ‘double’ to non-matching type ‘short int’"

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/Graphics.c b/Graphics.c
index b3ec1bc..43c48b9 100644
--- a/Graphics.c
+++ b/Graphics.c
@@ -30,6 +30,10 @@ from The Open Group.
  * Author:  Davor Matic, MIT X Consortium
  */
 
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
 #include <X11/IntrinsicP.h>
 #include <X11/StringDefs.h>
 #include <X11/Xfuncs.h>
@@ -46,7 +50,11 @@ from The Open Group.
 #define min(x, y)                     (((int)(x) < (int)(y)) ? (x) : (y))
 #define max(x, y)                     (((int)(x) > (int)(y)) ? (x) : (y))
 #ifndef rint
-#define rint(x)                       floor(x + 0.5)
+# if HAVE_LRINT
+#  define rint(x)                     lrint(x)
+# else
+#  define rint(x)                     floor(x + 0.5)
+# endif
 #endif
 
 /*****************************************************************************\