Fall back to sin() and cos() calls on systems without sincos()

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

2 files changed, 11 insertions, 2 deletions

diff --git a/Clock.c b/Clock.c
index 692dd5b..1a6f685 100644
--- a/Clock.c
+++ b/Clock.c
@@ -1734,7 +1734,14 @@ erase_hands(ClockWidget w, struct tm *tm)
 static void
 ClockAngle(double tick_units, double *sinp, double *cosp)
 {
-    sincos(tick_units * (M_PI / 180 / 10.0), sinp, cosp);
+    double angle = tick_units * (M_PI / 180 / 10.0);
+
+#ifdef HAVE_SINCOS
+    sincos(angle, sinp, cosp);
+#else
+    *sinp = sin(angle);
+    *cosp = cos(angle);
+#endif
 }
 
 /*
diff --git a/configure.ac b/configure.ac
index eb79e69..a310d50 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,7 +53,9 @@ if test x$use_xft != xno ; then
 	PKG_CHECK_MODULES(XFT, [xrender xft])
 	# Solaris 11 has sqrt in libc but needs libm for sincos
 	AC_SEARCH_LIBS(sqrt, [m])
-	AC_SEARCH_LIBS(sincos, [m])
+	AC_SEARCH_LIBS(sincos, [m],
+            AC_DEFINE([HAVE_SINCOS], [1],
+                      [Define to 1 if you have the `sincos' function.]))
 	XCLOCK_CFLAGS="$XCLOCK_CFLAGS $XFT_CFLAGS"
 	XCLOCK_LIBS="$XCLOCK_LIBS $XFT_LIBS"
 	AC_DEFINE([XRENDER],1,[Define to use X Render Extension])