make signgam a weak alias for an internal symbol

otherwise, the standard C lgamma function will clobber a symbol in the
namespace reserved for the application.

diff --git a/src/math/signgam.c b/src/math/signgam.c
index 12cc32d..b39ceb0 100644 (file)
--- a/src/math/signgam.c
+++ b/src/math/signgam.c
@@ -1,2 +1,5 @@
-#include <math.h>
-int signgam = 0;
+#include "libm.h"
+
+int __signgam = 0;
+
+weak_alias(__signgam, signgam);