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-rw-r--r--lib/isnanl-nolibm.h9
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/isnanl-nolibm.h b/lib/isnanl-nolibm.h
index 3ea82f7d..f0219dea 100644
--- a/lib/isnanl-nolibm.h
+++ b/lib/isnanl-nolibm.h
@@ -35,5 +35,12 @@
/* Test whether X is a NaN. */
# undef isnanl
# define isnanl rpl_isnanl
-extern int isnanl (long double x);
+extern
+# ifdef __cplusplus
+"C"
+# endif
+int isnanl (long double x);
#endif
+
+/* Tell <math.h> that our isnanl does not need libm. */
+#define HAVE_ISNANL_NOLIBM 1