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-rw-r--r--newlib/libc/include/math.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
index 1be7511dc..dbbae0048 100644
--- a/newlib/libc/include/math.h
+++ b/newlib/libc/include/math.h
@@ -81,6 +81,8 @@ typedef double double_t;
extern int __fpclassifyf (float x);
extern int __fpclassifyd (double x);
+extern int __signbitf (float x);
+extern int __signbitd (double x);
#define fpclassify(x) \
(__extension__ ({__typeof__(x) __x = (x); \