X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fsinhf.m4;h=9a7cbb6d5e5376f4ef0662c80b7781eedbbd6f01;hb=cd56634;hp=99d43b9752fac1a3c5281a141871c6df2c5b16a5;hpb=2408f02086a20c0a02241cd4a1cf11f126a95fe3;p=gnulib.git

diff --git a/m4/sinhf.m4 b/m4/sinhf.m4
index 99d43b975..9a7cbb6d5 100644
--- a/m4/sinhf.m4
+++ b/m4/sinhf.m4
@@ -1,5 +1,5 @@
-# sinhf.m4 serial 1
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# sinhf.m4 serial 2
+dnl Copyright (C) 2011-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,6 +9,9 @@ AC_DEFUN([gl_FUNC_SINHF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_SINH])
 
+  dnl Persuade glibc <math.h> to declare sinhf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether sinhf() exists. Assume that sinhf(), if it exists, is
   dnl defined in the same library as sinh().
   save_LIBS="$LIBS"