X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ftanhf.m4;h=9dcc49575c0f2622898d330429505b05e64767fd;hb=1276a2c5f24c0c932426aca9c899fa524d2443f2;hp=2608f97ee7f1ec0d106cd21710474e34716ae2ac;hpb=21492d6c3ca00ff0827528640804732f2ed66470;p=gnulib.git

diff --git a/m4/tanhf.m4 b/m4/tanhf.m4
index 2608f97ee..9dcc49575 100644
--- a/m4/tanhf.m4
+++ b/m4/tanhf.m4
@@ -1,5 +1,5 @@
-# tanhf.m4 serial 1
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# tanhf.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_TANHF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_TANH])
 
+  dnl Persuade glibc <math.h> to declare tanhf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether tanhf() exists. Assume that tanhf(), if it exists, is
   dnl defined in the same library as tanh().
   save_LIBS="$LIBS"