X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ftanhf.m4;h=2e49e1c0f96d98a43746787f625be1e93de5b73d;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=f5336e5e0b879c57e16577570e7ef2352a0ab4b5;hpb=1602f0afed21be664fcf5c42d59db07cc22c56d6;p=gnulib.git

diff --git a/m4/tanhf.m4 b/m4/tanhf.m4
index f5336e5e0..2e49e1c0f 100644
--- a/m4/tanhf.m4
+++ b/m4/tanhf.m4
@@ -1,5 +1,5 @@
-# tanhf.m4 serial 1
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# tanhf.m4 serial 2
+dnl Copyright (C) 2011-2013 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"