X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fcoshf.m4;h=33b3aa03a8ef6d389c4c498beec0be13912ad135;hb=c63a72ef0d158de1d98ca46e510adee2e4299e3b;hp=e9bf574f4e9305b00e828922658cc70daf2b506d;hpb=1602f0afed21be664fcf5c42d59db07cc22c56d6;p=gnulib.git

diff --git a/m4/coshf.m4 b/m4/coshf.m4
index e9bf574f4..33b3aa03a 100644
--- a/m4/coshf.m4
+++ b/m4/coshf.m4
@@ -1,4 +1,4 @@
-# coshf.m4 serial 1
+# coshf.m4 serial 2
 dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,6 +9,9 @@ AC_DEFUN([gl_FUNC_COSHF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_COSH])
 
+  dnl Persuade glibc <math.h> to declare coshf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether coshf() exists. Assume that coshf(), if it exists, is
   dnl defined in the same library as cosh().
   save_LIBS="$LIBS"