X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fexpf.m4;h=672164555e7afd4927b82ccafe8aacb3f07fc34a;hb=da8054d48dc22e1c051db54049e005d51a006e69;hp=d6370bf9aa27730329aeea44ca79e827b9e64dac;hpb=1602f0afed21be664fcf5c42d59db07cc22c56d6;p=gnulib.git

diff --git a/m4/expf.m4 b/m4/expf.m4
index d6370bf9a..672164555 100644
--- a/m4/expf.m4
+++ b/m4/expf.m4
@@ -1,5 +1,5 @@
-# expf.m4 serial 1
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# expf.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_EXPF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_EXP])
 
+  dnl Persuade glibc <math.h> to declare expf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether expf() exists. Assume that expf(), if it exists, is
   dnl defined in the same library as exp().
   save_LIBS="$LIBS"