Merge commit 'a39d4083cab589d7cd6a13e8a4b8db8875261d75'

[gnulib.git] / m4 / expf.m4

diff --git a/m4/expf.m4 b/m4/expf.m4
index 0a9b4c9..c7b98c9 100644 (file)
--- a/m4/expf.m4
+++ b/m4/expf.m4
@@ -1,5 +1,5 @@
-# expf.m4 serial 1
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# expf.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_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"