X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fsqrtf.m4;h=c2e09ea3749d3281702dddeb7e4fa37b170edd1a;hb=270e2d3e2966d9a5bc16dd0b367b71740b8994d5;hp=962a9261f7bacde8f8a32c7d47665dc94a3ca9a2;hpb=6a586a91c909c2dde4390037f5ee672978075b49;p=gnulib.git

diff --git a/m4/sqrtf.m4 b/m4/sqrtf.m4
index 962a9261f..c2e09ea37 100644
--- a/m4/sqrtf.m4
+++ b/m4/sqrtf.m4
@@ -1,5 +1,5 @@
-# sqrtf.m4 serial 1
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# sqrtf.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,
 dnl with or without modifications, as long as this notice is preserved.
@@ -9,6 +9,9 @@ AC_DEFUN([gl_FUNC_SQRTF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_FUNC_SQRT])
 
+  dnl Persuade glibc <math.h> to declare sqrtf().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether sqrtf() exists. Assume that sqrtf(), if it exists, is
   dnl defined in the same library as sqrt().
   save_LIBS="$LIBS"