doc: use ASCII in .texi files where UTF-8 isn't needed

[gnulib.git] / m4 / copysignl.m4

diff --git a/m4/copysignl.m4 b/m4/copysignl.m4
index 80c7b18..a250a26 100644 (file)
--- a/m4/copysignl.m4
+++ b/m4/copysignl.m4
@@ -1,5 +1,5 @@
-# copysignl.m4 serial 2
-dnl Copyright (C) 2011 Free Software Foundation, Inc.
+# copysignl.m4 serial 3
+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_COPYSIGNL],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
 
+  dnl Persuade glibc <math.h> to declare copysignl().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Determine COPYSIGNL_LIBM.
   gl_MATHFUNC([copysignl], [long double], [(long double, long double)])
   if test $gl_cv_func_copysignl_no_libm = no \