X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fisinf.m4;h=d18f367da9b3d205a15def683f3441348379bf94;hb=f76a70dc0244757b8aa890113e41fb2fe1da2244;hp=f6056e61034b9fb57d8600ff7b23a17bc2d98085;hpb=ef3ff90a39110bde148b63b18b997c317eee9751;p=gnulib.git

diff --git a/m4/isinf.m4 b/m4/isinf.m4
index f6056e610..d18f367da 100644
--- a/m4/isinf.m4
+++ b/m4/isinf.m4
@@ -1,4 +1,4 @@
-# isinf.m4 serial 4
+# isinf.m4 serial 6
 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -9,9 +9,9 @@ AC_DEFUN([gl_ISINF],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   dnl Persuade glibc <math.h> to declare isinf.
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
-  AC_CHECK_DECLS([isinf], , , [#include <math.h>])
+  AC_CHECK_DECLS([isinf], , , [[#include <math.h>]])
   if test "$ac_cv_have_decl_isinf" = yes; then
-    gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x);])
+    gl_CHECK_MATH_LIB([ISINF_LIBM], [x = isinf (x) + isinf ((float) x);])
     if test "$ISINF_LIBM" != missing; then
       dnl Test whether isinf() on 'long double' works.
       gl_ISINFL_WORKS