pipe: Set errno upon failure.

[gnulib.git] / m4 / isnand.m4

diff --git a/m4/isnand.m4 b/m4/isnand.m4
index fbb03f8..cd91628 100644 (file)
--- a/m4/isnand.m4
+++ b/m4/isnand.m4
@@ -1,12 +1,14 @@
-# isnand.m4 serial 4
-dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+# isnand.m4 serial 6
+dnl Copyright (C) 2007-2010 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.
 
 dnl Check how to get or define isnand().
+
 AC_DEFUN([gl_FUNC_ISNAND],
 [
+  AC_REQUIRE([gl_MATH_H_DEFAULTS])
   ISNAND_LIBM=
   gl_HAVE_ISNAND_NO_LIBM
   if test $gl_cv_func_isnand_no_libm = no; then
@@ -19,10 +21,9 @@ AC_DEFUN([gl_FUNC_ISNAND],
   if test $gl_cv_func_isnand_no_libm = yes \
      || test $gl_cv_func_isnand_in_libm = yes; then
     gl_func_isnand=yes
-    AC_DEFINE([HAVE_ISNAND], 1,
-      [Define if the isnan(double) function is available.])
   else
     gl_func_isnand=no
+    HAVE_ISNAND=0
     gl_BUILD_ISNAND
   fi
   AC_SUBST([ISNAND_LIBM])
@@ -34,7 +35,7 @@ AC_DEFUN([gl_FUNC_ISNAND_NO_LIBM],
 [
   gl_HAVE_ISNAND_NO_LIBM
   if test $gl_cv_func_isnand_no_libm = yes; then
-    AC_DEFINE([HAVE_ISNAND_IN_LIBC], 1,
+    AC_DEFINE([HAVE_ISNAND_IN_LIBC], [1],
       [Define if the isnan(double) function is available in libc.])
   else
     gl_BUILD_ISNAND