X-Git-Url: https://git.m6w6.name/?p=m6w6%2Fext-psi;a=blobdiff_plain;f=m4%2Fax_check_sign.m4;h=5c925c2c31e2ffa02bb69755b0b6d3a2f11a49b3;hp=244865f4ea4ea565860f1617ac8c41692f4bd676;hb=69fb17bcfa5ed9c32754fa143b59f4a4a2dd4bd8;hpb=ef5079cd02c9d8666f6b9336853d2ab393e33467

diff --git a/m4/ax_check_sign.m4 b/m4/ax_check_sign.m4
index 244865f..5c925c2 100644
--- a/m4/ax_check_sign.m4
+++ b/m4/ax_check_sign.m4
@@ -1,3 +1,42 @@
+# ===========================================================================
+#       http://www.gnu.org/software/autoconf-archive/ax_check_sign.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_SIGN (TYPE, [ACTION-IF-SIGNED], [ACTION-IF-UNSIGNED], [INCLUDES])
+#
+# DESCRIPTION
+#
+#   Checks whether TYPE is signed or not. If no INCLUDES are specified, the
+#   default includes are used. If ACTION-IF-SIGNED is given, it is
+#   additional shell code to execute when the type is signed. If
+#   ACTION-IF-UNSIGNED is given, it is executed when the type is unsigned.
+#
+#   This macro assumes that the type exists. Therefore the existence of the
+#   type should be checked before calling this macro. For example:
+#
+#     AC_CHECK_HEADERS([wchar.h])
+#     AC_CHECK_TYPE([wchar_t],,[ AC_MSG_ERROR([Type wchar_t not found.]) ])
+#     AX_CHECK_SIGN([wchar_t],
+#       [ AC_DEFINE(WCHAR_T_SIGNED, 1, [Define if wchar_t is signed]) ],
+#       [ AC_DEFINE(WCHAR_T_UNSIGNED, 1, [Define if wchar_t is unsigned]) ], [
+#     #ifdef HAVE_WCHAR_H
+#     #include <wchar.h>
+#     #endif
+#     ])
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Ville Laurikari <vl@iki.fi>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 6
+
 AC_DEFUN([AX_CHECK_SIGN], [
 	typename=`echo $1 | sed "s/@<:@^a-zA-Z0-9_@:>@/_/g"`
 	AC_CACHE_CHECK([whether $1 is signed], ax_cv_decl_${typename}_signed, [