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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_TYPE([wchar_t],,[ AC_MSG_ERROR([Type wchar_t not found.]) ])
    [ 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>

Source Code

Download the latest version of ax_check_sign.m4 or browse the macro’s revision history.


Copyright © 2008 Ville Laurikari

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.