1 # ===========================================================================
2 # http://www.gnu.org/software/autoconf-archive/ax_cxx_bool.html
3 # ===========================================================================
11 # If the compiler recognizes bool as a separate built-in type, define
12 # HAVE_BOOL. Note that a typedef is not a separate type since you cannot
13 # overload a function such that it accepts either the basic type or the
18 # Copyright (c) 2008 Todd Veldhuizen
19 # Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
21 # Copying and distribution of this file, with or without modification, are
22 # permitted in any medium without royalty provided the copyright notice
23 # and this notice are preserved. This file is offered as-is, without any
28 AU_ALIAS([AC_CXX_BOOL], [AX_CXX_BOOL])
29 AC_DEFUN([AX_CXX_BOOL],
30 [AC_CACHE_CHECK(whether the compiler recognizes bool as a built-in type,
35 int f(int x){return 1;}
36 int f(char x){return 1;}
37 int f(bool x){return 1;}
38 ],[bool b = true; return f(b);],
39 ax_cv_cxx_bool=yes, ax_cv_cxx_bool=no)
42 if test "$ax_cv_cxx_bool" = yes; then
43 AC_DEFINE(HAVE_BOOL,,[define if bool is a built-in type])