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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_bool.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_BOOL
#
# DESCRIPTION
#
# If the compiler recognizes bool as a separate built-in type, define
# HAVE_BOOL. Note that a typedef is not a separate type since you cannot
# overload a function such that it accepts either the basic type or the
# typedef.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# 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 8
AU_ALIAS([AC_CXX_BOOL], [AX_CXX_BOOL])
AC_DEFUN([AX_CXX_BOOL],
[dnl
AC_CACHE_CHECK(whether the compiler recognizes bool as a built-in type,
ax_cv_cxx_bool,
[dnl
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([dnl
AC_LANG_PROGRAM([int f(int x){return 1;}
int f(char x){return 1;}
int f(bool x){return 1;}],
[bool b = true; return f(b);])],
ax_cv_cxx_bool=yes, ax_cv_cxx_bool=no)
AC_LANG_POP([C++])
])
AS_IF([test "X$ax_cv_cxx_bool" = Xyes],
[AC_DEFINE(HAVE_BOOL,,[define if bool is a built-in type])])
])
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