1# =========================================================================== 2# https://www.gnu.org/software/autoconf-archive/ax_cxx_bool.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_CXX_BOOL 8# 9# DESCRIPTION 10# 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 14# typedef. 15# 16# LICENSE 17# 18# Copyright (c) 2008 Todd Veldhuizen 19# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org> 20# 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 24# warranty. 25 26#serial 8 27 28AU_ALIAS([AC_CXX_BOOL], [AX_CXX_BOOL]) 29AC_DEFUN([AX_CXX_BOOL], 30[dnl 31 AC_CACHE_CHECK(whether the compiler recognizes bool as a built-in type, 32 ax_cv_cxx_bool, 33 [dnl 34 AC_LANG_PUSH([C++]) 35 AC_COMPILE_IFELSE([dnl 36 AC_LANG_PROGRAM([int f(int x){return 1;} 37 int f(char x){return 1;} 38 int f(bool x){return 1;}], 39 [bool b = true; return f(b);])], 40 ax_cv_cxx_bool=yes, ax_cv_cxx_bool=no) 41 AC_LANG_POP([C++]) 42 ]) 43 AS_IF([test "X$ax_cv_cxx_bool" = Xyes], 44 [AC_DEFINE(HAVE_BOOL,,[define if bool is a built-in type])]) 45]) 46