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46 lines
1.5 KiB
46 lines
1.5 KiB
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_cxx_bool.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CXX_BOOL
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#
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# DESCRIPTION
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#
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# If the compiler recognizes bool as a separate built-in type, define
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# HAVE_BOOL. Note that a typedef is not a separate type since you cannot
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# overload a function such that it accepts either the basic type or the
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# typedef.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Todd Veldhuizen
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# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 8
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AU_ALIAS([AC_CXX_BOOL], [AX_CXX_BOOL])
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AC_DEFUN([AX_CXX_BOOL],
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[dnl
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AC_CACHE_CHECK(whether the compiler recognizes bool as a built-in type,
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ax_cv_cxx_bool,
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[dnl
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AC_LANG_PUSH([C++])
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AC_COMPILE_IFELSE([dnl
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AC_LANG_PROGRAM([int f(int x){return 1;}
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int f(char x){return 1;}
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int f(bool x){return 1;}],
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[bool b = true; return f(b);])],
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ax_cv_cxx_bool=yes, ax_cv_cxx_bool=no)
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AC_LANG_POP([C++])
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])
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AS_IF([test "X$ax_cv_cxx_bool" = Xyes],
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[AC_DEFINE(HAVE_BOOL,,[define if bool is a built-in type])])
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])
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