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AC_CXX_BOOL
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.
1.3 (last modified: 2004-02-04)
Todd Veldhuizen and Luc Maisonobe <luc@spaceroots.org>
AC_DEFUN([AC_CXX_BOOL],
[AC_CACHE_CHECK(whether the compiler recognizes bool as a built-in type,
ac_cv_cxx_bool,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([
int f(int x){return 1;}
int f(char x){return 1;}
int f(bool x){return 1;}
],[bool b = true; return f(b);],
ac_cv_cxx_bool=yes, ac_cv_cxx_bool=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_bool" = yes; then
AC_DEFINE(HAVE_BOOL,,[define if bool is a built-in type])
fi
])