Macro: ac_cxx_bool

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Synopsis

  `AC_CXX_BOOL`

Version

  1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.39

Author

  Luc Maisonobe

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.

M4 Source Code

      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
      ])