unistd.h related problem when compiling bison & flex program under vc++
- by Eric
I'm using bison & flex (downloaded via cygwin) with vc++. When I compile the program I got an error:
...: fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory
The corresponding code in the flex-generated file is:
#ifndef YY_NO_UNISTD_H
/* Special case for "unistd.h", since it is non-ANSI. We include it way
* down here because we want the user's section 1 to have been scanned first.
* The user has a chance to override it with an option.
*/
/* %if-c-only */
#include <unistd.h>
/* %endif */
/* %if-c++-only */
/* %endif */
#endif
If I define YY_NO_UNISTD_H in the flex file(.l) this error will disappear, but I get several other errors:
...: error C2447: '{' : missing function header (old-style formal list?)
...: warning C4018: '<' : signed/unsigned mismatch
...: error C3861: 'isatty': identifier not found
How can I fix this problem?
All these errors occur in the flex-generated scanner.
I know it's because unistd.h doesn't exist in windows. Do I have to write my own unistd.h? If so how to write it in order to eliminate those errors?
