Re: header file for cchar_t?

[Thomas Dickey]

On Fri, 8 Jul 2011, Clemens Ladisch wrote:

> Felix Natter wrote:
> > When trying to compile:
> > ------------
> > #include <wchar.h>
> > #include <stdlib.h>
> > #include <stdio.h>
> > #include <string.h>
> > #include <locale.h>
> > #include <ncursesw/curses.h>
> > ...
> > with ncursesw 5.9 I get:
> >
> > gcc -Wall -O0 -g -lncursesw -o t testUTF8-3.c
> > testUTF8-3.c: In function ‘main’:
> > testUTF8-3.c:30:3: warning: implicit declaration of function ‘addwstr’ 
> > [-Wimplicit-function-declaration]
>
> <http://pubs.opengroup.org/onlinepubs/007908799/xcurses/implement.html> says:
> | Applications should ensure that the feature test macro _XOPEN_SOURCE
> | is defined before inclusion of any header.  [...]  An application that
> | uses any API specified as ENHANCED CURSES or relies on any portion of
> | this specification marked with the EC margin legend must define
> | _XOPEN_SOURCE_EXTENDED = 1 in each source file or as part of its
> | compilation environment. When _XOPEN_SOURCE_EXTENDED = 1 is defined in
> | a source file, it must appear before any header is included.

right.  _XOPEN_SOURCE itself is (across various platforms) usually defined
in an untidy mess that is intertwined with other symbols.  But 
_XOPEN_SOURCE_EXTENDED is something that you usually have to add yourself.

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net