Re: want to compile an example code.

That program compiles fine for me here.

What does the pkg-config command print if you just run:
	pkg-config --cflags --libs xcb

For me, it prints -lxcb, which should cause the compiler to link with the XCB
library that defines those functions.

	-Alan Coopersmith-               [email protected]
	 Oracle Solaris Engineering - https://blogs.oracle.com/alanc

On 10/5/20 6:23 AM, Hans Schüren wrote:
> Thank you Alan ,  i have tried it.
> 
> Please look at this session.
> I have chosen the very simple example from the XCB Manual :    could not stop 
> additional compiling errors.
> 
> =================================================================================
> 
> #include <unistd.h>      /* pause() */
> 
> #include <xcb/xcb.h>
> 
> int
> main ()
> {
>    xcb_connection_t *c;
>    xcb_screen_t     *screen;
>    xcb_window_t      win;
> 
>    /* Open the connection to the X server */
>    c = xcb_connect (NULL, NULL);
> 
>    /* Get the first screen */
>    screen = xcb_setup_roots_iterator (xcb_get_setup (c)).data;
> 
>    /* Ask for our window's Id */
>    win = xcb_generate_id(c);
> 
>    /* Create the window */
>    xcb_create_window (c,                             /* Connection          */
>                       XCB_COPY_FROM_PARENT,          /* depth (same as root)*/
>                       win,                           /* window Id           */
>                       screen->root,                  /* parent window       */
>                       0, 0,                          /* x, y                */
>                       150, 150,                      /* width, height       */
>                       10,                            /* border_width        */
>                       XCB_WINDOW_CLASS_INPUT_OUTPUT, /* class               */
>                       screen->root_visual,           /* visual              */
>                       0, NULL);                      /* masks, not used yet */
> 
>    /* Map the window on the screen */
>    xcb_map_window (c, win);
> 
>    /* Make sure commands are sent before we pause, so window is shown */
>    xcb_flush (c);
> 
>    pause ();    /* hold client until Ctrl-C */
> 
>    return 0;
> }
> 
> =================================================================================
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> nomad@NomadBSD ~/programmieren> ls
> barchart.c           include stdlibh.txt* includestdlibh.c     Motif/            
>     windowexample.c      xcbsample.c
> nomad@NomadBSD ~/programmieren> cc -Wall windowexample.c -o  windowexample 
> $(pkg-config --cflags --libs xcb) -I/usr/local/include/
> fish: $(...) is not supported. In fish, please use '(pkg-config)'.
> cc -Wall windowexample.c -o  windowexample $(pkg-config --cflags --libs xcb) 
> -I/usr/local/include/
>                                             ^
> nomad@NomadBSD ~/programmieren> cc -Wall windowexample.c -o  windowexample 
> '(pkg-config --cflags --libs xcb)' -I/usr/local/include/
> cc: error: no such file or directory: '(pkg-config --cflags --libs xcb)'
> nomad@NomadBSD ~/programmieren [1]> cc -Wall windowexample.c -o  windowexample 
> (pkg-config --cflags --libs xcb) -I/usr/local/include/
> ld: error: undefined symbol: xcb_connect
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> ld: error: undefined symbol: xcb_get_setup
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> ld: error: undefined symbol: xcb_setup_roots_iterator
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> ld: error: undefined symbol: xcb_generate_id
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> ld: error: undefined symbol: xcb_create_window
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> ld: error: undefined symbol: xcb_map_window
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> ld: error: undefined symbol: xcb_flush
>  >>> referenced by windowexample.c
>  >>>               /tmp/windowexample-2f744c.o:(main)
> cc: error: linker command failed with exit code 1 (use -v to see invocation)
> nomad@NomadBSD ~/programmieren [1]>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> don't know why theese errors appear in that small code example.
> 
> 
> 
> *Von:* Alan Coopersmith <[email protected]>
> *Gesendet:* 04.10.2020 22:55
> *An:* Hans Schüren <[email protected]>,<[email protected]>
> *Betreff:* Re: [Xcb] want to compile an example code.
> On 10/4/20 12:38 PM, Hans Schüren wrote:
>  > Hello,
>  >
>  > i want to compile a sample code from the XCB manual.
>  >
>  > There are the following errors. What can i do ?
>  >
>  > I use FreeBSD and have XCB installed.
>  >
>  > barchart.c   Motif/       xcbsample.c
>  > nomad@NomadBSD ~/programmieren> gcc -Wall xcbsample.c -o xcbsample  pkg-config
>  > --cflags --libs xcb
>  > fish: Unknown command: gcc
>  > nomad@NomadBSD ~/programmieren [127]> cc -Wall xcbsample.c -o xcbsample
>  > pkg-config --cflags --libs xcb
>  > cc: error: unsupported option '--cflags'
>  > cc: error: unsupported option '--libs'
>  > cc: error: no such file or directory: 'pkg-config'
>  > cc: error: no such file or directory: 'xcb'
> 
> You need to put $( ) or ` ` around the pkg-config command so that the
> output of the pkg-config command is used as flags to the compiler:
> 
> cc -Wall xcbsample.c -o xcbsample $(pkg-config --cflags --libs xcb)
> 
> or
> 
> cc -Wall xcbsample.c -o xcbsample `pkg-config --cflags --libs xcb`
> 
> (It depends on what shell you use - the first is preferred for most shells,
> but some old shells like csh may require the second form.)
> 
> --
> -Alan Coopersmith- [email protected] <mailto:[email protected]>
> Oracle Solaris Engineering - https://blogs.oracle.com/alanc 
> <https://blogs.oracle.com/alanc>
> _______________________________________________
> Xcb mailing list
> [email protected] <mailto:[email protected]>
> https://lists.freedesktop.org/mailman/listinfo/xcb 
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