Re: Introducing emacs-webkit and more thoughts on Emacs rendering (was Rethinking the design of xwidgets)

[Jean Louis]

* tomas@tuxteam.de <tomas@tuxteam.de> [2020-11-22 19:24]:
> > > Uh, oh. You seem to be missing fundamental packages for compiling
> > > things. "malloc", for example is declared in /usr/include/stdlib.h
> > > 
> > > Does this file exist on your machine? If not, you'll have to look
> > > for it. If yes, you'll have to adapt your compile options for your
> > > compiler to find it.
> > 
> > Yes, it does.
> 
> except when it doesn't :)

You know that all better, thank you. 

I do remember being able to compile webkit in Emacs by compiling Emacs
itself, but it did not work as expected and I removed it.

$ locate stdlib.h
/usr/include/stdlib.h

but webkit-module.c inside of emacs-webkit git directory does not have
stdlib.h, there is nowhere in other files included. And I included
also string.h that was missing.

$ head webkit-module.c 
#define _POSIX_SOURCE 1

#include <gtk/gtk.h>
#include <webkit2/webkit2.h>
#include <stdbool.h>
#include <signal.h>
#include <assert.h>
#include <errno.h>

I think it should be included there and I have included those missind
but then I got these other errors. Maybe my webkit is outdated for
this one. I cannot install new webkit on this system.

webkit-module.c: In function ‘webkit_get_uri’:
webkit-module.c:147:26: warning: implicit declaration of function 
‘webkit_uri_for_display’ [-Wimplicit-function-declaration]
       const gchar *uri = webkit_uri_for_display (webkit_web_view_get_uri
                          ^~~~~~~~~~~~~~~~~~~~~~
webkit-module.c:147:26: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
webkit-module.c: In function ‘webkit_js_finished’:
webkit-module.c:362:3: error: unknown type name ‘JSCValue’
   JSCValue *value = webkit_javascript_result_get_js_value (js_result);
   ^~~~~~~~
webkit-module.c:362:21: warning: implicit declaration of function 
‘webkit_javascript_result_get_js_value’ [-Wimplicit-function-declaration]
   JSCValue *value = webkit_javascript_result_get_js_value (js_result);
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
webkit-module.c:362:21: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
webkit-module.c:363:17: warning: implicit declaration of function 
‘jsc_value_to_json’ [-Wimplicit-function-declaration]
   gchar *json = jsc_value_to_json (value, 1);
                 ^~~~~~~~~~~~~~~~~
webkit-module.c:363:17: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
webkit-module.c:364:3: error: unknown type name ‘JSCException’
   JSCException *exception =
   ^~~~~~~~~~~~
webkit-module.c:365:5: warning: implicit declaration of function 
‘jsc_context_get_exception’ [-Wimplicit-function-declaration]
     jsc_context_get_exception (jsc_value_get_context (value));
     ^~~~~~~~~~~~~~~~~~~~~~~~~
webkit-module.c:365:32: warning: implicit declaration of function 
‘jsc_value_get_context’ [-Wimplicit-function-declaration]
     jsc_context_get_exception (jsc_value_get_context (value));
                                ^~~~~~~~~~~~~~~~~~~~~
webkit-module.c:365:5: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
     jsc_context_get_exception (jsc_value_get_context (value));
     ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/glib-2.0/glib.h:62:0,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from webkit-module.c:3:
webkit-module.c:368:16: warning: implicit declaration of function 
‘jsc_exception_get_message’ [-Wimplicit-function-declaration]
                jsc_exception_get_message (exception));
                ^
/usr/include/glib-2.0/glib/gmessages.h:336:32: note: in definition of macro 
‘g_warning’
                                __VA_ARGS__)
                                ^~~~~~~~~~~
webkit-module.c:367:16: warning: format ‘%s’ expects argument of type ‘char *’, 
but argument 4 has type ‘int’ [-Wformat=]
     g_warning ("Error running javascript: %s",
                ^
/usr/include/glib-2.0/glib/gmessages.h:336:32: note: in definition of macro 
‘g_warning’
                                __VA_ARGS__)
                                ^~~~~~~~~~~
webkit-module.c: In function ‘webkit_script_message_cb’:
webkit-module.c:503:3: error: unknown type name ‘JSCValue’
   JSCValue *value = webkit_javascript_result_get_js_value (js_result);
   ^~~~~~~~
webkit-module.c:503:21: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
   JSCValue *value = webkit_javascript_result_get_js_value (js_result);
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
webkit-module.c:504:17: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
   gchar *json = jsc_value_to_json (value, 1);
                 ^~~~~~~~~~~~~~~~~
webkit-module.c:505:3: error: unknown type name ‘JSCException’
   JSCException *exception =
   ^~~~~~~~~~~~
webkit-module.c:506:5: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
     jsc_context_get_exception (jsc_value_get_context (value));
     ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/glib-2.0/glib.h:62:0,
                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
                 from webkit-module.c:3:
webkit-module.c:508:16: warning: format ‘%s’ expects argument of type ‘char *’, 
but argument 4 has type ‘int’ [-Wformat=]
     g_warning ("Error in javascript message recieve: %s",
                ^
/usr/include/glib-2.0/glib/gmessages.h:336:32: note: in definition of macro 
‘g_warning’
                                __VA_ARGS__)
                                ^~~~~~~~~~~
webkit-module.c: In function ‘webview_notify_uri’:
webkit-module.c:614:22: warning: initialization makes pointer from integer 
without a cast [-Wint-conversion]
   const gchar *uri = webkit_uri_for_display (webkit_web_view_get_uri 
(webview));
                      ^~~~~~~~~~~~~~~~~~~~~~
make: *** [Makefile:10: webkit-module.so] Error 1