v8.2.0826 produces incompatible pointer type warnings in if_ruby.c on Ubuntu 20.04 LTS

[mgedmin]

Describe the bug

Compiling vim v8.2.0826 on Ubuntu 20.04 LTS produces these compilation warnings:

gcc -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK  -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/x86_64-linux-gnu/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/uuid -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include   -g -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1        -o objects/channel.o channel.c
In file included from /usr/include/ruby-2.7.0/ruby/ruby.h:2148,
                 from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
if_ruby.c: In function ‘ruby_vim_init’:
/usr/include/ruby-2.7.0/ruby/intern.h:1218:137: warning: passing argument 3 of ‘rb_define_singleton_method0’ from incompatible pointer type [-Wincompatible-pointer-types]
 1218 | #define rb_define_singleton_method(klass, mid, func, arity) rb_define_singleton_method_choose_prototypem3((arity),(func))((klass),(mid),(func),(arity));
      |                                                                                                                                         ^~~~~~
      |                                                                                                                                         |
      |                                                                                                                                         VALUE (*)(void) {aka long unsigned int (*)(void)}
if_ruby.c:1760:5: note: in expansion of macro ‘rb_define_singleton_method’
 1760 |     rb_define_singleton_method(cBuffer, "current", buffer_s_current, 0);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:27: note: expected ‘VALUE (*)(VALUE)’ {aka ‘long unsigned int (*)(long unsigned int)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1042:82: note: in definition of macro ‘RB_METHOD_DEFINITION_DECL_C’
 1042 |     __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
      |                                                                                  ^~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1074:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL_1’
 1074 | RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##0 ,0 ,decl,vars,(VALUE)) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL’
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1218:137: warning: passing argument 3 of ‘rb_define_singleton_method0’ from incompatible pointer type [-Wincompatible-pointer-types]
 1218 | #define rb_define_singleton_method(klass, mid, func, arity) rb_define_singleton_method_choose_prototypem3((arity),(func))((klass),(mid),(func),(arity));
      |                                                                                                                                         ^~~~~~
      |                                                                                                                                         |
      |                                                                                                                                         VALUE (*)(void) {aka long unsigned int (*)(void)}
if_ruby.c:1761:5: note: in expansion of macro ‘rb_define_singleton_method’
 1761 |     rb_define_singleton_method(cBuffer, "count", buffer_s_count, 0);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:27: note: expected ‘VALUE (*)(VALUE)’ {aka ‘long unsigned int (*)(long unsigned int)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1042:82: note: in definition of macro ‘RB_METHOD_DEFINITION_DECL_C’
 1042 |     __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
      |                                                                                  ^~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1074:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL_1’
 1074 | RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##0 ,0 ,decl,vars,(VALUE)) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL’
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
/usr/include/ruby-2.7.0/ruby/ruby.h:2799:117: warning: passing argument 3 of ‘rb_define_method0’ from incompatible pointer type [-Wincompatible-pointer-types]
 2799 | #define rb_define_method(klass, mid, func, arity) rb_define_method_choose_prototypem3((arity),(func))((klass),(mid),(func),(arity));
      |                                                                                                                     ^~~~~~
      |                                                                                                                     |
      |                                                                                                                     VALUE (*)(void) {aka long unsigned int (*)(void)}
if_ruby.c:1774:5: note: in expansion of macro ‘rb_define_method’
 1774 |     rb_define_method(cBuffer, "line_number", current_line_number, 0);
      |     ^~~~~~~~~~~~~~~~
In file included from /usr/include/ruby-2.7.0/ruby/ruby.h:2148,
                 from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
/usr/include/ruby-2.7.0/ruby/ruby.h:2775:27: note: expected ‘VALUE (*)(VALUE)’ {aka ‘long unsigned int (*)(long unsigned int)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 2775 | RB_METHOD_DEFINITION_DECL(rb_define_method, (2,3), (VALUE klass, const char *name), (klass, name))
      |                           ^~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1042:82: note: in definition of macro ‘RB_METHOD_DEFINITION_DECL_C’
 1042 |     __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
      |                                                                                  ^~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1074:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL_1’
 1074 | RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##0 ,0 ,decl,vars,(VALUE)) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/ruby.h:2775:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL’
 2775 | RB_METHOD_DEFINITION_DECL(rb_define_method, (2,3), (VALUE klass, const char *name), (klass, name))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
/usr/include/ruby-2.7.0/ruby/ruby.h:2799:117: warning: passing argument 3 of ‘rb_define_method0’ from incompatible pointer type [-Wincompatible-pointer-types]
 2799 | #define rb_define_method(klass, mid, func, arity) rb_define_method_choose_prototypem3((arity),(func))((klass),(mid),(func),(arity));
      |                                                                                                                     ^~~~~~
      |                                                                                                                     |
      |                                                                                                                     VALUE (*)(void) {aka long unsigned int (*)(void)}
if_ruby.c:1775:5: note: in expansion of macro ‘rb_define_method’
 1775 |     rb_define_method(cBuffer, "line", line_s_current, 0);
      |     ^~~~~~~~~~~~~~~~
In file included from /usr/include/ruby-2.7.0/ruby/ruby.h:2148,
                 from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
/usr/include/ruby-2.7.0/ruby/ruby.h:2775:27: note: expected ‘VALUE (*)(VALUE)’ {aka ‘long unsigned int (*)(long unsigned int)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 2775 | RB_METHOD_DEFINITION_DECL(rb_define_method, (2,3), (VALUE klass, const char *name), (klass, name))
      |                           ^~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1042:82: note: in definition of macro ‘RB_METHOD_DEFINITION_DECL_C’
 1042 |     __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
      |                                                                                  ^~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1074:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL_1’
 1074 | RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##0 ,0 ,decl,vars,(VALUE)) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/ruby.h:2775:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL’
 2775 | RB_METHOD_DEFINITION_DECL(rb_define_method, (2,3), (VALUE klass, const char *name), (klass, name))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1218:137: warning: passing argument 3 of ‘rb_define_singleton_method0’ from incompatible pointer type [-Wincompatible-pointer-types]
 1218 | #define rb_define_singleton_method(klass, mid, func, arity) rb_define_singleton_method_choose_prototypem3((arity),(func))((klass),(mid),(func),(arity));
      |                                                                                                                                         ^~~~~~
      |                                                                                                                                         |
      |                                                                                                                                         VALUE (*)(void) {aka long unsigned int (*)(void)}
if_ruby.c:1780:5: note: in expansion of macro ‘rb_define_singleton_method’
 1780 |     rb_define_singleton_method(cVimWindow, "current", window_s_current, 0);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:27: note: expected ‘VALUE (*)(VALUE)’ {aka ‘long unsigned int (*)(long unsigned int)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1042:82: note: in definition of macro ‘RB_METHOD_DEFINITION_DECL_C’
 1042 |     __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
      |                                                                                  ^~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1074:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL_1’
 1074 | RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##0 ,0 ,decl,vars,(VALUE)) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL’
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1218:137: warning: passing argument 3 of ‘rb_define_singleton_method0’ from incompatible pointer type [-Wincompatible-pointer-types]
 1218 | #define rb_define_singleton_method(klass, mid, func, arity) rb_define_singleton_method_choose_prototypem3((arity),(func))((klass),(mid),(func),(arity));
      |                                                                                                                                         ^~~~~~
      |                                                                                                                                         |
      |                                                                                                                                         VALUE (*)(void) {aka long unsigned int (*)(void)}
if_ruby.c:1781:5: note: in expansion of macro ‘rb_define_singleton_method’
 1781 |     rb_define_singleton_method(cVimWindow, "count", window_s_count, 0);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:27: note: expected ‘VALUE (*)(VALUE)’ {aka ‘long unsigned int (*)(long unsigned int)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1042:82: note: in definition of macro ‘RB_METHOD_DEFINITION_DECL_C’
 1042 |     __attribute__((__unused__,__weakref__(#def),__nonnull__ nonnull))static void defname(RB_UNWRAP_MACRO decl,VALUE(*func)funcargs,int arity);
      |                                                                                  ^~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1074:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL_1’
 1074 | RB_METHOD_DEFINITION_DECL_1(def,nonnull,def##0 ,0 ,decl,vars,(VALUE)) \
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/ruby-2.7.0/ruby/intern.h:1195:1: note: in expansion of macro ‘RB_METHOD_DEFINITION_DECL’
 1195 | RB_METHOD_DEFINITION_DECL(rb_define_singleton_method, (2,3), (VALUE klass, const char *name), (klass, name))
      | ^~~~~~~~~~~~~~~~~~~~~~~~~
if_ruby.c:1791:43: warning: passing argument 2 of ‘rb_define_virtual_variable’ from incompatible pointer type [-Wincompatible-pointer-types]
 1791 |     rb_define_virtual_variable("$curbuf", buffer_s_current, 0);
      |                                           ^~~~~~~~~~~~~~~~
      |                                           |
      |                                           VALUE (*)(void) {aka long unsigned int (*)(void)}
In file included from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
/usr/include/ruby-2.7.0/ruby/ruby.h:1801:45: note: expected ‘VALUE (*)(ID,  VALUE *)’ {aka ‘long unsigned int (*)(long unsigned int,  long unsigned int *)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 1801 | void rb_define_virtual_variable(const char*,rb_gvar_getter_t*,rb_gvar_setter_t*);
      |                                             ^~~~~~~~~~~~~~~~~
if_ruby.c:1792:43: warning: passing argument 2 of ‘rb_define_virtual_variable’ from incompatible pointer type [-Wincompatible-pointer-types]
 1792 |     rb_define_virtual_variable("$curwin", window_s_current, 0);
      |                                           ^~~~~~~~~~~~~~~~
      |                                           |
      |                                           VALUE (*)(void) {aka long unsigned int (*)(void)}
In file included from /usr/include/ruby-2.7.0/ruby.h:33,
                 from if_ruby.c:108:
/usr/include/ruby-2.7.0/ruby/ruby.h:1801:45: note: expected ‘VALUE (*)(ID,  VALUE *)’ {aka ‘long unsigned int (*)(long unsigned int,  long unsigned int *)’} but argument is of type ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’}
 1801 | void rb_define_virtual_variable(const char*,rb_gvar_getter_t*,rb_gvar_setter_t*);
      |                                             ^~~~~~~~~~~~~~~~~

I thought you might want to know.

[chrisbra]

can you provide a patch?

[mgedmin]

Sadly, no: I'm insufficiently familiar with C and Ruby to figure out what's going on here.