Newbie: vala app builds & runs fine but lots of C errors are output 0.56 vs 0.48

Platform Language bindings
1

I have a small single file vala test app ~100 lines. It compiles & runs fine but during compilation I get lots of errors. I’m on Ubuntu 22.04:

$ valac --version
Vala 0.56.0
$ valac -o wordladder --pkg gee-0.8 --pkg gio-2.0 wordladder.vala
In file included from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from /home/mark/app/vala/wordladder/wordladder.vala.c:9:
/home/mark/app/vala/wordladder/wordladder.vala.c: In function ‘word_set_get_type’:
/usr/include/glib-2.0/glib/gatomic.h:113:5: warning: argument 2 of ‘__atomic_load’ discards ‘volatile’ qualifier [-Wincompatible-pointer-types]
  113 |     __atomic_load (gapg_temp_atomic, &gapg_temp_newval, __ATOMIC_SEQ_CST); \
      |     ^~~~~~~~~~~~~
/usr/include/glib-2.0/glib/gthread.h:260:7: note: in expansion of macro ‘g_atomic_pointer_get’
  260 |     (!g_atomic_pointer_get (location) &&                             \
      |       ^~~~~~~~~~~~~~~~~~~~
/home/mark/app/vala/wordladder/wordladder.vala.c:160:13: note: in expansion of macro ‘g_once_init_enter’
  160 |         if (g_once_init_enter (&word_set_type_id__once)) {
      |             ^~~~~~~~~~~~~~~~~
/home/mark/app/vala/wordladder/wordladder.vala.c: In function ‘word_list_get_type’:
/usr/include/glib-2.0/glib/gatomic.h:113:5: warning: argument 2 of ‘__atomic_load’ discards ‘volatile’ qualifier [-Wincompatible-pointer-types]
  113 |     __atomic_load (gapg_temp_atomic, &gapg_temp_newval, __ATOMIC_SEQ_CST); \
      |     ^~~~~~~~~~~~~
/usr/include/glib-2.0/glib/gthread.h:260:7: note: in expansion of macro ‘g_atomic_pointer_get’
  260 |     (!g_atomic_pointer_get (location) &&                             \
      |       ^~~~~~~~~~~~~~~~~~~~
/home/mark/app/vala/wordladder/wordladder.vala.c:208:13: note: in expansion of macro ‘g_once_init_enter’
  208 |         if (g_once_init_enter (&word_list_type_id__once)) {
      |             ^~~~~~~~~~~~~~~~~
/home/mark/app/vala/wordladder/wordladder.vala.c: In function ‘_thread_safe_regex_init’:
/usr/include/glib-2.0/glib/gatomic.h:113:5: warning: argument 2 of ‘__atomic_load’ discards ‘volatile’ qualifier [-Wincompatible-pointer-types]
  113 |     __atomic_load (gapg_temp_atomic, &gapg_temp_newval, __ATOMIC_SEQ_CST); \
      |     ^~~~~~~~~~~~~
/usr/include/glib-2.0/glib/gthread.h:260:7: note: in expansion of macro ‘g_atomic_pointer_get’
  260 |     (!g_atomic_pointer_get (location) &&                             \
      |       ^~~~~~~~~~~~~~~~~~~~
/home/mark/app/vala/wordladder/wordladder.vala.c:333:13: note: in expansion of macro ‘g_once_init_enter’
  333 |         if (g_once_init_enter ((volatile gsize*) re)) {
      |             ^~~~~~~~~~~~~~~~~

When I build using Vala 0.48.17 on Debian 11, there are no error messages at all.
So am I right to assume these errors are nothing to worry about?
Oh, if you want to see the source it is on github.

2

Yes. These warnings are normal and nothing to worry about. Although usually they are turned off, so you don’t get them, like you saw in Debian 11. I would say you should open an issue on the ubuntu package.

3

The code generated by Vala should drop the “volatile” modifier, if that’s not the case already.

4

OK, thanks!
(this is to make up the 20 char min.)

5

In addition, your project’s build system should silence C compiler warnings using -w (unless you happen to be working on making valac output code that produces fewer warnings). Hoping that valac will generate C code that doesn’t emit warnings is not realistic, and you want clean output so that you can focus on Vala warnings instead.

1 Like
6

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.