g_type_ensure has a large comment saying _get_type shouldn't be
marked with G_GNUC_CONST because it has side-effects on the first
run, but it's OK if you consistently call g_type_ensure first.
Unfortunately, this isn't accurate. GCC trunk (observed at r17-1725-ge259a182e1f100)
now analyses points-to information more effectively and propagates its
findings, so it sees the function modifies some global state, concludes
that can't be possible (because of the const attribute), and deletes
the stores.
pure unfortunately is unsuitable for *_get_type too as it has a side-effect
(writes to global memory).
Mesa had a similar issue which I fixed recently [0]. glib and glibmm likely
want the (not-yet-implemented) 'idempotent' attribute instead [1]. In fact,
this exact problem is what motivated that request! :)
ebassi mentions an alternative to the current setup as well, using
atomics [2].
This problem has gone back many years but the compiler has finally
fully outsmarted us here, so give in.
[0] https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/42361
[1] https://gcc.gnu.org/PR32911
[2] https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4249#note_2583110
Fixes: https://gitlab.gnome.org/GNOME/glib/-/work_items/3984
Signed-off-by: Sam James <sam@gentoo.org>
Add SPDX license (but not copyright) headers to all files which follow a
certain pattern in their existing non-machine-readable header comment.
This commit was entirely generated using the command:
```
git ls-files gio/*.[ch] | xargs perl -0777 -pi -e 's/\n \*\n \* This library is free software; you can redistribute it and\/or\n \* modify it under the terms of the GNU Lesser General Public/\n \*\n \* SPDX-License-Identifier: LGPL-2.1-or-later\n \*\n \* This library is free software; you can redistribute it and\/or\n \* modify it under the terms of the GNU Lesser General Public/igs'
```
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #1415
Add the GLIB_AVAILABLE_IN_ALL annotation to all old functions (that
haven't already been annotated with the GLIB_AVAILABLE_IN_* macros or a
deprecation macro).
If we discover in the future that we cannot use only one macro on
Windows, it will be an easy sed patch to fix that.
https://bugzilla.gnome.org/show_bug.cgi?id=688681
