Commit 2cb5d2a4 removed setlocale() for everything except LC_MESSAGES in order to avoid unwanted side effects such as using the wrong decimal separator in generated JSON objects. However, the problem that unsetting LC_CTYPE caused is that non-ASCII characters are considered non-printable now and therefore the GTK menus display question marks for accented letters, Chinese characters etc.
A first attempt to fix this [1] was rejected because even just setting LC_CTYPE to the user's locale (and thereby modifying the semantics of the ctype.h functions) could have unwanted effects that we're not aware of yet. Recently, however, glibc introduced a new locale "C.utf-8" that just uses UTF-8 as its charset, but otherwise leaves the semantics alone. Just setting the right character set is enough for our use case, so we can just hardcode this one without having to be afraid of nasty side effects. Older systems that don't have the new locale will continue displaying question marks, but this should fix the problem for most users. [1] https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg03591.html ('Re: gtk: use setlocale() for LC_MESSAGES only') Signed-off-by: Kevin Wolf <kw...@redhat.com> --- I happened to talk to Mike Fabian of our Internationalization team at devconf.cz and mentioned our problem, and this is the solution that he suggested. I hope we can finally get things back into a non-broken state with this. :-) ui/gtk.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/ui/gtk.c b/ui/gtk.c index 86368e3..8330762 100644 --- a/ui/gtk.c +++ b/ui/gtk.c @@ -2205,8 +2205,12 @@ void gtk_display_init(DisplayState *ds, bool full_screen, bool grab_on_hover) s->free_scale = FALSE; - /* LC_MESSAGES only. See early_gtk_display_init() for details */ + /* Mostly LC_MESSAGES only. See early_gtk_display_init() for details. For + * LC_CTYPE, we need to make sure that non-ASCII characters are considered + * printable, but without changing any of the character classes to make + * sure that we don't accidentally break implicit assumptions. */ setlocale(LC_MESSAGES, ""); + setlocale(LC_CTYPE, "C.utf-8"); bindtextdomain("qemu", CONFIG_QEMU_LOCALEDIR); textdomain("qemu"); -- 2.9.3
