(In reply to Karl Tomlinson (ni?:karlt) from comment #122)
> Comment on attachment 8630422
> Replace g_slice_set_config() with G_SLICE environment variable
> 
> The g_type_init() call has been dropped.
> I don't know of a static constructor using GSlice in GLib 2.32.

Yeah, I was mistaken, I thought there was, but there isn't. Only
g_thread is initialized, not g_slice.

> >+#if defined(MOZ_WIDGET_GTK)
> >+#if !GLIB_CHECK_VERSION(2, 32, 0)
> 
> The compile time glib version check is contrary to our goal of compiling the
> same code irrespective of the compile environment.

I thought that too, and then I found a bunch of preprocessor glib
version checks (various GLIB_CHECK_VERSION in harfbuzz, and various
GLIB_MAJOR/MINOR_VERSION checks here and there, although, looking at
them, they are actually useless because they're for versions even older
than what we support ; harfbuzz does check for versions well above
2.18).

> Can this just be "if MOZ_WIDGET_GTK == 2" ?

sure
 
> I'd also be happy to drop support for G_SLICE=always-malloc on versions prior
> to 2.32 if that makes the g_thread_init situation simpler.  However, I don't
> know whether it is acceptable to call g_thread_init after g_type_init in
> versions prior to 2.24.

g_thread_init can be called multiple times in versions >= 2.24, and
gtype.c says, about g_type_init, "Since version 2.24 this also
initializes the thread system". So if we're okay with dropping G_SLICE
=always-malloc for versions 2.18 to 2.23 included, we should be able to
get away with only calling g_type_init. Another option would be to just
call g_slice_alloc/g_slice_free1, which will obviously initialize
gslice, and after all, sounds much simpler.

Thoughts?

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https://bugs.launchpad.net/bugs/1160569

Title:
  GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0'
  failed

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