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https://bugzilla.gnome.org/show_bug.cgi?id=793961

WARNING: Trying to compare values of different types (str, int).
The result of this is undefined and will become a hard error
in a future Meson release.

https://bugzilla.gnome.org/show_bug.cgi?id=769183

The difference between mmap and mmap64 is the type of 'offset' argument.
mmap64 always uses a 64-bit interger as offset, while mmap uses off_t,
whose size can vary on different operating systems or architectures.

However, not all operating systems support mmap64. Fortunately, although
FreeBSD only has mmap, its off_t is always 64-bit regardless of
architectures, so we can simply use mmap when sizeof(off_t) == 8.

https://bugzilla.gnome.org/show_bug.cgi?id=791779

mmap64 is not available on FreeBSD.

https://bugzilla.gnome.org/show_bug.cgi?id=791779

Only plugin entry points should be exported.

Currently plugins might export more symbols with
the meson build, as we don't have the exports
regexp there that we pass to libtool.

https://bugzilla.gnome.org/show_bug.cgi?id=783198

https://bugzilla.gnome.org/show_bug.cgi?id=784082

Even though hooked up to the build system, it's clear that no one
has ever built or used this with GStreamer 1.x. It wants to link
against libgstinterfaces, which no longer exists. And uses 0.10-style
raw audio caps. And the last meaningful change was done in 2009.
Let's just remove it.

It's only needed for the taglib plugin which is optional.

https://bugzilla.gnome.org/show_bug.cgi?id=782172

The functions from math.h may be implemented in libm.

https://bugzilla.gnome.org/show_bug.cgi?id=774876

https://bugzilla.gnome.org/show_bug.cgi?id=774656

https://bugzilla.gnome.org/show_bug.cgi?id=773568

These checks are done inside the meson.build files for each plugin.

https://bugzilla.gnome.org/show_bug.cgi?id=773114

This reverts commit 46632694.

Does not actually work. See:
https://bugzilla.gnome.org/show_bug.cgi?id=773114#c31

https://bugzilla.gnome.org/show_bug.cgi?id=773114

Use the default for each compiler on every platform instead. This
improves our compatibility with compilers that don't have gnu99 as
a c_std.

Workaround source_root being the root directory of all projects in the subproject
case and remove now unneeded getpluginsdir

Bump meson requirement to 0.35