[Buildroot] [PATCH] gst-fsl-plugins: fix includes for recent toolchains

[Yann E. MORIN <yann.morin.1998@free.fr>]

Gary, All,

On 2014-07-24 23:42 -0700, Gary Bisson spake thusly:
> Build was failing starting with CodeSourcery 2013.11 due to
> new v4l kernel headers.
> 
> Signed-off-by: Gary Bisson <bisson.gary@gmail.com>
> 
> ---
> Yann, all,
> I know this patch will look bad as we already discussed the use of -I instead of -idirafter.

[can you wrap lines at < ~80 chars, please?]

Indeed. WQe should be very (extremely!) carefull with this. Playing with
non-sanitised kernel headers is really dangerous, and can come bite you
at the most eunexpected moment.

> However it has been reported and verified that this package doesn't build using recent toolchain such as CodeSourcery 2013.11.

Care to share a defconfig with which I can reproduce the issue, please?
I would like to see if there is not another solution to using -I and
keep -idirafter if possible.

> It seems to come from the fact that the kernel headers in the toolchain have been updated which brings some incompatibility.

Hmmmm.. I seem to recall with had another such issue reported about CS
toolchains a while ago... Can't find it again, however... :-/

> Using -idirafter, the v4l header picked up is from the toolchain which is missing some older structures like v4l2_dbg_chip_ident.

This was removed between 3.10 and 3.11, indeed.

I think the best fix would be something like:

    diff --git a/package/gstreamer/gst-fsl-plugins/Config.in b/package/gstreamer/gst-fsl-plugins/Config.in
    index 309e745..e0d961a 100644
    --- a/package/gstreamer/gst-fsl-plugins/Config.in
    +++ b/package/gstreamer/gst-fsl-plugins/Config.in
    @@ -1,7 +1,7 @@
     comment "gst-fsl-plugins needs an imx-specific Linux kernel to be built"
            depends on BR2_arm && !BR2_LINUX_KERNEL

    -comment "gst-fsl-plugins needs an (e)glibc toolchain"
    +comment "gst-fsl-plugins needs an (e)glibc toolchain w/ headers < 3.11"
            depends on BR2_arm
            depends on !BR2_TOOLCHAIN_USES_GLIBC

    @@ -10,6 +10,7 @@ config BR2_PACKAGE_GST_FSL_PLUGINS
            depends on BR2_LINUX_KERNEL
            depends on BR2_arm # Only relevant for i.MX
            depends on BR2_TOOLCHAIN_USES_GLIBC # libfslcodec
    +       depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_11 # Old v4l2 API
            select BR2_PACKAGE_GST_PLUGINS_BASE
            select BR2_PACKAGE_LIBFSLVPUWRAP
            select BR2_PACKAGE_IMX_LIB

After all, the minimum kernel headers version can be used backward, too.
That would need confirmation by others, though...

Regards,
Yann E. MORIN,

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