[PATCH] libcamera: meson: Fix libyuv detection

[Kieran Bingham]

Quoting Kieran Bingham (2025-01-14 21:19:35)
> From: Dylan Aïssi <daissi at debian.org>
> 
> We already fall back to a subproject to support the libyuv package when
> it can not be discovered through the usual dependency() mechanism.
> 
> Unfortunately libyuv may be packaged without any corresponding
> pkg-config support as can be seen at [0], so further extend the
> dependency search by using an explicit cc.find_library() call.
> 
> [0] https://packages.debian.org/bookworm/amd64/libyuv-dev/filelist
> 
> Signed-off-by: Dylan Aïssi <dylan.aissi at collabora.com>

I've posted this patch on Dylan's behalf from
https://salsa.debian.org/multimedia-team/libcamera/-/commit/685482827a0e6fe5dfe19778e633ab95b703cef4
though I have reworded the commit message and comment inline, but the
core functional change is direct from Dylan's patch...


On Ubuntu 22.04.5 LTS:

$ sudo apt install libyuv-dev

...
libcamera$ meson setup ...
...
Found pkg-config: YES (/usr/bin/pkg-config) 0.29.2
Found CMake: /usr/bin/cmake (3.22.1)
Run-time dependency libyuv found: NO (tried pkgconfig and cmake)
Library yuv found: YES
Library atomic found: YES
...

(Based on the second Library yuv found: YES)

Tested-by: Kieran Bingham <kieran.bingham at ideasonboard.com>

> Signed-off-by: Kieran Bingham <kieran.bingham at ideasonboard.com>
> ---
>  src/meson.build | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/src/meson.build b/src/meson.build
> index 76198e9535db..0a9cdff8e7dc 100644
> --- a/src/meson.build
> +++ b/src/meson.build
> @@ -27,10 +27,15 @@ else
>      ipa_sign_module = false
>  endif
>  
> -# libyuv, used by the Android adaptation layer and the virtual pipeline handler.
> -# Fallback to a subproject if libyuv isn't found, as it's typically not provided
> -# by distributions.
> +# libyuv, used by the Android adaptation layer and the virtual pipeline
> +# handler. Fallback to a subproject if libyuv isn't found, as it's typically
> +# not provided by distributions. Where libyuv is provided by a distribution, it
> +# may not always supply a pkg-config implementation, requiring cc.find_library()
> +# to search for it.
>  libyuv_dep = dependency('libyuv', required : false)
> +if not libyuv_dep.found()
> +    libyuv_dep = cc.find_library('yuv', required: false)
> +endif
>  
>  if (pipelines.contains('virtual') or get_option('android').allowed()) and \
>     not libyuv_dep.found()
> -- 
> 2.47.1
>