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Re: [PATCH RFC server 01/11] vfio-user: build library


From: John Levon
Subject: Re: [PATCH RFC server 01/11] vfio-user: build library
Date: Mon, 19 Jul 2021 20:24:10 +0000

On Mon, Jul 19, 2021 at 04:00:03PM -0400, Jagannathan Raman wrote:

> add the libvfio-user library as a submodule. build it as part of QEMU
> 
> diff --git a/meson.build b/meson.build
> index 6e4d2d8..f2f9f86 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1894,6 +1894,41 @@ if get_option('cfi') and slirp_opt == 'system'
>           + ' Please configure with --enable-slirp=git')
>  endif
>  
> +vfiouser = not_found
> +if have_system and multiprocess_allowed
> +  have_internal = fs.exists(meson.current_source_dir() / 
> 'libvfio-user/Makefile')
> +
> +  if not have_internal
> +    error('libvfio-user source not found - please pull git submodule')
> +  endif
> +
> +  vfiouser_files = [
> +    'libvfio-user/lib/dma.c',
> +    'libvfio-user/lib/irq.c',
> +    'libvfio-user/lib/libvfio-user.c',
> +    'libvfio-user/lib/migration.c',
> +    'libvfio-user/lib/pci.c',
> +    'libvfio-user/lib/pci_caps.c',
> +    'libvfio-user/lib/tran_sock.c',
> +  ]
> +
> +  vfiouser_inc = include_directories('libvfio-user/include', 
> 'libvfio-user/lib')
> +
> +  json_c = dependency('json-c', required: false)
> +  if not json_c.found()
> +    json_c = dependency('libjson-c')
> +  endif
> +
> +  libvfiouser = static_library('vfiouser',
> +                               build_by_default: false,
> +                               sources: vfiouser_files,
> +                               dependencies: json_c,
> +                               include_directories: vfiouser_inc)
> +
> +  vfiouser = declare_dependency(link_with: libvfiouser,
> +                                include_directories: vfiouser_inc)
> +endif

Why this way, rather than recursing into the submodule? Seems a bit fragile to
encode details of the library here.

regards
john


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