[Mesa-dev] [PATCH 2/3] meson: Use the same version for all libdrm checks

[Emil Velikov]

On 13 March 2018 at 18:52, Dylan Baker <dylan at pnwbakers.com> wrote:
> Currently each driver specifies it's own version, and core libdrm
> specifies a version. In the most common case this is fine, since there
> will be exactly one libdrm installed on a system, but if there are more
> than one it's possible that mesa will be linked against different
> versions of libdrm. There is also the possibility that the current
> approach makes the pkg-config files we generate incorrect, since there
> could be #defines that use newer features if they're available.
>
> This patch corrects all of that. All of the versions are still set by
> driver (along with a default core version). Then all of the drivers that
> are enabled have their versions compared and the highest version is
> selected, then all libdrm checks are made with that version.
>
> Signed-off-by: Dylan Baker <dylan.c.baker at intel.com>
> ---
>  meson.build | 67 +++++++++++++++++++++++++++++++++++++-----------------
>  1 file changed, 46 insertions(+), 21 deletions(-)
>
> diff --git a/meson.build b/meson.build
> index e747d99..6019008 100644
> --- a/meson.build
> +++ b/meson.build
> @@ -1015,35 +1015,60 @@ dep_expat = dependency('expat')
>  # its not linux and and wont
>  dep_m = cc.find_library('m', required : false)
>
> +# Check for libdrm. various drivers have different libdrm version requirements,
> +# but we always want to use the same version for all libdrm modules. That means
> +# even if driver foo requires 2.4.0 and driver bar requires 2.4.3, if foo and
> +# bar are both on use 2.4.3 for both of them
>  dep_libdrm_amdgpu = []
>  dep_libdrm_radeon = []
>  dep_libdrm_nouveau = []
>  dep_libdrm_etnaviv = []
>  dep_libdrm_freedreno = []
>  dep_libdrm_intel = []
> -if with_dri_i915 or with_gallium_i915
> -  dep_libdrm_intel = dependency('libdrm_intel', version : '>= 2.4.75')
> -endif
> -if with_amd_vk or with_gallium_radeonsi
> -  dep_libdrm_amdgpu = dependency('libdrm_amdgpu', version : '>= 2.4.90')
> -endif
> -if (with_gallium_radeonsi or with_dri_r100 or with_dri_r200 or
> -    with_gallium_r300 or with_gallium_r600)
> -  dep_libdrm_radeon = dependency('libdrm_radeon', version : '>= 2.4.71')
> -endif
> -if with_gallium_nouveau or with_dri_nouveau
> -  dep_libdrm_nouveau = dependency('libdrm_nouveau', version : '>= 2.4.66')
> -endif
> -if with_gallium_etnaviv
> -  dep_libdrm_etnaviv = dependency('libdrm_etnaviv', version : '>= 2.4.82')
> -endif
> -if with_gallium_freedreno
> -  dep_libdrm_freedreno = dependency('libdrm_freedreno', version : '>= 2.4.91')
> -endif
> +
> +_drm_amdgpu_ver = '2.4.90'
> +_drm_radeon_ver = '2.4.71'
> +_drm_nouveau_ver = '2.4.66'
> +_drm_etnaviv_ver = '2.4.82'
> +_drm_freedreno_ver = '2.4.91'
> +_drm_intel_ver = '2.4.75'
> +_drm_ver = '2.4.75'
> +
> +_libdrm_checks = [
> +  [with_dri_i915 or with_gallium_i915, 'intel'],
> +  [with_amd_vk or with_gallium_radeonsi, 'amdgpu'],
> +  [(with_gallium_radeonsi or with_dri_r100 or with_dri_r200 or
> +   with_gallium_r300 or with_gallium_r600),
> +   'radeon'],
> +  [(with_gallium_nouveau or with_dri_nouveau), 'nouveau'],
> +  [with_gallium_etnaviv, 'etnaviv'],
> +  [with_gallium_freedreno, 'freedreno'],
> +]
> +
> +# Loop over the enables versions and get the highest libdrm requirement for all
> +# active drivers.
> +foreach d : _libdrm_checks
> +  ver = get_variable('_drm_ at 0@_ver'.format(d[1]))
> +  if d[0] and ver.version_compare('>' + _drm_ver)
> +    _drm_ver = ver
> +  endif
> +endforeach
> +
> +# Then get each libdrm module
> +foreach d : _libdrm_checks
> +  if d[0]
> +    set_variable(
> +      'dep_libdrm_' + d[1],
> +      dependency('libdrm_' + d[1], version : '>=' + _drm_ver)
> +    )
> +  endif
> +endforeach
>
>  with_gallium_drisw_kms = false
> -dep_libdrm = dependency('libdrm', version : '>= 2.4.75',
> -                        required : with_dri2 or with_dri3)
> +dep_libdrm = dependency(
> +  'libdrm', version : '>=' + _drm_ver,
> +  required : with_dri2 or with_dri3
> +)
>  if dep_libdrm.found()
>    pre_args += '-DHAVE_LIBDRM'
>    if with_dri_platform == 'drm' and with_dri

IIRC a few developers had some suggestions about this in the past, I
think Dave and Ilia were mostly interested.
Namely - both libdrm and libdrm_$vendor should meet the
$vendor_version requirement.

I'd give it a quick check with them, since I don't know the specifics
on their setups.

-Emil