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Subject: Re: [FFmpeg-devel] [PATCH v3] libx264: Set min build version to 158
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Matt Oliver:
> From: Matt Oliver <protogonoi@gmail.com>
> 
> Was "[PATCH] libx264: Do not explicitly set X264_API_IMPORTS"
> 
> Setting X264_API_IMPORTS only affects msvc builds and it breaks
> linking to static builds (although is required for shared builds).
> This flag is set by x264 in its pkgconfig as required since build
> 158 (a615f027ed172e2dd5380e736d487aa858a0c4ff) from July 2019.
> So this patch updates configure to require a newer x264 build that
> correctly sets the imports flag.
> 
> The requirement for 158 is applied for msvc builds only,
> no change is made for all other cases.
> 
> Co-authored-by: softworkz <softworkz@hotmail.com>
> Signed-off-by: softworkz <softworkz@hotmail.com>
> Signed-off-by: Matt Oliver <protogonoi@gmail.com>
> ---
>     libx264: Set min build version to 158
>     
>     I'm submitting this patch on behalf of Matt with his permission.
>     
>     There was agreement that the >= 158 version requirement should be
>     applied to MSVC builds only.
>     
>     v2: restrict the version requirement to msvc builds
>     v3: fix unintended author change
> 
> Published-As: https://github.com/ffstaging/FFmpeg/releases/tag/pr-ffstaging-30%2Fsoftworkz%2Fsubmit_x264_api_imports_matt-v3
> Fetch-It-Via: git fetch https://github.com/ffstaging/FFmpeg pr-ffstaging-30/softworkz/submit_x264_api_imports_matt-v3
> Pull-Request: https://github.com/ffstaging/FFmpeg/pull/30
> 
> Range-diff vs v2:
> 
>  1:  1696684de3 ! 1:  374130a09e libx264: Set min build version to 158
>      @@
>        ## Metadata ##
>      -Author: softworkz <softworkz@hotmail.com>
>      +Author: Matt Oliver <protogonoi@gmail.com>
>       
>        ## Commit message ##
>           libx264: Set min build version to 158
> 
> 
>  configure            | 8 +++-----
>  libavcodec/libx264.c | 4 ----
>  2 files changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/configure b/configure
> index f115b21064..9de9b7763a 100755
> --- a/configure
> +++ b/configure
> @@ -6656,11 +6656,9 @@ enabled libvpx            && {
>  enabled libwebp           && {
>      enabled libwebp_encoder      && require_pkg_config libwebp "libwebp >= 0.2.0" webp/encode.h WebPGetEncoderVersion
>      enabled libwebp_anim_encoder && check_pkg_config libwebp_anim_encoder "libwebpmux >= 0.4.0" webp/mux.h WebPAnimEncoderOptionsInit; }
> -enabled libx264           && { check_pkg_config libx264 x264 "stdint.h x264.h" x264_encoder_encode ||
> -                               { require libx264 "stdint.h x264.h" x264_encoder_encode "-lx264 $pthreads_extralibs $libm_extralibs" &&
> -                                 warn "using libx264 without pkg-config"; } } &&
> -                             require_cpp_condition libx264 x264.h "X264_BUILD >= 118" &&
> -                             check_cpp_condition libx262 x264.h "X264_MPEG2"
> +enabled libx264           && check_pkg_config libx264 x264 "stdint.h x264.h" x264_encoder_encode &&
> +                             require_cpp_condition libx264 x264.h "X264_BUILD >= 158" ||
> +                             { "$toolchain" != msvc && require_cpp_condition libx264 x264.h "X264_BUILD >= 118"; }

IIRC this is equivalent to

{ enabled libx264           && check_pkg_config libx264 x264 "stdint.h
x264.h" x264_encoder_encode &&
                             require_cpp_condition libx264 x264.h
"X264_BUILD >= 158" } ||
                             { "$toolchain" != msvc &&
require_cpp_condition libx264 x264.h "X264_BUILD >= 118"; }

which is not whan you want as the ""$toolchain" != msvc &&
require_cpp_condition libx264 x264.h "X264_BUILD >= 118";" is executed
even if libx264 is not even enabled.

>  enabled libx265           && require_pkg_config libx265 x265 x265.h x265_api_get &&
>                               require_cpp_condition libx265 x265.h "X265_BUILD >= 70"
>  enabled libxavs           && require libxavs "stdint.h xavs.h" xavs_encoder_encode "-lxavs $pthreads_extralibs $libm_extralibs"
> diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
> index 4ce3791ae8..14177b3016 100644
> --- a/libavcodec/libx264.c
> +++ b/libavcodec/libx264.c
> @@ -37,10 +37,6 @@
>  #include "atsc_a53.h"
>  #include "sei.h"
>  
> -#if defined(_MSC_VER)
> -#define X264_API_IMPORTS 1
> -#endif
> -
>  #include <x264.h>
>  #include <float.h>
>  #include <math.h>
> 
> base-commit: b033913d1c5998a29dfd13e9906dd707ff6eff12

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