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#!/bin/sh
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##
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##  configure
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##
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##  This script is the front-end to the build system. It provides a similar
##  interface to standard configure scripts with some extra bits for dealing
##  with toolchains that differ from the standard POSIX interface and
##  for extracting subsets of the source tree. In theory, reusable parts
##  of this script were intended to live in build/make/configure.sh,
##  but in practice, the line is pretty blurry.
##
##  This build system is based in part on the FFmpeg configure script.
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##

#source_path="`dirname \"$0\"`"
source_path=${0%/*}
. "${source_path}/build/make/configure.sh"

show_help(){
    show_help_pre
    cat << EOF
Advanced options:
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  ${toggle_libs}                  libraries
  ${toggle_examples}              examples
  ${toggle_docs}                  documentation
  ${toggle_unit_tests}            unit tests
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  ${toggle_decode_perf_tests}     build decoder perf tests with unit tests
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  ${toggle_encode_perf_tests}     build encoder perf tests with unit tests
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  --cpu=CPU                       tune for the specified CPU (ARM: cortex-a8, X86: sse3)
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  --libc=PATH                     path to alternate libc
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  --size-limit=WxH                max size to allow in the decoder
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  --as={yasm|nasm|auto}           use specified assembler [auto, yasm preferred]
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  --sdk-path=PATH                 path to root of sdk (android builds only)
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  ${toggle_codec_srcs}            in/exclude codec library source code
  ${toggle_debug_libs}            in/exclude debug version of libraries
  ${toggle_static_msvcrt}         use static MSVCRT (VS builds only)
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  ${toggle_vp9_highbitdepth}      use VP9 high bit depth (10/12) profiles
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  ${toggle_vp8}                   VP8 codec support
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  ${toggle_vp9}                   VP9 codec support
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  ${toggle_internal_stats}        output of encoder internal stats for debug, if supported (encoders)
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  ${toggle_postproc}              postprocessing
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  ${toggle_vp9_postproc}          vp9 specific postprocessing
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  ${toggle_multithread}           multithreaded encoding and decoding
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  ${toggle_spatial_resampling}    spatial sampling (scaling) support
  ${toggle_realtime_only}         enable this option while building for real-time encoding
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  ${toggle_onthefly_bitpacking}   enable on-the-fly bitpacking in real-time encoding
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  ${toggle_error_concealment}     enable this option to get a decoder which is able to conceal losses
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  ${toggle_coefficient_range_checking}
                                  enable decoder to check if intermediate
                                  transform coefficients are in valid range
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  ${toggle_runtime_cpu_detect}    runtime cpu detection
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  ${toggle_shared}                shared library support
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  ${toggle_static}                static library support
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  ${toggle_small}                 favor smaller size over speed
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  ${toggle_postproc_visualizer}   macro block / block level visualizers
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  ${toggle_multi_res_encoding}    enable multiple-resolution encoding
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  ${toggle_temporal_denoising}    enable temporal denoising and disable the spatial denoiser
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  ${toggle_vp9_temporal_denoising}
                                  enable vp9 temporal denoising
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  ${toggle_webm_io}               enable input from and output to WebM container
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  ${toggle_libyuv}                enable libyuv
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Codecs:
  Codecs can be selectively enabled or disabled individually, or by family:
      --disable-<codec>
  is equivalent to:
      --disable-<codec>-encoder
      --disable-<codec>-decoder

  Codecs available in this distribution:
EOF
#restore editor state '

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    family="";
    last_family="";
    c="";
    str="";
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    for c in ${CODECS}; do
        family=${c%_*}
        if [ "${family}" != "${last_family}" ]; then
            [ -z "${str}" ] || echo "${str}"
            str="$(printf '    %10s:' ${family})"
        fi
        str="${str} $(printf '%10s' ${c#*_})"
        last_family=${family}
    done
    echo "${str}"
    show_help_post
}

##
## BEGIN APPLICATION SPECIFIC CONFIGURATION
##

# all_platforms is a list of all supported target platforms. Maintain
# alphabetically by architecture, generic-gnu last.
all_platforms="${all_platforms} armv6-darwin-gcc"
all_platforms="${all_platforms} armv6-linux-rvct"
all_platforms="${all_platforms} armv6-linux-gcc"
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all_platforms="${all_platforms} armv6-none-rvct"
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all_platforms="${all_platforms} arm64-darwin-gcc"
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all_platforms="${all_platforms} armv7-android-gcc"   #neon Cortex-A8
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all_platforms="${all_platforms} armv7-darwin-gcc"    #neon Cortex-A8
all_platforms="${all_platforms} armv7-linux-rvct"    #neon Cortex-A8
all_platforms="${all_platforms} armv7-linux-gcc"     #neon Cortex-A8
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all_platforms="${all_platforms} armv7-none-rvct"     #neon Cortex-A8
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all_platforms="${all_platforms} armv7-win32-vs11"
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all_platforms="${all_platforms} armv7-win32-vs12"
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all_platforms="${all_platforms} armv7s-darwin-gcc"
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all_platforms="${all_platforms} mips32-linux-gcc"
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all_platforms="${all_platforms} mips64-linux-gcc"
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all_platforms="${all_platforms} sparc-solaris-gcc"
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all_platforms="${all_platforms} x86-android-gcc"
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all_platforms="${all_platforms} x86-darwin8-gcc"
all_platforms="${all_platforms} x86-darwin8-icc"
all_platforms="${all_platforms} x86-darwin9-gcc"
all_platforms="${all_platforms} x86-darwin9-icc"
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all_platforms="${all_platforms} x86-darwin10-gcc"
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all_platforms="${all_platforms} x86-darwin11-gcc"
all_platforms="${all_platforms} x86-darwin12-gcc"
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all_platforms="${all_platforms} x86-darwin13-gcc"
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all_platforms="${all_platforms} x86-darwin14-gcc"
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all_platforms="${all_platforms} x86-iphonesimulator-gcc"
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all_platforms="${all_platforms} x86-linux-gcc"
all_platforms="${all_platforms} x86-linux-icc"
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all_platforms="${all_platforms} x86-os2-gcc"
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all_platforms="${all_platforms} x86-solaris-gcc"
all_platforms="${all_platforms} x86-win32-gcc"
all_platforms="${all_platforms} x86-win32-vs7"
all_platforms="${all_platforms} x86-win32-vs8"
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all_platforms="${all_platforms} x86-win32-vs9"
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all_platforms="${all_platforms} x86-win32-vs10"
all_platforms="${all_platforms} x86-win32-vs11"
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all_platforms="${all_platforms} x86-win32-vs12"
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all_platforms="${all_platforms} x86_64-darwin9-gcc"
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all_platforms="${all_platforms} x86_64-darwin10-gcc"
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all_platforms="${all_platforms} x86_64-darwin11-gcc"
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all_platforms="${all_platforms} x86_64-darwin12-gcc"
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all_platforms="${all_platforms} x86_64-darwin13-gcc"
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all_platforms="${all_platforms} x86_64-darwin14-gcc"
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all_platforms="${all_platforms} x86_64-iphonesimulator-gcc"
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all_platforms="${all_platforms} x86_64-linux-gcc"
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all_platforms="${all_platforms} x86_64-linux-icc"
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all_platforms="${all_platforms} x86_64-solaris-gcc"
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all_platforms="${all_platforms} x86_64-win64-gcc"
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all_platforms="${all_platforms} x86_64-win64-vs8"
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all_platforms="${all_platforms} x86_64-win64-vs9"
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all_platforms="${all_platforms} x86_64-win64-vs10"
all_platforms="${all_platforms} x86_64-win64-vs11"
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all_platforms="${all_platforms} x86_64-win64-vs12"
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all_platforms="${all_platforms} universal-darwin8-gcc"
all_platforms="${all_platforms} universal-darwin9-gcc"
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all_platforms="${all_platforms} universal-darwin10-gcc"
all_platforms="${all_platforms} universal-darwin11-gcc"
all_platforms="${all_platforms} universal-darwin12-gcc"
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all_platforms="${all_platforms} universal-darwin13-gcc"
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all_platforms="${all_platforms} universal-darwin14-gcc"
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all_platforms="${all_platforms} generic-gnu"

# all_targets is a list of all targets that can be configured
# note that these should be in dependency order for now.
all_targets="libs examples docs"

# all targets available are enabled, by default.
for t in ${all_targets}; do
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    [ -f "${source_path}/${t}.mk" ] && enable_feature ${t}
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done

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if ! perl --version >/dev/null; then
    die "Perl is required to build"
fi
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if [ "`cd \"${source_path}\" && pwd`" != "`pwd`" ]; then
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  # test to see if source_path already configured
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  if [ -f "${source_path}/vpx_config.h" ]; then
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    die "source directory already configured; run 'make distclean' there first"
  fi
fi

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# check installed doxygen version
doxy_version=$(doxygen --version 2>/dev/null)
doxy_major=${doxy_version%%.*}
if [ ${doxy_major:-0} -ge 1 ]; then
    doxy_version=${doxy_version#*.}
    doxy_minor=${doxy_version%%.*}
    doxy_patch=${doxy_version##*.}

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    [ $doxy_major -gt 1 ] && enable_feature doxygen
    [ $doxy_minor -gt 5 ] && enable_feature doxygen
    [ $doxy_minor -eq 5 ] && [ $doxy_patch -ge 3 ] && enable_feature doxygen
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fi

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# install everything except the sources, by default. sources will have
# to be enabled when doing dist builds, since that's no longer a common
# case.
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enabled doxygen && enable_feature install_docs
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enable_feature install_bins
enable_feature install_libs

enable_feature static
enable_feature optimizations
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enable_feature dependency_tracking
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enable_feature spatial_resampling
enable_feature multithread
enable_feature os_support
enable_feature temporal_denoising

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[ -d "${source_path}/../include" ] && enable_feature alt_tree_layout
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for d in vp8 vp9; do
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    [ -d "${source_path}/${d}" ] && disable_feature alt_tree_layout;
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done

if ! enabled alt_tree_layout; then
# development environment
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[ -d "${source_path}/vp8" ] && CODECS="${CODECS} vp8_encoder vp8_decoder"
[ -d "${source_path}/vp9" ] && CODECS="${CODECS} vp9_encoder vp9_decoder"
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else
# customer environment
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[ -f "${source_path}/../include/vpx/vp8cx.h" ] && CODECS="${CODECS} vp8_encoder"
[ -f "${source_path}/../include/vpx/vp8dx.h" ] && CODECS="${CODECS} vp8_decoder"
[ -f "${source_path}/../include/vpx/vp9cx.h" ] && CODECS="${CODECS} vp9_encoder"
[ -f "${source_path}/../include/vpx/vp9dx.h" ] && CODECS="${CODECS} vp9_decoder"
[ -f "${source_path}/../include/vpx/vp8cx.h" ] || disable_feature vp8_encoder
[ -f "${source_path}/../include/vpx/vp8dx.h" ] || disable_feature vp8_decoder
[ -f "${source_path}/../include/vpx/vp9cx.h" ] || disable_feature vp9_encoder
[ -f "${source_path}/../include/vpx/vp9dx.h" ] || disable_feature vp9_decoder

[ -f "${source_path}/../lib/*/*mt.lib" ] && soft_enable static_msvcrt
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fi

CODECS="$(echo ${CODECS} | tr ' ' '\n')"
CODEC_FAMILIES="$(for c in ${CODECS}; do echo ${c%_*}; done | sort | uniq)"

ARCH_LIST="
    arm
    mips
    x86
    x86_64
"
ARCH_EXT_LIST="
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    edsp
    media
    neon
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    neon_asm
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    mips32
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    dspr2
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    msa
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    mips64

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    mmx
    sse
    sse2
    sse3
    ssse3
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    sse4_1
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    avx
    avx2
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"
HAVE_LIST="
    ${ARCH_EXT_LIST}
    vpx_ports
    stdint_h
    alt_tree_layout
    pthread_h
    sys_mman_h
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    unistd_h
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"
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EXPERIMENT_LIST="
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    spatial_svc
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    fp_mb_stats
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    emulate_hardware
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"
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CONFIG_LIST="
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    dependency_tracking
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    external_build
    install_docs
    install_bins
    install_libs
    install_srcs
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    use_x86inc
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    debug
    gprof
    gcov
    rvct
    gcc
    msvs
    pic
    big_endian

    codec_srcs
    debug_libs

    dequant_tokens
    dc_recon
    runtime_cpu_detect
    postproc
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    vp9_postproc
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    multithread
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    internal_stats
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    ${CODECS}
    ${CODEC_FAMILIES}
    encoders
    decoders
    static_msvcrt
    spatial_resampling
    realtime_only
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    onthefly_bitpacking
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    error_concealment
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    shared
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    static
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    small
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    postproc_visualizer
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    os_support
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    unit_tests
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    webm_io
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    libyuv
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    decode_perf_tests
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    encode_perf_tests
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    multi_res_encoding
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    temporal_denoising
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    vp9_temporal_denoising
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    coefficient_range_checking
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    vp9_highbitdepth
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    experimental
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    size_limit
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    ${EXPERIMENT_LIST}
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"
CMDLINE_SELECT="
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    dependency_tracking
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    external_build
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    extra_warnings
    werror
    install_docs
    install_bins
    install_libs
    install_srcs
    debug
    gprof
    gcov
    pic
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    use_x86inc
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    optimizations
    ccache
    runtime_cpu_detect
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    thumb
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    libs
    examples
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    docs
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    libc
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    as
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    size_limit
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    codec_srcs
    debug_libs

    dequant_tokens
    dc_recon
    postproc
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    vp9_postproc
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    multithread
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    internal_stats
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    ${CODECS}
    ${CODEC_FAMILIES}
    static_msvcrt
    spatial_resampling
    realtime_only
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    onthefly_bitpacking
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    error_concealment
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    shared
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    static
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    small
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    postproc_visualizer
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    unit_tests
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    webm_io
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    libyuv
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    decode_perf_tests
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    encode_perf_tests
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    multi_res_encoding
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    temporal_denoising
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    vp9_temporal_denoising
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    coefficient_range_checking
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    vp9_highbitdepth
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    experimental
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"

process_cmdline() {
    for opt do
        optval="${opt#*=}"
        case "$opt" in
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        --disable-codecs) for c in ${CODECS}; do disable_feature $c; done ;;
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        --enable-?*|--disable-?*)
        eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
        if echo "${EXPERIMENT_LIST}" | grep "^ *$option\$" >/dev/null; then
            if enabled experimental; then
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                ${action}_feature $option
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            else
                log_echo "Ignoring $opt -- not in experimental mode."
            fi
        else
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            process_common_cmdline $opt
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        fi
        ;;
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        *) process_common_cmdline "$opt"
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        ;;
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        esac
    done
}

post_process_cmdline() {
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    c=""
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    # If the codec family is disabled, disable all components of that family.
    # If the codec family is enabled, enable all components of that family.
    log_echo "Configuring selected codecs"
    for c in ${CODECS}; do
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        disabled ${c%%_*} && disable_feature ${c}
        enabled ${c%%_*} && enable_feature ${c}
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    done

    # Enable all detected codecs, if they haven't been disabled
    for c in ${CODECS}; do soft_enable $c; done

    # Enable the codec family if any component of that family is enabled
    for c in ${CODECS}; do
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        enabled $c && enable_feature ${c%_*}
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    done

    # Set the {en,de}coders variable if any algorithm in that class is enabled
    for c in ${CODECS}; do
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        enabled ${c} && enable_feature ${c##*_}s
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    done
}


process_targets() {
    enabled child || write_common_config_banner
    enabled universal || write_common_target_config_h  ${BUILD_PFX}vpx_config.h

    # For fat binaries, call configure recursively to configure for each
    # binary architecture to be included.
    if enabled universal; then
        # Call configure (ourselves) for each subarchitecture
        for arch in $fat_bin_archs; do
            BUILD_PFX=${arch}/ toolchain=${arch} $self --child $cmdline_args || exit $?
        done
    fi

    # The write_common_config (config.mk) logic is deferred until after the
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    # recursive calls to configure complete, because we want our universal
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    # targets to be executed last.
    write_common_config_targets
    enabled universal && echo "FAT_ARCHS=${fat_bin_archs}" >> config.mk

    # Calculate the default distribution name, based on the enabled features
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    cf=""
    DIST_DIR=vpx
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    for cf in $CODEC_FAMILIES; do
        if enabled ${cf}_encoder && enabled ${cf}_decoder; then
            DIST_DIR="${DIST_DIR}-${cf}"
        elif enabled ${cf}_encoder; then
            DIST_DIR="${DIST_DIR}-${cf}cx"
        elif enabled ${cf}_decoder; then
            DIST_DIR="${DIST_DIR}-${cf}dx"
        fi
    done
    enabled debug_libs && DIST_DIR="${DIST_DIR}-debug"
    enabled codec_srcs && DIST_DIR="${DIST_DIR}-src"
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    ! enabled postproc && ! enabled vp9_postproc && DIST_DIR="${DIST_DIR}-nopost"
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    ! enabled multithread && DIST_DIR="${DIST_DIR}-nomt"
    ! enabled install_docs && DIST_DIR="${DIST_DIR}-nodocs"
    DIST_DIR="${DIST_DIR}-${tgt_isa}-${tgt_os}"
    case "${tgt_os}" in
    win*) enabled static_msvcrt && DIST_DIR="${DIST_DIR}mt" || DIST_DIR="${DIST_DIR}md"
          DIST_DIR="${DIST_DIR}-${tgt_cc}"
          ;;
    esac
    if [ -f "${source_path}/build/make/version.sh" ]; then
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        ver=`"$source_path/build/make/version.sh" --bare "$source_path"`
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        DIST_DIR="${DIST_DIR}-${ver}"
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        VERSION_STRING=${ver}
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        ver=${ver%%-*}
        VERSION_PATCH=${ver##*.}
        ver=${ver%.*}
        VERSION_MINOR=${ver##*.}
        ver=${ver#v}
        VERSION_MAJOR=${ver%.*}
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    fi
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    enabled child || cat <<EOF >> config.mk
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PREFIX=${prefix}
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ifeq (\$(MAKECMDGOALS),dist)
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DIST_DIR?=${DIST_DIR}
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else
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DIST_DIR?=\$(DESTDIR)${prefix}
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endif
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LIBSUBDIR=${libdir##${prefix}/}
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VERSION_STRING=${VERSION_STRING}

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VERSION_MAJOR=${VERSION_MAJOR}
VERSION_MINOR=${VERSION_MINOR}
VERSION_PATCH=${VERSION_PATCH}

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CONFIGURE_ARGS=${CONFIGURE_ARGS}
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EOF
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    enabled child || echo "CONFIGURE_ARGS?=${CONFIGURE_ARGS}" >> config.mk

    #
    # Write makefiles for all enabled targets
    #
    for tgt in libs examples docs solution; do
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        tgt_fn="$tgt-$toolchain.mk"
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        if enabled $tgt; then
            echo "Creating makefiles for ${toolchain} ${tgt}"
            write_common_target_config_mk $tgt_fn ${BUILD_PFX}vpx_config.h
            #write_${tgt}_config
        fi
    done

}

process_detect() {
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    if enabled shared; then
        # Can only build shared libs on a subset of platforms. Doing this check
        # here rather than at option parse time because the target auto-detect
        # magic happens after the command line has been parsed.
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        if ! enabled linux; then
            if enabled gnu; then
                echo "--enable-shared is only supported on ELF; assuming this is OK"
            else
                die "--enable-shared only supported on ELF for now"
            fi
        fi
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    fi
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    if [ -z "$CC" ] || enabled external_build; then
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        echo "Bypassing toolchain for environment detection."
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        enable_feature external_build
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        check_header() {
            log fake_check_header "$@"
            header=$1
            shift
            var=`echo $header | sed 's/[^A-Za-z0-9_]/_/g'`
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            disable_feature $var
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            # Headers common to all environments
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            case $header in
                stdio.h)
                    true;
                ;;
                *)
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                    result=false
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                    for d in "$@"; do
                        [ -f "${d##-I}/$header" ] && result=true && break
                    done
                    ${result:-true}
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            esac && enable_feature $var
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            # Specialize windows and POSIX environments.
            case $toolchain in
                *-win*-*)
                    case $header-$toolchain in
                        stdint*-gcc) true;;
                        *) false;;
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                    esac && enable_feature $var
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                    ;;
                *)
                    case $header in
                        stdint.h) true;;
                        pthread.h) true;;
                        sys/mman.h) true;;
                        unistd.h) true;;
                        *) false;;
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                    esac && enable_feature $var
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            esac
            enabled $var
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        }
        check_ld() {
            true
        }
    fi
    check_header stdio.h || die "Unable to invoke compiler: ${CC} ${CFLAGS}"
    check_ld <<EOF || die "Toolchain is unable to link executables"
int main(void) {return 0;}
EOF
    # check system headers
    check_header stdint.h
    check_header pthread.h
    check_header sys/mman.h
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    check_header unistd.h # for sysconf(3) and friends.
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    check_header vpx/vpx_integer.h -I${source_path} && enable_feature vpx_ports
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}

process_toolchain() {
    process_common_toolchain

    # Handle universal binaries for this architecture
    case $toolchain in
        universal-darwin*)
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            darwin_ver=${tgt_os##darwin}
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            # Tiger (10.4/darwin8) brought support for x86
            if [ $darwin_ver -ge 8 ]; then
                fat_bin_archs="$fat_bin_archs x86-${tgt_os}-${tgt_cc}"
            fi

            # Leopard (10.5/darwin9) brought 64 bit support
            if [ $darwin_ver -ge 9 ]; then
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                fat_bin_archs="$fat_bin_archs x86_64-${tgt_os}-${tgt_cc}"
            fi
            ;;
    esac


    # Enable some useful compiler flags
    if enabled gcc; then
        enabled werror && check_add_cflags -Werror
        check_add_cflags -Wall
        check_add_cflags -Wdeclaration-after-statement
        check_add_cflags -Wdisabled-optimization
        check_add_cflags -Wpointer-arith
        check_add_cflags -Wtype-limits
        check_add_cflags -Wcast-qual
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        check_add_cflags -Wvla
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        check_add_cflags -Wimplicit-function-declaration
        check_add_cflags -Wuninitialized
        check_add_cflags -Wunused-variable
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        case ${CC} in
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          *clang*)
              # libvpx and/or clang have issues with aliasing:
              # https://code.google.com/p/webm/issues/detail?id=603
              # work around them until they are fixed
              check_add_cflags -fno-strict-aliasing
          ;;
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          *) check_add_cflags -Wunused-but-set-variable ;;
        esac
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        enabled extra_warnings || check_add_cflags -Wno-unused-function
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    fi

    if enabled icc; then
        enabled werror && check_add_cflags -Werror
        check_add_cflags -Wall
        check_add_cflags -Wpointer-arith

        # ICC has a number of floating point optimizations that we disable
        # in favor of deterministic output WRT to other compilers
        add_cflags -fp-model precise
    fi

    # Enable extra, harmless warnings. These might provide additional insight
    # to what the compiler is doing and why, but in general, but they shouldn't
    # be treated as fatal, even if we're treating warnings as errors.
    GCC_EXTRA_WARNINGS="
        -Wdisabled-optimization
        -Winline
    "
    enabled gcc && EXTRA_WARNINGS="${GCC_EXTRA_WARNINGS}"
    RVCT_EXTRA_WARNINGS="
        --remarks
    "
    enabled rvct && EXTRA_WARNINGS="${RVCT_EXTRA_WARNINGS}"
    if enabled extra_warnings; then
        for w in ${EXTRA_WARNINGS}; do
            check_add_cflags ${w}
            enabled gcc && enabled werror && check_add_cflags -Wno-error=${w}
        done
    fi

    # ccache only really works on gcc toolchains
    enabled gcc || soft_disable ccache
    if enabled mips; then
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        enable_feature dequant_tokens
        enable_feature dc_recon
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    fi

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    if enabled internal_stats; then
        enable_feature vp9_postproc
    fi

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    # Enable the postbuild target if building for visual studio.
    case "$tgt_cc" in
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        vs*) enable_feature msvs
             enable_feature solution
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             vs_version=${tgt_cc##vs}
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             case $vs_version in
             [789])
                 VCPROJ_SFX=vcproj
                 gen_vcproj_cmd=${source_path}/build/make/gen_msvs_proj.sh
                 ;;
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             10|11|12)
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                 VCPROJ_SFX=vcxproj
                 gen_vcproj_cmd=${source_path}/build/make/gen_msvs_vcxproj.sh
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                 enabled werror && gen_vcproj_cmd="${gen_vcproj_cmd} --enable-werror"
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                 ;;
             esac
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             all_targets="${all_targets} solution"
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             INLINE="__forceinline"
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        ;;
    esac

    # Other toolchain specific defaults
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    case $toolchain in x86*|universal*) soft_enable postproc;; esac
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    if enabled postproc_visualizer; then
        enabled postproc || die "postproc_visualizer requires postproc to be enabled"
    fi
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    # Enable unit tests by default if we have a working C++ compiler.
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    case "$toolchain" in
        *-vs*)
            soft_enable unit_tests
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            soft_enable webm_io
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            soft_enable libyuv
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        ;;
        *-android-*)
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            soft_enable webm_io
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            soft_enable libyuv
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            # GTestLog must be modified to use Android logging utilities.
        ;;
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        *-darwin-*)
            # iOS/ARM builds do not work with gtest. This does not match
            # x86 targets.
        ;;
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        *-iphonesimulator-*)
            soft_enable webm_io
            soft_enable libyuv
        ;;
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        *-win*)
            # Some mingw toolchains don't have pthread available by default.
            # Treat these more like visual studio where threading in gtest
            # would be disabled for the same reason.
            check_cxx "$@" <<EOF && soft_enable unit_tests
int z;
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EOF
            check_cxx "$@" <<EOF && soft_enable webm_io
int z;
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EOF
            check_cxx "$@" <<EOF && soft_enable libyuv
int z;
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EOF
        ;;
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        *)
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            enabled pthread_h && check_cxx "$@" <<EOF && soft_enable unit_tests
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int z;
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EOF
            check_cxx "$@" <<EOF && soft_enable webm_io
int z;
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EOF
            check_cxx "$@" <<EOF && soft_enable libyuv
int z;
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EOF
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        ;;
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    esac
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    # libwebm needs to be linked with C++ standard library
    enabled webm_io && LD=${CXX}
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}


##
## END APPLICATION SPECIFIC CONFIGURATION
##
CONFIGURE_ARGS="$@"
process "$@"
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print_webm_license ${BUILD_PFX}vpx_config.c "/*" " */"
cat <<EOF >> ${BUILD_PFX}vpx_config.c
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static const char* const cfg = "$CONFIGURE_ARGS";
const char *vpx_codec_build_config(void) {return cfg;}
EOF