configure

#!/bin/sh
#
# FFmpeg configure script
#
# Copyright (c) 2000-2002 Fabrice Bellard
# Copyright (c) 2005-2008 Diego Biurrun
# Copyright (c) 2005-2008 Mans Rullgard
#

# Prevent locale nonsense from breaking basic text processing.
LC_ALL=C
export LC_ALL

# make sure we are running under a compatible shell
# try to make this part work with most shells

try_exec(){
    echo "Trying shell $1"
    type "$1" > /dev/null 2>&1 && exec "$@"
}

unset foo
(: ${foo%%bar}) 2> /dev/null
E1="$?"

(: ${foo?}) 2> /dev/null
E2="$?"

if test "$E1" != 0 || test "$E2" = 0; then
    echo "Broken shell detected.  Trying alternatives."
    export FF_CONF_EXEC
    if test "0$FF_CONF_EXEC" -lt 1; then
        FF_CONF_EXEC=1
        try_exec bash "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 2; then
        FF_CONF_EXEC=2
        try_exec ksh "$0" "$@"
    fi
    if test "0$FF_CONF_EXEC" -lt 3; then
        FF_CONF_EXEC=3
        try_exec /usr/xpg4/bin/sh "$0" "$@"
    fi
    echo "No compatible shell script interpreter found."
    echo "This configure script requires a POSIX-compatible shell"
    echo "such as bash or ksh."
    echo "THIS IS NOT A BUG IN FFMPEG, DO NOT REPORT IT AS SUCH."
    echo "Instead, install a working POSIX-compatible shell."
    echo "Disabling this configure test will create a broken FFmpeg."
    if test "$BASH_VERSION" = '2.04.0(1)-release'; then
        echo "This bash version ($BASH_VERSION) is broken on your platform."
        echo "Upgrade to a later version if available."
    fi
    exit 1
fi

show_help(){
  echo "Usage: configure [options]"
  echo "Options: [defaults in brackets after descriptions]"
  echo
  echo "Standard options:"
  echo "  --help                   print this message"
  echo "  --logfile=FILE           log tests and output to FILE [config.err]"
  echo "  --disable-logging        do not log configure debug information"
  echo "  --prefix=PREFIX          install in PREFIX [$prefix]"
  echo "  --bindir=DIR             install binaries in DIR [PREFIX/bin]"
  echo "  --datadir=DIR            install data files in DIR [PREFIX/share/ffmpeg]"
  echo "  --libdir=DIR             install libs in DIR [PREFIX/lib]"
  echo "  --shlibdir=DIR           install shared libs in DIR [PREFIX/lib]"
  echo "  --incdir=DIR             install includes in DIR [PREFIX/include]"
  echo "  --mandir=DIR             install man page in DIR [PREFIX/share/man]"
  echo
  echo "Configuration options:"
  echo "  --disable-static         do not build static libraries [no]"
  echo "  --enable-shared          build shared libraries [no]"
  echo "  --enable-gpl             allow use of GPL code, the resulting libs"
  echo "                           and binaries will be under GPL [no]"
  echo "  --enable-version3        upgrade (L)GPL to version 3 [no]"
  echo "  --enable-nonfree         allow use of nonfree code, the resulting libs"
  echo "                           and binaries will be unredistributable [no]"
  echo "  --disable-ffmpeg         disable ffmpeg build"
  echo "  --disable-ffplay         disable ffplay build"
  echo "  --disable-ffserver       disable ffserver build"
  echo "  --enable-postproc        enable GPLed postprocessing support [no]"
  echo "  --enable-avfilter        video filter support [no]"
  echo "  --enable-avfilter-lavf   video filters dependent on avformat [no]"
  echo "  --enable-beosthreads     use BeOS threads [no]"
  echo "  --enable-os2threads      use OS/2 threads [no]"
  echo "  --enable-pthreads        use pthreads [no]"
  echo "  --enable-w32threads      use Win32 threads [no]"
  echo "  --enable-x11grab         enable X11 grabbing [no]"
  echo "  --disable-network        disable network support [no]"
  echo "  --disable-ipv6           disable IPv6 support [no]"
  echo "  --disable-mpegaudio-hp   faster (but less accurate) MPEG audio decoding [no]"
  echo "  --enable-gray            enable full grayscale support (slower color)"
  echo "  --disable-swscale-alpha  disable alpha channel support in swscale"
  echo "  --disable-fastdiv        disable table-based division"
  echo "  --enable-small           optimize for size instead of speed"
  echo "  --disable-aandct         disable AAN DCT code"
  echo "  --disable-fft            disable FFT code"
  echo "  --disable-golomb         disable Golomb code"
  echo "  --disable-mdct           disable MDCT code"
  echo "  --disable-rdft           disable RDFT code"
  echo "  --disable-vaapi          disable VAAPI code"
  echo "  --disable-vdpau          disable VDPAU code"
  echo "  --enable-runtime-cpudetect detect cpu capabilities at runtime (bigger binary)"
  echo "  --enable-hardcoded-tables use hardcoded tables instead of runtime generation"
  echo "  --enable-memalign-hack   emulate memalign, interferes with memory debuggers"
  echo "  --enable-beos-netserver  enable BeOS netserver"
  echo "  --disable-encoder=NAME   disable encoder NAME"
  echo "  --enable-encoder=NAME    enable encoder NAME"
  echo "  --disable-encoders       disable all encoders"
  echo "  --disable-decoder=NAME   disable decoder NAME"
  echo "  --enable-decoder=NAME    enable decoder NAME"
  echo "  --disable-decoders       disable all decoders"
  echo "  --disable-hwaccel=NAME   disable hwaccel NAME"
  echo "  --enable-hwaccel=NAME    enable hwaccel NAME"
  echo "  --disable-hwaccels       disable all hwaccels"
  echo "  --disable-muxer=NAME     disable muxer NAME"
  echo "  --enable-muxer=NAME      enable muxer NAME"
  echo "  --disable-muxers         disable all muxers"
  echo "  --disable-demuxer=NAME   disable demuxer NAME"
  echo "  --enable-demuxer=NAME    enable demuxer NAME"
  echo "  --disable-demuxers       disable all demuxers"
  echo "  --enable-parser=NAME     enable parser NAME"
  echo "  --disable-parser=NAME    disable parser NAME"
  echo "  --disable-parsers        disable all parsers"
  echo "  --enable-bsf=NAME        enable bitstream filter NAME"
  echo "  --disable-bsf=NAME       disable bitstream filter NAME"
  echo "  --disable-bsfs           disable all bitstream filters"
  echo "  --enable-protocol=NAME   enable protocol NAME"
  echo "  --disable-protocol=NAME  disable protocol NAME"
  echo "  --disable-protocols      disable all protocols"
  echo "  --disable-indev=NAME     disable input device NAME"
  echo "  --disable-outdev=NAME    disable output device NAME"
  echo "  --disable-indevs         disable input devices"
  echo "  --disable-outdevs        disable output devices"
  echo "  --disable-devices        disable all devices"
  echo "  --enable-filter=NAME     enable filter NAME"
  echo "  --disable-filter=NAME    disable filter NAME"
  echo "  --disable-filters        disable all filters"
  echo "  --list-decoders          show all available decoders"
  echo "  --list-encoders          show all available encoders"
  echo "  --list-hwaccels          show all available hardware accelerators"
  echo "  --list-muxers            show all available muxers"
  echo "  --list-demuxers          show all available demuxers"
  echo "  --list-parsers           show all available parsers"
  echo "  --list-protocols         show all available protocols"
  echo "  --list-bsfs              show all available bitstream filters"
  echo "  --list-indevs            show all available input devices"
  echo "  --list-outdevs           show all available output devices"
  echo "  --list-filters           show all available filters"
  echo
  echo "External library support:"
  echo "  --enable-avisynth        enable reading of AVISynth script files [no]"
  echo "  --enable-bzlib           enable bzlib [autodetect]"
  echo "  --enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]"
  echo "  --enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]"
  echo "  --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394"
  echo "                           and libraw1394 [no]"
  echo "  --enable-libdirac        enable Dirac support via libdirac [no]"
  echo "  --enable-libfaac         enable FAAC support via libfaac [no]"
  echo "  --enable-libfaad         enable FAAD support via libfaad [no]"
  echo "  --enable-libfaadbin      open libfaad.so.0 at runtime [no]"
  echo "  --enable-libgsm          enable GSM support via libgsm [no]"
  echo "  --enable-libmp3lame      enable MP3 encoding via libmp3lame [no]"
  echo "  --enable-libnut          enable NUT (de)muxing via libnut,"
  echo "                           native (de)muxer exists [no]"
  echo "  --enable-libopenjpeg     enable JPEG 2000 decoding via OpenJPEG [no]"
  echo "  --enable-libschroedinger enable Dirac support via libschroedinger [no]"
  echo "  --enable-libspeex        enable Speex decoding via libspeex [no]"
  echo "  --enable-libtheora       enable Theora encoding via libtheora [no]"
  echo "  --enable-libvorbis       enable Vorbis encoding via libvorbis,"
  echo "                           native implementation exists [no]"
  echo "  --enable-libx264         enable H.264 encoding via x264 [no]"
  echo "  --enable-libxvid         enable Xvid encoding via xvidcore,"
  echo "                           native MPEG-4/Xvid encoder exists [no]"
  echo "  --enable-mlib            enable Sun medialib [no]"
  echo "  --enable-zlib            enable zlib [autodetect]"
  echo ""
  echo "Advanced options (experts only):"
  echo "  --source-path=PATH       path to source code [$source_path]"
  echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]"
  echo "  --enable-cross-compile   assume a cross-compiler is used"
  echo "  --sysroot=PATH           root of cross-build tree"
  echo "  --sysinclude=PATH        location of cross-build system headers"
  echo "  --target-os=OS           compiler targets OS [$target_os]"
  echo "  --target-exec=CMD        command to run executables on target"
  echo "  --target-path=DIR        path to view of build directory on target"
  echo "  --nm=NM                  use nm tool"
  echo "  --as=AS                  use assembler AS [$as_default]"
  echo "  --cc=CC                  use C compiler CC [$cc_default]"
  echo "  --ld=LD                  use linker LD"
  echo "  --host-cc=HOSTCC         use host C compiler HOSTCC"
  echo "  --host-cflags=HCFLAGS    use HCFLAGS when compiling for host"
  echo "  --host-ldflags=HLDFLAGS  use HLDFLAGS when linking for host"
  echo "  --host-libs=HLIBS        use libs HLIBS when linking for host"
  echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]"
  echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]"
  echo "  --extra-libs=ELIBS       add ELIBS [$ELIBS]"
  echo "  --extra-version=STRING   version string suffix []"
  echo "  --build-suffix=SUFFIX    library name suffix []"
  echo "  --arch=ARCH              select architecture [$arch]"
  echo "  --cpu=CPU                select the minimum required CPU (affects"
  echo "                           instruction selection, may crash on older CPUs)"
  echo "  --enable-powerpc-perf    enable performance report on PPC"
  echo "                           (requires enabling PMC)"
  echo "  --disable-altivec        disable AltiVec optimizations"
  echo "  --disable-amd3dnow       disable 3DNow! optimizations"
  echo "  --disable-amd3dnowext    disable 3DNow! extended optimizations"
  echo "  --disable-mmx            disable MMX optimizations"
  echo "  --disable-mmx2           disable MMX2 optimizations"
  echo "  --disable-sse            disable SSE optimizations"
  echo "  --disable-ssse3          disable SSSE3 optimizations"
  echo "  --disable-armv5te        disable armv5te optimizations"
  echo "  --disable-armv6          disable armv6 optimizations"
  echo "  --disable-armv6t2        disable armv6t2 optimizations"
  echo "  --disable-armvfp         disable ARM VFP optimizations"
  echo "  --disable-iwmmxt         disable iwmmxt optimizations"
  echo "  --disable-mmi            disable MMI optimizations"
  echo "  --disable-neon           disable neon optimizations"
  echo "  --disable-vis            disable VIS optimizations"
  echo "  --disable-yasm           disable use of yasm assembler"
  echo "  --enable-pic             build position-independent code"
  echo
  echo "Developer options (useful when working on FFmpeg itself):"
  echo "  --disable-debug          disable debugging symbols"
  echo "  --enable-debug=LEVEL     set the debug level [$debuglevel]"
  echo "  --enable-gprof           enable profiling with gprof [$gprof]"
  echo "  --disable-optimizations  disable compiler optimizations"
  echo "  --enable-extra-warnings  enable more compiler warnings"
  echo "  --disable-stripping      disable stripping of executables and shared libraries"
  echo ""
  echo "NOTE: Object files are built at the place where configure is launched."
  exit 0
}

log(){
    echo "$@" >> $logfile
}

log_file(){
    log BEGIN $1
    pr -n -t $1 >> $logfile
    log END $1
}

echolog(){
    log "$@"
    echo "$@"
}

die(){
    echolog "$@"
    cat <<EOF

If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-user@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
EOF
    if disabled logging; then
        cat <<EOF
Rerun configure with logging enabled (do not use --disable-logging), and
include the log this produces with your report.
EOF
    else
cat <<EOF
Include the log file "$logfile" produced by configure as this will help
solving the problem.
EOF
    fi
    exit 1
}

# Avoid locale weirdness, besides we really just want to translate ASCII.
toupper(){
    echo "$@" | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
}

tolower(){
    echo "$@" | tr ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz
}

c_escape(){
    echo "$*" | sed 's/["\\]/\\\0/g'
}

sh_quote(){
    v=$(echo "$1" | sed "s/'/'\\\\''/g")
    test "$v" = "${v#*[ |&;<>()$\`\\\"\'*?\[\]#~=%]}" || v="'$v'"
    echo "$v"
}

filter(){
    pat=$1
    shift
    for v; do
        eval "case $v in $pat) echo $v ;; esac"
    done
}

set_all(){
    value=$1
    shift
    for var in $*; do
        eval $var=$value
    done
}

set_weak(){
    value=$1
    shift
    for var; do
        eval : \${$var:=$value}
    done
}

pushvar(){
    for var in $*; do
        eval level=\${${var}_level:=0}
        eval ${var}_${level}="\$$var"
        eval ${var}_level=$(($level+1))
    done
}

popvar(){
    for var in $*; do
        eval level=\${${var}_level:-0}
        test $level = 0 && continue
        eval level=$(($level-1))
        eval $var="\${${var}_${level}}"
        eval ${var}_level=$level
        eval unset ${var}_${level}
    done
}

enable(){
    set_all yes $*
}

disable(){
    set_all no $*
}

enable_weak(){
    set_weak yes $*
}

disable_weak(){
    set_weak no $*
}

enable_safe(){
    enable $(echo "$*" | sed 's/[^A-Za-z0-9_ ]/_/g')
}

disable_safe(){
    disable $(echo "$*" | sed 's/[^A-Za-z0-9_ ]/_/g')
}

do_enable_deep(){
    for var; do
        enabled $var && continue
        eval sel="\$${var}_select"
        eval sgs="\$${var}_suggest"
        pushvar var sgs
        enable_deep $sel
        popvar sgs
        enable_deep_weak $sgs
        popvar var
    done
}

enable_deep(){
    do_enable_deep $*
    enable $*
}

enable_deep_weak(){
    do_enable_deep $*
    enable_weak $*
}

enabled(){
    test "${1#!}" = "$1" && op== || op=!=
    eval test "x\$${1#!}" $op "xyes"
}

disabled(){
    test "${1#!}" = "$1" && op== || op=!=
    eval test "x\$${1#!}" $op "xno"
}

enabled_all(){
    for opt; do
        enabled $opt || return 1
    done
}

disabled_all(){
    for opt; do
        disabled $opt || return 1
    done
}

enabled_any(){
    for opt; do
        enabled $opt && return 0
    done
}

disabled_any(){
    for opt; do
        disabled $opt && return 0
    done
    return 1
}

set_default(){
    for opt; do
        eval : \${$opt:=\$${opt}_default}
    done
}

is_in(){
    value=$1
    shift
    for var in $*; do
        [ $var = $value ] && return 0
    done
    return 1
}

check_deps(){
    for cfg; do
        cfg="${cfg#!}"
        enabled ${cfg}_checking && die "Circular dependency for $cfg."
        disabled ${cfg}_checking && continue
        enable ${cfg}_checking

        eval dep_all="\$${cfg}_deps"
        eval dep_any="\$${cfg}_deps_any"
        eval dep_sel="\$${cfg}_select"
        eval dep_sgs="\$${cfg}_suggest"

        pushvar cfg dep_all dep_any dep_sel dep_sgs
        check_deps $dep_all $dep_any $dep_sel $dep_sgs
        popvar cfg dep_all dep_any dep_sel dep_sgs

        enabled_all  $dep_all || disable $cfg
        enabled_any  $dep_any || disable $cfg
        disabled_any $dep_sel && disable $cfg

        if enabled $cfg; then
            eval dep_extralibs="\$${cfg}_extralibs"
            test -n "$dep_extralibs" && add_extralibs $dep_extralibs
            enable_deep $dep_sel
            enable_deep_weak $dep_sgs
        fi

        disable ${cfg}_checking
    done
}

print_config(){
    pfx=$1
    header=$2
    makefile=$3
    shift 3
    for cfg; do
        ucname="$(toupper $cfg)"
        if enabled $cfg; then
            echo "#define ${pfx}${ucname} 1" >> $header
            echo "${pfx}${ucname}=yes" >> $makefile
        else
            echo "#define ${pfx}${ucname} 0" >> $header
        fi
    done
}

flags_saved(){
    (: ${SAVE_CFLAGS?}) 2> /dev/null
}

save_flags(){
    flags_saved && return
    SAVE_CFLAGS="$CFLAGS"
    SAVE_LDFLAGS="$LDFLAGS"
    SAVE_extralibs="$extralibs"
}

restore_flags(){
    flags_saved || return
    CFLAGS="$SAVE_CFLAGS"
    LDFLAGS="$SAVE_LDFLAGS"
    extralibs="$SAVE_extralibs"
    unset SAVE_CFLAGS
    unset SAVE_LDFLAGS
    unset SAVE_extralibs
}

temp_cflags(){
    save_flags
    CFLAGS="$CFLAGS $*"
}

temp_ldflags(){
    save_flags
    LDFLAGS="$LDFLAGS $*"
}

temp_extralibs(){
    save_flags
    extralibs="$extralibs $*"
}

append(){
    var=$1
    shift
    flags_saved && eval "SAVE_$var=\"\$SAVE_$var $*\""
    eval "$var=\"\$$var $*\""
}

add_cppflags(){
    append CPPFLAGS $($filter_cppflags "$@")
}

add_cflags(){
    append CFLAGS $($filter_cflags "$@")
}

add_asflags(){
    append ASFLAGS $($filter_asflags "$@")
}

add_ldflags(){
    append LDFLAGS "$@"
}

add_extralibs(){
    append extralibs "$@"
}

check_cmd(){
    log "$@"
    "$@" >> $logfile 2>&1
}

check_cc(){
    log check_cc "$@"
    cat > $TMPC
    log_file $TMPC
    check_cmd $cc $CPPFLAGS $CFLAGS "$@" -c -o $TMPO $TMPC
}

check_cpp(){
    log check_cpp "$@"
    cat > $TMPC
    log_file $TMPC
    check_cmd $cc $CPPFLAGS $CFLAGS "$@" -E -o $TMPO $TMPC
}

check_as(){
    log check_as "$@"
    cat > $TMPC
    log_file $TMPC
    check_cmd $as $CPPFLAGS $ASFLAGS "$@" -c -o $TMPO $TMPC
}

check_asm(){
    log check_asm "$@"
    name="$1"
    asm="$2"
    shift 2
    check_as "$@" <<EOF && enable $name || disable $name
void foo(void){ __asm__ volatile($asm); }
EOF
}

check_yasm(){
    log check_yasm "$@"
    echo "$1" > $TMPS
    log_file $TMPS
    shift 1
    check_cmd $yasmexe $YASMFLAGS "$@" -o $TMPO $TMPS
}

check_ld(){
    log check_ld "$@"
    check_cc || return
    flags=''
    libs=''
    for f; do
        test "${f}" = "${f#-l}" && flags="$flags $f" || libs="$libs $f"
    done
    check_cmd $ld $LDFLAGS $flags -o $TMPE $TMPO $extralibs $libs
}

check_cppflags(){
    log check_cppflags "$@"
    set -- $($filter_cppflags "$@")
    check_cc "$@" <<EOF && append CPPFLAGS "$@"
int x;
EOF
}

check_cflags(){
    log check_cflags "$@"
    set -- $($filter_cflags "$@")
    check_cc "$@" <<EOF && append CFLAGS "$@"
int x;
EOF
}

check_ldflags(){
    log check_ldflags "$@"
    check_ld "$@" <<EOF && add_ldflags "$@"
int main(void){ return 0; }
EOF
}

check_header(){
    log check_header "$@"
    header=$1
    shift
    disable_safe $header
    check_cpp "$@" <<EOF && enable_safe $header
#include <$header>
int x;
EOF
}

check_func(){
    log check_func "$@"
    func=$1
    shift
    disable $func
    check_ld "$@" <<EOF && enable $func
extern int $func();
int main(void){ $func(); }
EOF
}

check_func_headers(){
    log check_func_headers "$@"
    headers=$1
    func=$2
    shift 2
    disable $func
    incs=""
    for hdr in $headers; do
        incs="$incs
#include <$hdr>"
    done
    check_ld "$@" <<EOF && enable $func && enable_safe $headers
$incs
int main(int argc, char **argv){
    return (long) $func;
}
EOF
}

check_cpp_condition(){
    log check_cpp_condition "$@"
    header=$1
    condition=$2
    check_cpp <<EOF
#include <$header>
#if !($condition)
#error "unsatisfied condition: $condition"
#endif
EOF
}

check_lib(){
    log check_lib "$@"
    header="$1"
    func="$2"
    shift 2
    temp_extralibs "$@"
    check_header $header && check_func $func && add_extralibs "$@"
    err=$?
    restore_flags
    return $err
}

check_lib2(){
    log check_lib2 "$@"
    headers="$1"
    func="$2"
    shift 2
    temp_extralibs "$@"
    check_func_headers "$headers" $func && add_extralibs "$@"
    err=$?
    restore_flags
    return $err
}

check_exec(){
    check_ld "$@" && { enabled cross_compile || $TMPE >> $logfile 2>&1; }
}

check_exec_crash(){
    code=$(cat)

    # exit() is not async signal safe.  _Exit (C99) and _exit (POSIX)
    # are safe but may not be available everywhere.  Thus we use
    # raise(SIGTERM) instead.  The check is run in a subshell so we
    # can redirect the "Terminated" message from the shell.  SIGBUS
    # is not defined by standard C so it is used conditionally.

    (check_exec "$@") >> $logfile 2>&1 <<EOF
#include <signal.h>
static void sighandler(int sig){
    raise(SIGTERM);
}
int main(void){
    signal(SIGILL, sighandler);
    signal(SIGFPE, sighandler);
    signal(SIGSEGV, sighandler);
#ifdef SIGBUS
    signal(SIGBUS, sighandler);
#endif
    { $code }
}
EOF
}

check_type(){
    log check_type "$@"
    headers=$1
    type=$2
    shift 2
    disable $type
    incs=""
    for hdr in $headers; do
        incs="$incs
#include <$hdr>"
    done
    check_cc "$@" <<EOF && enable $type
$incs
$type v;
EOF
}

require(){
    name="$1"
    header="$2"
    func="$3"
    shift 3
    check_lib $header $func "$@" || die "ERROR: $name not found"
}

require2(){
    name="$1"
    headers="$2"
    func="$3"
    shift 3
    check_lib2 "$headers" $func "$@" || die "ERROR: $name not found"
}

check_foo_config(){
    cfg=$1
    pkg=$2
    header=$3
    func=$4
    shift 4
    disable $cfg
    check_cmd ${pkg}-config --version
    err=$?
    if test "$err" = 0; then
        temp_cflags $(${pkg}-config --cflags)
        temp_extralibs $(${pkg}-config --libs)
        check_lib "$@" $header $func && enable $cfg
    fi
    return $err
}

apply(){
    file=$1
    shift
    "$@" < "$file" > "$file.tmp" && mv "$file.tmp" "$file" || rm "$file.tmp"
}

# CONFIG_LIST contains configurable options, while HAVE_LIST is for
# system-dependent things.

COMPONENT_LIST="
    bsfs
    decoders
    demuxers
    encoders
    filters
    hwaccels
    indevs
    muxers
    outdevs
    parsers
    protocols
"

CONFIG_LIST="
    $COMPONENT_LIST
    aandct
    avfilter
    avfilter_lavf
    avisynth
    beos_netserver
    bzlib
    fastdiv
    ffmpeg
    ffplay
    ffserver
    fft
    golomb
    gpl
    gprof
    gray
    hardcoded_tables
    ipv6
    libdc1394
    libdirac
    libfaac
    libfaad
    libfaadbin
    libgsm
    libmp3lame
    libnut
    libopencore_amrnb
    libopencore_amrwb
    libopenjpeg
    libschroedinger
    libspeex
    libtheora
    libvorbis
    libx264
    libxvid
    mdct
    memalign_hack
    mlib
    mpegaudio_hp
    network
    nonfree
    pic
    postproc
    powerpc_perf
    rdft
    runtime_cpudetect
    shared
    small
    static
    swscale_alpha
    vaapi
    vdpau
    version3
    x11grab
    zlib
"

THREADS_LIST='
    beosthreads
    os2threads
    pthreads
    w32threads
'

ARCH_LIST='
    alpha
    arm
    avr32
    avr32_ap
    avr32_uc
    bfin
    ia64
    m68k
    mips
    mips64
    parisc
    ppc
    ppc64
    s390
    sh4
    sparc
    sparc64
    x86
    x86_32
    x86_64
'

ARCH_EXT_LIST='
    altivec
    amd3dnow
    amd3dnowext
    armv5te
    armv6
    armv6t2
    armvfp
    iwmmxt
    mmi
    mmx
    mmx2
    neon
    ppc4xx
    sse
    ssse3
    vis
'

HAVE_LIST="
    $ARCH_EXT_LIST
    $THREADS_LIST
    alsa_asoundlib_h
    altivec_h
    arpa_inet_h
    attribute_packed
    bigendian
    bswap
    closesocket
    cmov
    conio_h
    dcbzl
    dev_bktr_ioctl_bt848_h
    dev_bktr_ioctl_meteor_h
    dev_ic_bt8xx_h
    dev_video_meteor_ioctl_meteor_h
    dev_video_bktr_ioctl_bt848_h
    dlfcn_h
    dlopen
    dos_paths
    ebp_available
    ebx_available
    fast_64bit
    fast_cmov
    fast_unaligned
    fork
    gethrtime
    GetProcessTimes
    getrusage
    inet_aton
    inline_asm
    isatty
    ldbrx
    libdc1394_1
    libdc1394_2
    llrint
    log2
    loongson
    lrint
    lrintf
    lzo1x_999_compress
    machine_ioctl_bt848_h
    machine_ioctl_meteor_h
    malloc_h
    memalign
    mkstemp
    pld
    posix_memalign
    round
    roundf
    sdl
    sdl_video_size
    setmode
    socklen_t
    soundcard_h
    poll_h
    sys_mman_h
    sys_resource_h
    sys_select_h
    sys_soundcard_h
    sys_videoio_h
    ten_operands
    termios_h
    threads
    truncf
    vfp_args
    VirtualAlloc
    winsock2_h
    xform_asm
    yasm
"

# options emitted with CONFIG_ prefix but not available on command line
CONFIG_EXTRA="
    gplv3
    lgplv3
"

CMDLINE_SELECT="
    $ARCH_EXT_LIST
    $CONFIG_LIST
    $THREADS_LIST
    cross_compile
    debug
    extra_warnings
    logging
    optimizations
    stripping
    yasm
"

PATHS_LIST='
    bindir
    datadir
    incdir
    libdir
    mandir
    prefix
    shlibdir
'

CMDLINE_SET="
    $PATHS_LIST
    arch
    as
    build_suffix
    cc
    cpu
    cross_prefix
    dep_cc
    extra_version
    host_cc
    host_cflags
    host_ldflags
    host_libs
    host_os
    ld
    logfile
    nm
    source_path
    sysinclude
    sysroot
    target_exec
    target_os
    target_path
"

CMDLINE_APPEND="
    extra_cflags
"

# code dependency declarations

# architecture extensions
altivec_deps="ppc"
amd3dnow_deps="mmx"
amd3dnowext_deps="amd3dnow"
armv5te_deps="arm"
armv6_deps="arm"
armv6t2_deps="arm"
armvfp_deps="arm"
iwmmxt_deps="arm"
mmi_deps="mips"
mmx_deps="x86"
mmx2_deps="mmx"
neon_deps="arm"
ppc4xx_deps="ppc"
sse_deps="mmx"
ssse3_deps="sse"
vis_deps="sparc"

need_memalign="altivec neon sse"
inline_asm_deps="!tms470"

# decoders / encoders / hardware accelerators
aac_decoder_select="fft mdct"
aac_encoder_select="fft mdct"
ac3_decoder_select="fft mdct"
atrac3_decoder_select="fft mdct"
cavs_decoder_select="golomb"
cook_decoder_select="fft mdct"
cscd_decoder_suggest="zlib"
dca_decoder_select="fft mdct"
dnxhd_encoder_select="aandct"
dxa_decoder_select="zlib"
eac3_decoder_select="ac3_decoder"
eamad_decoder_select="aandct"
eatgq_decoder_select="aandct"
eatqi_decoder_select="aandct"
ffv1_decoder_select="golomb"
flac_decoder_select="golomb"
flac_encoder_select="golomb"
flashsv_decoder_select="zlib"
flashsv_encoder_select="zlib"
flv_encoder_select="h263_encoder"
h261_encoder_select="aandct"
h263_encoder_select="aandct"
h263_vaapi_hwaccel_deps="va_va_h"
h263_vaapi_hwaccel_select="vaapi h263_decoder"
h263p_encoder_select="h263_encoder"
h264_decoder_select="golomb"
h264_vaapi_hwaccel_deps="va_va_h"
h264_vaapi_hwaccel_select="vaapi"
h264_vdpau_decoder_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
h264_vdpau_decoder_select="vdpau h264_decoder"
imc_decoder_select="fft mdct"
jpegls_decoder_select="golomb"
jpegls_encoder_select="golomb"
ljpeg_encoder_select="aandct"
loco_decoder_select="golomb"
mjpeg_encoder_select="aandct"
mpeg1video_encoder_select="aandct"
mpeg2video_encoder_select="aandct"
mpeg4_encoder_select="h263_encoder"
mpeg_vdpau_decoder_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
mpeg_vdpau_decoder_select="vdpau mpegvideo_decoder"
mpeg1_vdpau_decoder_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
mpeg1_vdpau_decoder_select="vdpau mpeg1video_decoder"
mpeg2_vaapi_hwaccel_deps="va_va_h"
mpeg2_vaapi_hwaccel_select="vaapi mpeg2video_decoder"
mpeg4_vaapi_hwaccel_deps="va_va_h"
mpeg4_vaapi_hwaccel_select="vaapi mpeg4_decoder"
mpeg_xvmc_decoder_deps="X11_extensions_XvMClib_h"
mpeg_xvmc_decoder_select="mpegvideo_decoder"
msmpeg4v1_encoder_select="h263_encoder"
msmpeg4v2_encoder_select="h263_encoder"
msmpeg4v3_encoder_select="h263_encoder"
nellymoser_decoder_select="fft mdct"
nellymoser_encoder_select="fft mdct"
png_decoder_select="zlib"
png_encoder_select="zlib"
qdm2_decoder_select="fft mdct rdft"
rv10_encoder_select="h263_encoder"
rv20_encoder_select="h263_encoder"
rv30_decoder_select="golomb"
rv40_decoder_select="golomb"
shorten_decoder_select="golomb"
sonic_decoder_select="golomb"
sonic_encoder_select="golomb"
sonic_ls_encoder_select="golomb"
svq3_decoder_select="golomb"
svq3_decoder_suggest="zlib"
theora_decoder_select="vp3_decoder"
tiff_decoder_suggest="zlib"
tiff_encoder_suggest="zlib"
tscc_decoder_select="zlib"
vc1_vaapi_hwaccel_deps="va_va_h"
vc1_vaapi_hwaccel_select="vaapi vc1_decoder"
vc1_vdpau_decoder_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
vc1_vdpau_decoder_select="vdpau vc1_decoder"
vorbis_decoder_select="fft mdct"
vorbis_encoder_select="fft mdct"
vp6a_decoder_select="vp6_decoder"
vp6f_decoder_select="vp6_decoder"
wmav1_decoder_select="fft mdct"
wmav1_encoder_select="fft mdct"
wmav2_decoder_select="fft mdct"
wmav2_encoder_select="fft mdct"
wmv1_encoder_select="h263_encoder"
wmv2_encoder_select="h263_encoder"
wmv3_decoder_select="vc1_decoder"
wmv3_vaapi_hwaccel_select="vc1_vaapi_hwaccel"
wmv3_vdpau_decoder_select="vc1_vdpau_decoder"
zlib_decoder_select="zlib"
zlib_encoder_select="zlib"
zmbv_decoder_select="zlib"
zmbv_encoder_select="zlib"

# parsers
h264_parser_select="golomb"

# external libraries
libdirac_decoder_deps="libdirac !libschroedinger"
libdirac_encoder_deps="libdirac"
libfaac_encoder_deps="libfaac"
libfaad_decoder_deps="libfaad"
libfaadbin_decoder_extralibs='$ldl'
libgsm_decoder_deps="libgsm"
libgsm_encoder_deps="libgsm"
libgsm_ms_decoder_deps="libgsm"
libgsm_ms_encoder_deps="libgsm"
libmp3lame_encoder_deps="libmp3lame"
libopencore_amrnb_decoder_deps="libopencore_amrnb"
libopencore_amrnb_encoder_deps="libopencore_amrnb"
libopencore_amrwb_decoder_deps="libopencore_amrwb"
libopenjpeg_decoder_deps="libopenjpeg"
libschroedinger_decoder_deps="libschroedinger"
libschroedinger_encoder_deps="libschroedinger"
libspeex_decoder_deps="libspeex"
libtheora_encoder_deps="libtheora"
libvorbis_encoder_deps="libvorbis"
libx264_encoder_deps="libx264"
libxvid_encoder_deps="libxvid"

# demuxers / muxers
ac3_demuxer_deps="ac3_parser"
asf_stream_muxer_select="asf_muxer"
avisynth_demuxer_deps="avisynth"
dirac_demuxer_deps="dirac_parser"
ipod_muxer_select="mov_muxer"
libnut_demuxer_deps="libnut"
libnut_muxer_deps="libnut"
matroska_audio_muxer_select="matroska_muxer"
matroska_demuxer_suggest="zlib bzlib"
mov_demuxer_suggest="zlib"
mp3_demuxer_deps="mpegaudio_parser"
mp4_muxer_select="mov_muxer"
mpegtsraw_demuxer_select="mpegts_demuxer"
mxf_d10_muxer_select="mxf_muxer"
psp_muxer_select="mov_muxer"
redir_demuxer_deps="network"
rtp_muxer_deps="network rtp_protocol"
rtsp_demuxer_deps="sdp_demuxer"
sdp_demuxer_deps="rtp_protocol mpegts_demuxer"
tg2_muxer_select="mov_muxer"
tgp_muxer_select="mov_muxer"

# indevs / outdevs
alsa_indev_deps="alsa_asoundlib_h snd_pcm_htimestamp"
alsa_indev_extralibs="-lasound"
alsa_outdev_deps="alsa_asoundlib_h"
alsa_outdev_extralibs="-lasound"
audio_beos_indev_deps="audio_beos"
audio_beos_indev_extralibs="-lmedia -lbe"
audio_beos_outdev_deps="audio_beos"
audio_beos_outdev_extralibs="-lmedia -lbe"
bktr_indev_deps_any="dev_bktr_ioctl_bt848_h machine_ioctl_bt848_h dev_video_bktr_ioctl_bt848_h dev_ic_bt8xx_h"
dv1394_indev_deps="dv1394 dv_demuxer"
jack_indev_deps="jack_jack_h"
jack_indev_extralibs="-ljack"
libdc1394_indev_deps="libdc1394"
oss_indev_deps_any="soundcard_h sys_soundcard_h"
oss_outdev_deps_any="soundcard_h sys_soundcard_h"
v4l_indev_deps="linux_videodev_h"
v4l2_indev_deps_any="linux_videodev2_h sys_videoio_h"
vfwcap_indev_deps="capCreateCaptureWindow"
vfwcap_indev_extralibs="-lvfw32"
x11_grab_device_indev_deps="x11grab XShmCreateImage"
x11_grab_device_indev_extralibs="-lX11 -lXext"

# protocols
gopher_protocol_deps="network"
http_protocol_deps="network"
rtmp_protocol_deps="tcp_protocol"
rtp_protocol_deps="udp_protocol"
tcp_protocol_deps="network"
udp_protocol_deps="network"

# filters
movie_filter_deps="avfilter_lavf"

# programs
ffplay_deps="sdl"
ffserver_deps="ffm_muxer rtp_protocol rtsp_demuxer"
ffserver_extralibs='$ldl'


# default parameters

logfile="config.err"

# installation paths
prefix_default="/usr/local"
bindir_default='${prefix}/bin'
datadir_default='${prefix}/share/ffmpeg'
incdir_default='${prefix}/include'
libdir_default='${prefix}/lib'
mandir_default='${prefix}/share/man'
shlibdir_default="$libdir_default"

# toolchain
ar="ar"
cc_default="gcc"
host_cc_default="gcc"
ln_s="ln -sf"
nm_default="nm"
objformat="elf"
ranlib="ranlib"
strip="strip"
yasmexe="yasm"

# machine
arch=$(uname -m)
cpu="generic"

# OS
target_os=$(tolower $(uname -s))
host_os=$target_os

# configurable options
enable debug
enable fastdiv
enable ffmpeg
enable ffplay
enable ffserver
enable ipv6
enable mpegaudio_hp
enable network
enable optimizations
enable protocols
enable static
enable stripping
enable swscale_alpha

# build settings
SHFLAGS='-shared -Wl,-soname,$$(@F)'
FFSERVERLDFLAGS=-Wl,-E
LIBPREF="lib"
LIBSUF=".a"
FULLNAME='$(NAME)$(BUILDSUF)'
LIBNAME='$(LIBPREF)$(FULLNAME)$(LIBSUF)'
SLIBPREF="lib"
SLIBSUF=".so"
SLIBNAME='$(SLIBPREF)$(FULLNAME)$(SLIBSUF)'
SLIBNAME_WITH_VERSION='$(SLIBNAME).$(LIBVERSION)'
SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'

CC_O='-o $@'

host_cflags='-O3 -g -Wall'
host_libs='-lm'

target_path='.'

# gcc stupidly only outputs the basename of targets with -MM, but we need the
# full relative path for objects in subdirectories for non-recursive Make.
DEPEND_CMD='$(DEPCC) $(DEPFLAGS) $< | sed -e "/^\#.*/d" -e "s,^[[:space:]]*$(*F)\\.o,$(@D)/$(*F).o," > $(@:.o=.d)'
DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -MM'

# find source path
source_path="$(dirname "$0")"
enable source_path_used
if test -f configure; then
    source_path="$(pwd)"
    disable source_path_used
else
    source_path="$(cd "$source_path"; pwd)"
    echo "$source_path" | grep -q '[[:blank:]]' &&
        die "Out of tree builds are impossible with whitespace in source path."
    test -e "$source_path/config.h" &&
        die "Out of tree builds are impossible with config.h in source dir."
fi

for v in "$@"; do
    r=${v#*=}
    l=${v%"$r"}
    r=$(sh_quote "$r")
    FFMPEG_CONFIGURATION="${FFMPEG_CONFIGURATION# } ${l}${r}"
done

find_things(){
    thing=$1
    pattern=$2
    file=$source_path/$3
    sed -n "s/^[^#]*$pattern.*([^,]*, *\([^,]*\)\(,.*\)*).*/\1_$thing/p" "$file"
}

ENCODER_LIST=$(find_things  encoder  ENC      libavcodec/allcodecs.c)
DECODER_LIST=$(find_things  decoder  DEC      libavcodec/allcodecs.c)
HWACCEL_LIST=$(find_things  hwaccel  HWACCEL  libavcodec/allcodecs.c)
PARSER_LIST=$(find_things   parser   PARSER   libavcodec/allcodecs.c)
BSF_LIST=$(find_things      bsf      BSF      libavcodec/allcodecs.c)
MUXER_LIST=$(find_things    muxer    _MUX     libavformat/allformats.c)
DEMUXER_LIST=$(find_things  demuxer  DEMUX    libavformat/allformats.c)
OUTDEV_LIST=$(find_things   outdev   OUTDEV   libavdevice/alldevices.c)
INDEV_LIST=$(find_things    indev    _IN      libavdevice/alldevices.c)
PROTOCOL_LIST=$(find_things protocol PROTOCOL libavformat/allformats.c)
FILTER_LIST=$(find_things   filter   FILTER   libavfilter/allfilters.c)

enable $ARCH_EXT_LIST \
       $DECODER_LIST \
       $ENCODER_LIST \
       $HWACCEL_LIST \
       $PARSER_LIST \
       $BSF_LIST \
       $DEMUXER_LIST \
       $MUXER_LIST \
       $FILTER_LIST \
       $PROTOCOL_LIST \
       $INDEV_LIST \
       $OUTDEV_LIST \

die_unknown(){
    echo "Unknown option \"$1\"."
    echo "See $0 --help for available options."
    exit 1
}

show_list() {
    suffix=_$1
    shift
    echo $* | sed s/$suffix//g | tr ' ' '\n' | sort
    exit 0
}

for opt do
    optval="${opt#*=}"
    case "$opt" in
    --extra-ldflags=*) add_ldflags $optval
    ;;
    --extra-libs=*) add_extralibs $optval
    ;;
    --disable-devices) disable $INDEV_LIST $OUTDEV_LIST
    ;;
    --enable-debug=*) debuglevel="$optval"
    ;;
    --enable-*=*|--disable-*=*)
    eval $(echo "${opt%%=*}" | sed 's/--/action=/;s/-/ thing=/')
    is_in "${thing}s" $COMPONENT_LIST || die_unknown "$opt"
    eval list=\$$(toupper $thing)_LIST
    name=$(echo "${optval}" | sed "s/,/_${thing}|/g")_${thing}
    $action $(filter "$name" $list)
    ;;
    --enable-?*|--disable-?*)
    eval $(echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g')
    if is_in $option $COMPONENT_LIST; then
        test $action = disable && action=unset
        eval $action \$$(toupper ${option%s})_LIST
    elif is_in $option $CMDLINE_SELECT; then
        $action $option
    else
        die_unknown $opt
    fi
    ;;
    --list-*)
        NAME="${opt#--list-}"
        is_in $NAME $COMPONENT_LIST || die_unknown $opt
        NAME=${NAME%s}
        eval show_list $NAME \$$(toupper $NAME)_LIST
    ;;
    --help|-h) show_help
    ;;
    *)
    optname="${opt%%=*}"
    optname="${optname#--}"
    optname=$(echo "$optname" | sed 's/-/_/g')
    if is_in $optname $CMDLINE_SET; then
        eval $optname='$optval'
    elif is_in $optname $CMDLINE_APPEND; then
        append $optname "$optval"
    else
         die_unknown $opt
    fi
    ;;
    esac
done

disabled logging && logfile=/dev/null

echo "# $0 $FFMPEG_CONFIGURATION" > $logfile
set >> $logfile

test -n "$cross_prefix" && enable cross_compile

ar="${cross_prefix}${ar}"
cc_default="${cross_prefix}${cc_default}"
nm_default="${cross_prefix}${nm_default}"
ranlib="${cross_prefix}${ranlib}"
strip="${cross_prefix}${strip}"

sysinclude_default="${sysroot}/usr/include"

set_default cc nm sysinclude
enabled cross_compile || host_cc_default=$cc
set_default host_cc

exesuf() {
    case $1 in
        mingw32*|cygwin*|*-dos|freedos|opendos|os/2*) echo .exe ;;
    esac
}

EXESUF=$(exesuf $target_os)
HOSTEXESUF=$(exesuf $host_os)

# set temporary file name
: ${TMPDIR:=$TEMPDIR}
: ${TMPDIR:=$TMP}
: ${TMPDIR:=/tmp}

if ! check_cmd type mktemp; then
    # simple replacement for missing mktemp
    # NOT SAFE FOR GENERAL USE
    mktemp(){
        echo "${2%XXX*}.${HOSTNAME}.${UID}.$$"
    }
fi

tmpfile(){
    tmp=$(mktemp -u "${TMPDIR}/ffconf.XXXXXXXX")$2 &&
        (set -C; exec > $tmp) 2>/dev/null ||
        die "Unable to create temporary file in $TMPDIR."
    append TMPFILES $tmp
    eval $1=$tmp
}

trap 'rm -f -- $TMPFILES' EXIT
trap exit HUP INT TERM

tmpfile TMPC  .c
tmpfile TMPE  $EXESUF
tmpfile TMPH  .h
tmpfile TMPO  .o
tmpfile TMPS  .S
tmpfile TMPSH .sh

unset -f mktemp

# make sure we can execute files in $TMPDIR
cat > $TMPSH 2>> $logfile <<EOF
#! /bin/sh
EOF
chmod +x $TMPSH >> $logfile 2>&1
if ! $TMPSH >> $logfile 2>&1; then
    cat <<EOF
Unable to create and execute files in $TMPDIR.  Set the TMPDIR environment
variable to another directory and make sure that it is not mounted noexec.
EOF
    die "Sanity test failed."
fi

filter_cflags=echo
filter_cppflags=echo
filter_asflags=echo

if   $cc -v 2>&1 | grep -qi ^gcc; then
    cc_type=gcc
    if ! $cc -dumpversion | grep -q '^2\.'; then
        CC_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
        AS_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
    fi
elif $cc --version 2>/dev/null | grep -q Intel; then
    cc_type=icc
    CC_DEPFLAGS='-MMD'
    AS_DEPFLAGS='-MMD'
elif $cc -v 2>&1 | grep -q xlc; then
    cc_type=xlc
elif $cc -V 2>/dev/null | grep -q Compaq; then
    cc_type=ccc
    DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -M'
    debuglevel=3
    add_ldflags -Wl,-z,now # calls to libots crash without this
elif $cc --vsn 2>/dev/null | grep -q RVCT; then
    test -d "$sysroot" || die "No valid sysroot specified."
    cc_type=armcc
    armcc_conf="$PWD/armcc.conf"
    $cc --arm_linux_configure                 \
        --arm_linux_config_file="$armcc_conf" \
        --configure_sysroot="$sysroot"        \
        --configure_cpp_headers="$sysinclude" >>$logfile 2>&1 ||
        die "Error creating armcc configuration file."
    cc="$cc --arm_linux_config_file=$armcc_conf --translate_gcc"
    as_default="${cross_prefix}gcc"
    CC_DEPFLAGS='-MMD'
    AS_DEPFLAGS='-MMD'
elif $cc -version 2>/dev/null | grep -q TMS470; then
    cc_type=tms470
    cc="$cc --gcc --abi=eabi -eo=.o -mc -me"
    CC_O='-fr=$(@D)'
    as_default="${cross_prefix}gcc"
    ld_default="${cross_prefix}gcc"
    TMPO=$(basename $TMPC .c).o
    append TMPFILES $TMPO
    add_cflags -D__gnuc_va_list=va_list -D__USER_LABEL_PREFIX__=
    CC_DEPFLAGS='-ppa -ppd=$(@:.o=.d)'
    AS_DEPFLAGS='-MMD'
    filter_cflags=tms470_flags
    tms470_flags(){
        for flag; do
            case $flag in
                -march=*|-mcpu=*)
                    case "${flag#*=}" in
                        armv7-a|cortex-a*)      echo -mv=7a8 ;;
                        armv7-r|cortex-r*)      echo -mv=7r4 ;;
                        armv7-m|cortex-m*)      echo -mv=7m3 ;;
                        armv6*|arm11*)          echo -mv=6   ;;
                        armv5*e|arm[79]*e*|arm9[24]6*|arm96*|arm102[26])
                                                echo -mv=5e  ;;
                        armv4*|arm7*|arm9[24]*) echo -mv=4   ;;
                    esac
                    ;;
                -mfpu=neon)     echo --float_support=vfpv3 --neon ;;
                -mfpu=vfp)      echo --float_support=vfpv2        ;;
                -mfpu=softvfp)  echo --float_support=vfplib       ;;
                -Os)            echo -O3 -mf=2                    ;;
                -O[0-3])        echo $flag -mf=5                  ;;
                -g)             echo -g -mn                       ;;
            esac
        done
    }
fi

test -n "$cc_type" && enable $cc_type || echolog "Unknown C compiler $cc"

: ${as_default:=$cc}
: ${dep_cc_default:=$cc}
: ${ld_default:=$cc}
set_default as dep_cc ld

test -n "$CC_DEPFLAGS" || CCDEP=$DEPEND_CMD
test -n "$AS_DEPFLAGS" || ASDEP=$DEPEND_CMD

add_cflags $extra_cflags
add_asflags $extra_cflags

if test -n "$sysroot"; then
    case "$cc_type" in
        gcc)
            add_cppflags --sysroot="$sysroot"
            add_ldflags --sysroot="$sysroot"
        ;;
        tms470)
            add_cppflags -I"$sysinclude"
            add_ldflags  --sysroot="$sysroot"
        ;;
    esac
fi

if test "$cpu" = host; then
    enabled cross_compile && die "--cpu=host makes no sense when cross-compiling."

    case "$cc_type" in
        gcc)
            check_native(){
                $cc $1=native -v -c -o $TMPO $TMPC >$TMPE 2>&1 || return
                awk "/$1=/{ match(\$0, /$1=(\\w+)/, a);print a[1];exit }" $TMPE
            }
            cpu=$(check_native -march || check_native -mcpu)
        ;;
    esac

    test "${cpu:-host}" = host && die "--cpu=host not supported with compiler $cc"
fi

# Add processor-specific flags
case $cpu in
    601|ppc601|PowerPC601)
        cpuflags="-mcpu=601"
    ;;
    603*|ppc603*|PowerPC603*)
        cpuflags="-mcpu=603"
    ;;
    604*|ppc604*|PowerPC604*)
        cpuflags="-mcpu=604"
    ;;
    G3|g3|75*|ppc75*|PowerPC75*)
        cpuflags="-mcpu=750 -mpowerpc-gfxopt"
    ;;
    G4|g4|745*|ppc745*|PowerPC745*)
        cpuflags="-mcpu=7450 -mpowerpc-gfxopt"
    ;;
    74*|ppc74*|PowerPC74*)
        cpuflags="-mcpu=7400 -mpowerpc-gfxopt"
    ;;
    G5|g5|970|ppc970|PowerPC970|power4*|Power4*)
        cpuflags="-mcpu=970 -mpowerpc-gfxopt -mpowerpc64"
    ;;
    Cell|CELL|cell)
        cpuflags="-mcpu=cell"
        enable ldbrx
    ;;
    # targets that do NOT support conditional mov (cmov)
    i[345]86|pentium|pentium-mmx|k6|k6-[23]|winchip-c6|winchip2|c3)
        cpuflags="-march=$cpu"
        disable cmov
    ;;
    # targets that do support conditional mov (cmov)
    i686|pentiumpro|pentium[23]|pentium-m|athlon|athlon-tbird|athlon-4|athlon-[mx]p|athlon64|k8|opteron|athlon-fx|core2)
        cpuflags="-march=$cpu"
        enable cmov
        enable fast_cmov
    ;;
    # targets that do support conditional mov but on which it's slow
    pentium4|pentium4m|prescott|nocona)
        cpuflags="-march=$cpu"
        enable cmov
        disable fast_cmov
    ;;
    sparc64)
        cpuflags="-mcpu=v9"
    ;;
    arm11*|cortex*)
        cpuflags="-mcpu=$cpu"
        enable fast_unaligned
    ;;
    armv[67]*)
        cpuflags="-march=$cpu"
        enable fast_unaligned
    ;;
    armv*)
        cpuflags="-march=$cpu"
    ;;
    arm*)
        cpuflags="-mcpu=$cpu"
    ;;
    ev4|ev45|ev5|ev56|pca56|ev6|ev67)
        enabled ccc && cpuflags="-arch $cpu" || cpuflags="-mcpu=$cpu"
    ;;
    bf*)
        cpuflags="-mcpu=$cpu"
    ;;
    mips*|[45]k*|[237]4k*|m4k|r*000|loongson2[ef])
        cpuflags="-march=$cpu"
    ;;
    ap7[02]0[0-2])
        subarch="avr32_ap"
        cpuflags="-mpart=$cpu"
    ;;
    ap)
        subarch="avr32_ap"
        cpuflags="-march=$cpu"
    ;;
    uc3[ab]*)
        subarch="avr32_uc"
        cpuflags="-mcpu=$cpu"
    ;;
    uc)
        subarch="avr32_uc"
        cpuflags="-march=$cpu"
    ;;
    generic)
    ;;
    *)
        echo "WARNING: Unknown CPU \"$cpu\", ignored."
    ;;
esac

add_cflags $cpuflags
add_asflags $cpuflags

# compiler sanity check
check_exec <<EOF
int main(void){ return 0; }
EOF
if test "$?" != 0; then
    echo "$cc is unable to create an executable file."
    if test -z "$cross_prefix" && ! enabled cross_compile ; then
        echo "If $cc is a cross-compiler, use the --enable-cross-compile option."
        echo "Only do this if you know what cross compiling means."
    fi
    die "C compiler test failed."
fi

add_cppflags -D_ISOC99_SOURCE -D_POSIX_C_SOURCE=200112
check_cflags -std=c99
check_cc -D_FILE_OFFSET_BITS=64 <<EOF && add_cppflags -D_FILE_OFFSET_BITS=64
#include <stdlib.h>
EOF
check_cc -D_LARGEFILE_SOURCE <<EOF && add_cppflags -D_LARGEFILE_SOURCE
#include <stdlib.h>
EOF

case "$arch" in
    alpha)
        arch="alpha"
        enable fast_64bit
        check_cflags -mieee
        spic=$shared
    ;;
    arm|armv[4567]*l)
        arch="arm"
    ;;
    avr32)
    ;;
    bfin)
        arch="bfin"
    ;;
    ia64)
        arch="ia64"
        enable fast_64bit
        spic=$shared
    ;;
    m68k)
        arch="m68k"
    ;;
    mips|mipsel|IP*)
        arch="mips"
        spic=$shared
    ;;
    mips64)
        arch="mips"
        subarch="mips64"
        enable fast_64bit
        spic=$shared
    ;;
    parisc|hppa)
        arch="parisc"
        spic=$shared
    ;;
    parisc64|hppa64)
        arch="parisc"
        enable fast_64bit
        spic=$shared
    ;;
    "Power Macintosh"|ppc|powerpc)
        arch="ppc"
        enable fast_unaligned
    ;;
    ppc64)
        arch="ppc"
        subarch="ppc64"
        enable fast_64bit
        enable fast_unaligned
    ;;
    s390|s390x)
        arch="s390"
    ;;
    sh4|sh)
        arch="sh4"
    ;;
    sparc)
        arch="sparc"
        spic=$shared
    ;;
    sun4u|sparc64)
        arch="sparc"
        subarch="sparc64"
        enable fast_64bit
        spic=$shared
    ;;
    i386|i486|i586|i686|i86pc|BePC)
        arch="x86"
        subarch="x86_32"
        enable fast_unaligned
    ;;
    x86_64|amd64)
        arch="x86"
        subarch="x86_32"
        enable cmov
        enable fast_cmov
        enable fast_unaligned
        check_cc <<EOF && enable fast_64bit && subarch="x86_64" && spic=$shared
        int test[sizeof(char*) - 7];
EOF
    ;;
    *)
        arch="unknown"
    ;;
esac

enable $arch $subarch
enabled spic && enable pic

# OS specific
case $target_os in
    beos|haiku|zeta)
        prefix_default="$HOME/config"
        # helps building libavcodec
        add_cppflags -DPIC
        add_cflags -fomit-frame-pointer
        # 3 gcc releases known for BeOS, each with ugly bugs
        gcc_version="$($cc -v 2>&1 | grep version | cut -d ' ' -f3-)"
        case "$gcc_version" in
          2.9-beos-991026*|2.9-beos-000224*) echo "R5/GG gcc"
            disable mmx
            ;;
          *20010315*) echo "BeBits gcc"
            add_cflags -fno-expensive-optimizations
            ;;
        esac
        SHFLAGS=-nostart
        # enable BeOS things
        enable audio_beos
        # no need for libm, but the inet stuff
        # Check for BONE
        # XXX: actually should check for NOT net_server
        if echo $BEINCLUDES | grep -q 'headers/be/bone'; then
            network_extralibs="-lbind -lsocket"
        else
            enable beos_netserver
            network_extralibs="-lnet"
        fi ;;
    sunos)
        FFSERVERLDFLAGS=""
        SHFLAGS='-shared -Wl,-h,$$(@F)'
        network_extralibs="-lsocket -lnsl"
        add_cppflags -D__EXTENSIONS__
        ;;
    netbsd)
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        ;;
    openbsd)
        enable malloc_aligned
        enable pic
        SHFLAGS='-shared'
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        ;;
    freebsd|dragonfly)
        enable malloc_aligned
        ;;
    bsd/os)
        osextralibs="-lpoll -lgnugetopt"
        strip="strip -d"
        ;;
    darwin)
        enable malloc_aligned
        SHFLAGS='-dynamiclib -Wl,-single_module -Wl,-install_name,$(SHLIBDIR)/$(SLIBNAME),-current_version,$(LIBVERSION),-compatibility_version,$(LIBMAJOR) -Wl,-read_only_relocs,suppress'
        strip="strip -x"
        FFLDFLAGS="-Wl,-dynamic,-search_paths_first"
        SLIBSUF=".dylib"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME).$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME).$(LIBMAJOR)$(SLIBSUF)'
        FFSERVERLDFLAGS=-Wl,-bind_at_load
        objformat="macho"
        enabled x86_64 && objformat="macho64"
        enabled shared ||
            { check_cflags -mdynamic-no-pic && add_asflags -mdynamic-no-pic; }
        ;;
    mingw32*)
        if test $target_os = "mingw32ce"; then
            disable network
        else
            target_os=mingw32
        fi
        LIBTARGET=i386
        if enabled x86_64; then
            enable malloc_aligned
            LIBTARGET=x64
        elif enabled arm; then
            LIBTARGET=arm
        fi
        shlibdir_default="$bindir_default"
        disable ffserver
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        SLIB_EXTRA_CMD='-lib.exe /machine:$(LIBTARGET) /def:$$(@:$(SLIBSUF)=.def) /out:$(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib)'
        SLIB_INSTALL_EXTRA_CMD='-install -m 644 $(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib) "$(SHLIBDIR)/$(SLIBNAME:$(SLIBSUF)=.lib)"; \
            install -m 644 $(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib) "$(SHLIBDIR)/$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib)"; \
            install -d "$(LIBDIR)"; \
            install -m 644 $(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) "$(LIBDIR)/lib$(SLIBNAME:$(SLIBSUF)=.dll.a)"'
        SLIB_UNINSTALL_EXTRA_CMD='rm -f "$(SHLIBDIR)/$(SLIBNAME:$(SLIBSUF)=.lib)"'
        SHFLAGS='-shared -Wl,--output-def,$$(@:$(SLIBSUF)=.def) -Wl,--out-implib,$(SUBDIR)lib$(SLIBNAME:$(SLIBSUF)=.dll.a) -Wl,--enable-runtime-pseudo-reloc -Wl,--enable-auto-image-base'
        objformat="win32"
        enable dos_paths
        check_cflags -fno-common
        if ! enabled x86_64; then
            check_cpp_condition _mingw.h "(__MINGW32_MAJOR_VERSION > 3) || (__MINGW32_MAJOR_VERSION == 3 && __MINGW32_MINOR_VERSION >= 15)" ||
                die "ERROR: MinGW runtime version must be >= 3.15."
            enabled_any avisynth vfwcap_indev &&
                { check_cpp_condition w32api.h "(__W32API_MAJOR_VERSION > 3) || (__W32API_MAJOR_VERSION == 3 && __W32API_MINOR_VERSION >= 13)" ||
                  die "ERROR: avisynth and vfwcap_indev require w32api version 3.13 or later."; }
            fi
        ;;
    cygwin*)
        target_os=cygwin
        shlibdir_default="$bindir_default"
        SLIBPREF="cyg"
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
        SHFLAGS='-shared -Wl,--enable-auto-image-base'
        objformat="win32"
        enable dos_paths
        check_cflags -fno-common
        ;;
    *-dos|freedos|opendos)
        disable ffplay ffserver
        disable $INDEV_LIST $OUTDEV_LIST
        network_extralibs="-lsocket"
        objformat="coff"
        enable dos_paths
        ;;
    linux)
        enable dv1394
        ;;
    irix*)
        target_os=irix
        ranlib="echo ignoring ranlib"
        ;;
    os/2*)
        strip="lxlite"
        ln_s="cp -f"
        FFLDFLAGS="-Zomf -Zbin-files -Zargs-wild -Zmap"
        SHFLAGS='$(SUBDIR)$(NAME).def -Zdll -Zomf'
        FFSERVERLDFLAGS=""
        LIBSUF="_s.a"
        SLIBPREF=""
        SLIBSUF=".dll"
        SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)-$(LIBVERSION)$(SLIBSUF)'
        SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(shell echo $(NAME) | cut -c1-6)$(LIBMAJOR)$(SLIBSUF)'
        SLIB_CREATE_DEF_CMD='echo LIBRARY $(SLIBNAME_WITH_MAJOR) INITINSTANCE TERMINSTANCE > $(SUBDIR)$(NAME).def; \
          echo PROTMODE >> $(SUBDIR)$(NAME).def; \
          echo CODE PRELOAD MOVEABLE DISCARDABLE >> $(SUBDIR)$(NAME).def; \
          echo DATA PRELOAD MOVEABLE MULTIPLE NONSHARED >> $(SUBDIR)$(NAME).def; \
          echo EXPORTS >> $(SUBDIR)$(NAME).def; \
          emxexp -o $(OBJS) >> $(SUBDIR)$(NAME).def'
        SLIB_EXTRA_CMD='emximp -o $(SUBDIR)$(LIBPREF)$(NAME)_dll.a $(SUBDIR)$(NAME).def; \
          emximp -o $(SUBDIR)$(LIBPREF)$(NAME)_dll.lib $(SUBDIR)$(NAME).def;'
        SLIB_INSTALL_EXTRA_CMD='install -m 644 $(SUBDIR)$(LIBPREF)$(NAME)_dll.a $(SUBDIR)$(LIBPREF)$(NAME)_dll.lib "$(LIBDIR)"'
        SLIB_UNINSTALL_EXTRA_CMD='rm -f "$(LIBDIR)"/$(LIBPREF)$(NAME)_dll.a "$(LIBDIR)"/$(LIBPREF)$(NAME)_dll.lib'
        enable dos_paths
        ;;
    gnu/kfreebsd)
        ;;
    gnu)
        ;;

    *)
        die "Unknown OS '$target_os'."
        ;;
esac

set_default $PATHS_LIST

add_extralibs $osextralibs

# Combine FFLDFLAGS and the LDFLAGS environment variable.
LDFLAGS="$FFLDFLAGS $LDFLAGS"

# we need to build at least one lib type
if ! enabled_any static shared; then
    cat <<EOF
At least one library type must be built.
Specify --enable-static to build the static libraries or --enable-shared to
build the shared libraries as well. To only build the shared libraries specify
--disable-static in addition to --enable-shared.
EOF
    exit 1;
fi

disabled static && LIBNAME=""

if enabled_any libfaad libfaadbin ; then
    if check_header faad.h; then
        check_cc <<EOF
#include <faad.h>
#ifndef FAAD2_VERSION
ok faad1
#endif
int main(void) { return 0; }
EOF
        test $? = 0 && enable libfaad2
    else
        die "FAAD test failed."
    fi
fi


die_license_disabled() {
    enabled $1 || { enabled $2 && die "$2 is $1 and --enable-$1 is not specified."; }
}

die_license_disabled gpl libfaad2
die_license_disabled gpl libx264
die_license_disabled gpl libxvid
die_license_disabled gpl postproc
die_license_disabled gpl x11grab

die_license_disabled nonfree libfaac

die_license_disabled version3 libopencore_amrnb
die_license_disabled version3 libopencore_amrwb

enabled version3 && { enabled gpl && enable gplv3 || enable lgplv3; }

check_deps $ARCH_EXT_LIST

disabled optimizations || check_cflags -fomit-frame-pointer

if enabled pic; then
    add_cppflags -DPIC
    add_cflags   -fPIC
    add_asflags  -fPIC
fi

check_cc <<EOF || die "Symbol mangling check failed."
int ff_extern;
EOF
sym=$($nm -P -g $TMPO | grep ff_extern)
extern_prefix=${sym%%ff_extern*}

check_cc <<EOF && enable inline_asm
void foo(void) { __asm__ volatile ("" ::); }
EOF

_restrict=
for restrict_keyword in restrict __restrict__ __restrict; do
    check_cc <<EOF && _restrict=$restrict_keyword && break
void foo(char * $restrict_keyword p);
EOF
done

check_cc <<EOF && enable attribute_packed
struct { int x; } __attribute__((packed)) x;
EOF

check_cc <<EOF || die "endian test failed"
unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
EOF
od -A n -t x1 $TMPO | grep -q '42 *49 *47 *45' && enable bigendian

if enabled arm; then

    check_ld <<EOF && enable vfp_args
__asm__ (".eabi_attribute 28, 1");
int main(void) { return 0; }
EOF

    # We have to check if pld is a nop and disable it.
    check_asm pld '"pld [r0]"'

    enabled armv5te && check_asm armv5te '"qadd r0, r0, r0"'
    enabled armv6   && check_asm armv6   '"sadd16 r0, r0, r0"'
    enabled armv6t2 && check_asm armv6t2 '"movt r0, #0"'
    enabled armvfp  && check_asm armvfp  '"fadds s0, s0, s0"'
    enabled iwmmxt  && check_asm iwmmxt  '"wunpckelub wr6, wr4"'
    enabled neon    && check_asm neon    '"vadd.i16 q0, q0, q0"'

elif enabled mips; then

    check_asm loongson '"dmult.g $1, $2, $3"'
    enabled mmi     && check_asm mmi     '"lq $2, 0($2)"'

elif enabled ppc; then

    check_asm dcbzl     '"dcbzl 0, 1"'
    check_asm ppc4xx    '"maclhw r10, r11, r12"'
    check_asm xform_asm '"lwzx 0, %y0" :: "Z"(*(int*)0)'

    # AltiVec flags: The FSF version of GCC differs from the Apple version
    if enabled altivec; then
        check_cflags -maltivec -mabi=altivec &&
        { check_header altivec.h && inc_altivec_h="#include <altivec.h>" ; } ||
        check_cflags -faltivec

        # check if our compiler supports Motorola AltiVec C API
        check_cc <<EOF || disable altivec
$inc_altivec_h
int main(void) {
    vector signed int v1, v2, v3;
    v1 = vec_add(v2,v3);
    return 0;
}
EOF

        # check if our compiler supports braces for vector declarations
        check_cc <<EOF || die "You need a compiler that supports {} in AltiVec vector declarations."
$inc_altivec_h
int main (void) { (vector int) {1}; return 0; }
EOF
    fi

elif enabled sparc; then

    enabled vis && check_asm vis '"pdist %f0, %f0, %f0"' -mcpu=ultrasparc &&
        add_cflags -mcpu=ultrasparc -mtune=ultrasparc

elif enabled x86; then

    # check whether EBP is available on x86
    # As 'i' is stored on the stack, this program will crash
    # if the base pointer is used to access it because the
    # base pointer is cleared in the inline assembly code.
    check_exec_crash <<EOF && enable ebp_available
    volatile int i=0;
    __asm__ volatile (
        "xorl %%ebp, %%ebp"
    ::: "%ebp");
    return i;
EOF

    # check wether EBX is available on x86
    check_asm ebx_available '"":::"%ebx"'

    # check whether more than 10 operands are supported
    check_cc <<EOF && enable ten_operands
int main(void) {
    int x=0;
    __asm__ volatile(
        ""
        :"+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x), "+&rm"(x)
    );
    return 0;
}
EOF

    # check whether binutils is new enough to compile SSSE3/MMX2
    enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"'
    enabled mmx2  && check_asm mmx2  '"pmaxub %mm0, %mm1"'

    check_asm bswap '"bswap %%eax" ::: "%eax"'

    YASMFLAGS="-f $objformat -DARCH_$(toupper $subarch)"
    enabled     x86_64        && append YASMFLAGS "-m amd64"
    enabled_all x86_64 shared && append YASMFLAGS "-DPIC"
    case "$objformat" in
        elf) enabled debug && append YASMFLAGS "-g dwarf2" ;;
        macho64)              append YASMFLAGS "-DPIC -DPREFIX" ;;
        *)                    append YASMFLAGS "-DPREFIX"  ;;
    esac
    disabled yasm || { check_yasm "pabsw xmm0, xmm0" && enable yasm; }

fi

if check_func dlopen; then
    ldl=
elif check_func dlopen -ldl; then
    ldl=-ldl
fi

# Solaris has nanosleep in -lrt, OpenSolaris no longer needs that
check_func nanosleep || { check_func nanosleep -lrt && add_extralibs -lrt; }

check_func  fork
check_func  gethrtime
check_func  getrusage