configure

  --disable-bsfs) disable $BSF_LIST
  ;;
  --disable-protocols) disable $PROTOCOL_LIST
  ;;
  --enable-*=*|--disable-*=*)
  eval `echo "$opt" | sed 's/=/-/;s/--/action=/;s/-/ thing=/;s/-/ name=/'`
  case "$thing" in
      encoder|decoder|muxer|demuxer|parser|bsf|protocol) $action ${optval}_${thing} ;;
      *) die_unknown "$opt" ;;
  esac
  ;;
  --enable-?*|--disable-?*)
  eval `echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g'`
  echo "$CMDLINE_SELECT" | grep -q "^ *$option\$" || die_unknown $opt
  $action $option
  ;;
  --list-*)
    NAME="${opt#--list-}"
    is_in $NAME $COMPONENT_LIST || die_unknown $opt
    NAME=$(toupper ${NAME%s})
    eval show_list \$${NAME}_LIST
  ;;
  --help|-h) show_help
  ;;
  *)
  die_unknown $opt
  ;;
  esac
done

case "$arch" in
  i386|i486|i586|i686|i86pc|BePC)
    arch="x86_32"
    enable fast_unaligned
  ;;
  x86_64|amd64)
    arch="x86_32"
    enable fast_unaligned
    canon_arch="`$cc -dumpmachine | sed -e 's,\([^-]*\)-.*,\1,'`"
    if [ x"$canon_arch" = x"x86_64" -o x"$canon_arch" = x"amd64" ]; then
      if [ -z "`echo $CFLAGS | grep -- -m32`"  ]; then
        arch="x86_64"
        enable fast_64bit
      fi
    fi
  ;;
  # armv4l is a subset of armv[567]*l
  arm|armv[4567]*l)
    arch="armv4l"
  ;;
  alpha)
    arch="alpha"
    enable fast_64bit
  ;;
  "Power Macintosh"|ppc|powerpc)
    arch="powerpc"
  ;;
  ppc64)
    arch="powerpc"
    enable fast_64bit
  ;;
  mips|mipsel|IP*)
    arch="mips"
  ;;
  sun4u|sparc64)
    arch="sparc64"
    enable fast_64bit
  ;;
  sparc)
    arch="sparc"
  ;;
  sh4)
    arch="sh4"
  ;;
  parisc)
    arch="parisc"
  ;;
  parisc64)
    arch="parisc"
    enable fast_64bit
  ;;
  s390|s390x)
    arch="s390"
  ;;
  m68k)
    arch="m68k"
  ;;
  ia64)
    arch="ia64"
    enable fast_64bit
  ;;
  bfin)
    arch="bfin"
  ;;
  *)
    arch="unknown"
  ;;
esac

enable $arch
enabled_any x86_32 x86_64 && enable x86
enabled     sparc64       && enable sparc

# OS specific
case $targetos in
  beos|haiku|zeta)
    PREFIX="$HOME/config"
    # helps building libavcodec
    add_cflags "-DPIC -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
    LDCONFIG="echo ignoring ldconfig"
    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 $BEINCLUDES|grep 'headers/be/bone' >/dev/null); then
        network_extralibs="-lbind -lsocket"
    else
        enable beos_netserver
        network_extralibs="-lnet"
    fi ;;
  sunos)
    FFSERVERLDFLAGS=""
    SHFLAGS='-shared -Wl,-h,$@'
    network_extralibs="-lsocket -lnsl"
    ;;
  netbsd)
    oss_demuxer_extralibs="-lossaudio"
    oss_muxer_extralibs="-lossaudio"
    ;;
  openbsd)
    disable need_memalign
    LIBOBJFLAGS='$(PIC)'
    LDCONFIG='ldconfig -m $(SHLIBDIR)'
    SHFLAGS='-shared'
    SLIBNAME='$(SLIBPREF)$(FULLNAME)$(SLIBSUF).$(LIBVERSION)'
    SLIBNAME_WITH_VERSION='$(SLIBNAME)'
    SLIBNAME_WITH_MAJOR='$(SLIBNAME)'
    oss_demuxer_extralibs="-lossaudio"
    oss_muxer_extralibs="-lossaudio"
    ;;
  freebsd)
    disable need_memalign
    ;;
  bsd/os)
    osextralibs="-lpoll -lgnugetopt"
    strip="strip -d"
    ;;
  darwin)
    disable need_memalign
    SHFLAGS='-dynamiclib -Wl,-single_module -Wl,-install_name,$(SHLIBDIR)/$(SLIBNAME),-current_version,$(SPPVERSION),-compatibility_version,$(SPPVERSION) -Wl,-read_only_relocs,suppress'
    VHOOKSHFLAGS='-dynamiclib -Wl,-single_module -flat_namespace -undefined suppress -Wl,-install_name,$(SHLIBDIR)/vhook/$@'
    strip="strip -x"
    FFLDFLAGS="-Wl,-dynamic,-search_paths_first"
    SLIBSUF=".dylib"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME).$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME).$(LIBMAJOR)$(SLIBSUF)'
    FFSERVERLDFLAGS=-Wl,-bind_at_load
    ;;
  mingw32*)
    targetos=mingw32
    shlibdir="$bindir"
    VHOOKSHFLAGS='-shared -L$(BUILD_ROOT)/libavformat -L$(BUILD_ROOT)/libavcodec -L$(BUILD_ROOT)/libavutil'
    VHOOKLIBS='-lavformat$(BUILDSUF) -lavcodec$(BUILDSUF) -lavutil$(BUILDSUF) $(EXTRALIBS)'
    if enabled swscaler; then
        VHOOKSHFLAGS="$VHOOKSHFLAGS -L\$(BUILD_ROOT)/libswscale"
        VHOOKLIBS="$VHOOKLIBS -lswscale\$(BUILDSUF)"
    fi
    disable ffserver
    SLIBPREF=""
    SLIBSUF=".dll"
    EXESUF=".exe"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
    SLIB_EXTRA_CMD='-lib /machine:i386 /def:$(@:$(SLIBSUF)=.def)'
    SLIB_INSTALL_EXTRA_CMD='-install -m 644 $(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib) "$(SHLIBDIR)/$(SLIBNAME:$(SLIBSUF)=.lib)"'
    SLIB_UNINSTALL_EXTRA_CMD='rm -f "$(SHLIBDIR)/$(SLIBNAME:$(SLIBSUF)=.lib)"'
    SHFLAGS='-shared -Wl,--output-def,$(@:$(SLIBSUF)=.def) -Wl,--enable-runtime-pseudo-reloc -Wl,--enable-auto-image-base'
    ;;
  cygwin*)
    targetos=cygwin
    shlibdir="$bindir"
    VHOOKSHFLAGS='-shared -L$(BUILD_ROOT)/libavformat -L$(BUILD_ROOT)/libavcodec -L$(BUILD_ROOT)/libavutil'
    VHOOKLIBS='-lavformat$(BUILDSUF) -lavcodec$(BUILDSUF) -lavutil$(BUILDSUF) $(EXTRALIBS)'
    if enabled swscaler; then
        VHOOKSHFLAGS="$VHOOKSHFLAGS -L\$(BUILD_ROOT)/libswscale"
        VHOOKLIBS="$VHOOKLIBS -lswscale\$(BUILDSUF)"
    fi
    EXESUF=".exe"
    SLIBPREF="cyg"
    SLIBSUF=".dll"
    SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME)-$(LIBVERSION)$(SLIBSUF)'
    SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
    SHFLAGS='-shared -Wl,--enable-auto-image-base'
    ;;
  linux)
    LDLATEFLAGS="-Wl,--as-needed $LDLATEFLAGS"
    enable dv1394
    ;;
  irix*)
    targetos=irix
    ranlib="echo ignoring ranlib"
    ;;
  *)
    targetos="${targetos}-UNKNOWN"
    ;;
esac

add_extralibs $osextralibs

if ! disabled logging ; then
    enabled logging || logfile="$logging"
    echo "# $0 $@" >$logfile
    set >>$logfile
else
    logfile=/dev/null
fi

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

test -n "$cross_prefix" && enable cross_compile
cc="${cross_prefix}${cc}"
ar="${cross_prefix}${ar}"
ranlib="${cross_prefix}${ranlib}"
strip="${cross_prefix}${strip}"

# 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 libogg; then
    enabled libtheora && die "libogg must be enabled to enable libtheora."
    enabled libvorbis && die "libogg must be enabled to enable libvorbis."
fi

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


if ! enabled gpl; then
    die_gpl_disabled(){
        name=$1
        shift
        enabled_any $@ && die "$name is under GPL and --enable-gpl is not specified."
    }
    die_gpl_disabled "The Postprocessing code" pp
    die_gpl_disabled "liba52"                  liba52
    die_gpl_disabled "libx264"                 libx264
    die_gpl_disabled "libxvidcore"             libxvid
    die_gpl_disabled "FAAD2"                   libfaad2
    die_gpl_disabled "The X11 grabber"         x11grab
    die_gpl_disabled "The software scaler"     swscaler
fi

check_deps $ARCH_EXT_LIST

test -z "$need_memalign" && need_memalign="$mmx"

#Darwin CC versions
if test $targetos = darwin; then
    if test -n "`$cc -v 2>&1 | grep xlc`"; then
        add_cflags "-qpdf2 -qlanglvl=extc99 -qmaxmem=-1 -qarch=auto -qtune=auto"
    else
        add_cflags "-no-cpp-precomp -pipe"
        check_cflags "-force_cpusubtype_ALL"
        check_cflags "-Wno-sign-compare"
        disabled shared && add_cflags -mdynamic-no-pic
    fi
fi

disabled optimizations || add_cflags -fomit-frame-pointer

# Add processor-specific flags
if test $cpu != "generic"; then
    warn_altivec(){
        $1 altivec && echo "WARNING: Tuning for $2 but AltiVec $1.";
    }
    case $cpu in
        601|ppc601|PowerPC601)
            add_cflags "-mcpu=601"
            warn_altivec enabled PPC601
        ;;
        603*|ppc603*|PowerPC603*)
            add_cflags "-mcpu=603"
            warn_altivec enabled PPC603
        ;;
        604*|ppc604*|PowerPC604*)
            add_cflags "-mcpu=604"
            warn_altivec enabled PPC604
        ;;
        G3|g3|75*|ppc75*|PowerPC75*)
            add_cflags "-mcpu=750 -mpowerpc-gfxopt"
            warn_altivec enabled PPC75x
        ;;
        G4|g4|745*|ppc745*|PowerPC745*)
            add_cflags "-mcpu=7450 -mpowerpc-gfxopt"
            warn_altivec disabled PPC745x
        ;;
        74*|ppc74*|PowerPC74*)
            add_cflags "-mcpu=7400 -mpowerpc-gfxopt"
            warn_altivec disabled PPC74xx
        ;;
        G5|g5|970|ppc970|PowerPC970|power4*|Power4*)
            add_cflags "-mcpu=970 -mpowerpc-gfxopt -mpowerpc64"
            warn_altivec disabled PPC970
            enable ppc64
        ;;
        Cell|CELL|cell)
            add_cflags "-mcpu=cell"
            warn_altivec disabled Cell
            enable ppc64
        ;;
        # targets that do NOT support conditional mov (cmov)
        i[345]86|pentium|pentium-mmx|k6|k6-[23]|winchip-c6|winchip2|c3)
            add_cflags "-march=$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)
            add_cflags "-march=$cpu"
            enable cmov
            enable fast_cmov
        ;;
        # targets that do support conditional mov but on which it's slow
        pentium4|prescott|nocona)
            add_cflags "-march=$cpu"
            enable cmov
            disable fast_cmov
        ;;
        sparc64)
            add_cflags "-mcpu=v9"
        ;;
        bf*) #bf531 bf532 bf533 bf561 bf5xx all get this config
            add_cflags "-mfdpic"
            add_ldflags "-mfdpic"
        ;;
        arm*)
            add_cflags "-mcpu=$cpu"
        ;;
        *)
        echo "WARNING: Unknown CPU \"$cpu\", ignored."
        ;;
    esac
fi

gnu_make(){
    $1 --version 2>&1 | grep -q GNU
}

if ! gnu_make $make; then
    gnu_make gmake && make=gmake || die "GNU make not found."
fi

# make sure we can execute files in $TMPDIR
cat >$TMPE 2>>$logfile <<EOF
#! /bin/sh
EOF
chmod +x $TMPE >>$logfile 2>&1
if ! $TMPE >>$logfile 2>&1; then
    cat <<EOF
Unable to create and execute files in $TMPDIR1.  Set the TMPDIR environment
variable to another directory and make sure that $TMPDIR1 is not mounted
noexec.
EOF
    die "Sanity test failed."
fi
rm $TMPE

# compiler sanity check
check_exec <<EOF
int main(){
    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 --cross-compile option."
        echo "Only do this if you know what cross compiling means."
    fi
    die "C compiler test failed."
fi

if 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 binutils is new enough to compile SSSE3
    enabled ssse3 && check_asm ssse3 '"pabsw %xmm0, %xmm0"'
fi

# check for assembler specific support

if test $arch = "powerpc"; then
check_cc <<EOF && enable dcbzl
int main(void) {
    register long zero = 0;
    char data[1024];
    asm volatile("dcbzl %0, %1" : : "b" (data), "r" (zero));
return 0;
}
EOF
fi

# check for SIMD availability

# AltiVec flags: The FSF version of GCC differs from the Apple version
if enabled altivec; then
    test -n "`$cc -v 2>&1 | grep version | grep Apple`" &&
        add_cflags "-faltivec" ||
        add_cflags "-maltivec -mabi=altivec"

    check_header altivec.h

    # check if our compiler supports Motorola AltiVec C API
    enabled altivec_h &&
        inc_altivec_h="#include <altivec.h>" ||
        inc_altivec_h=
    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
fi

enabled armv5te && check_asm armv5te '"qadd r0, r0, r0"'
enabled armv6   && check_asm armv6   '"sadd16 r0, r0, r0"'
enabled iwmmxt  && check_asm iwmmxt  '"wunpckelub wr6, wr4"'
enabled mmi     && check_asm mmi     '"lq $2, 0($2)"'
enabled vis     && check_asm vis     '"pdist %f0, %f0, %f0"' -mcpu=ultrasparc

enabled vis && add_cflags "-mcpu=ultrasparc -mtune=ultrasparc"

# ---
# big/little-endian test
check_cc <<EOF || die "endian test failed"
unsigned int endian = 'B' << 24 | 'I' << 16 | 'G' << 8 | 'E';
EOF
grep -q BIGE $TMPO && enable bigendian

# ---
# check availability of some header files

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

check_func fork
check_func gethrtime
check_func getrusage
check_func inet_aton
check_func memalign
check_func mkstemp
check_func2 windows.h GetProcessTimes

check_header byteswap.h
check_header conio.h
check_header dlfcn.h
check_header malloc.h
check_header termios.h

if ! enabled_any memalign memalign_hack && enabled need_memalign ; then
    die "Error, no memalign() but SSE enabled, disable it or use --enable-memalign-hack."
fi

enabled zlib && check_lib zlib.h zlibVersion -lz || disable zlib

# ffserver uses poll(),
# if it's not found we can emulate it using select().
if enabled ffserver; then
    check_header sys/poll.h
fi

# check for some common methods of building with pthread support
# do this before the optional library checks as some of them require pthreads
if enabled pthreads; then
    if check_func pthread_create; then
        :
    elif check_func pthread_create -pthread; then
        add_cflags -pthread
        add_ldflags -pthread
    elif check_func pthread_create -pthreads; then
        add_cflags -pthreads
        add_ldflags -pthreads
    elif ! check_lib pthread.h pthread_create -lpthread; then
        die "ERROR: can't find pthreads library"
    fi
fi

for thread in $THREADS_LIST; do
    if enabled $thread; then
        test -n "$thread_type" &&
            die "ERROR: Only one thread type must be selected." ||
            thread_type="$thread"
    fi
done

check_lib math.h sin -lm

# test for lrintf in math.h
check_exec <<EOF && enable lrintf || disable lrintf
#define _ISOC9X_SOURCE  1
#include <math.h>
int main( void ) { return (lrintf(3.999f) > 0)?0:1; }
EOF

enabled_any libamr_nb libamr_wb && enable libamr

# these are off by default, so fail if requested and not available
enabled avisynth   && require2 vfw32 "windows.h vfw.h" AVIFileInit -lvfw32
enabled liba52     && require liba52 a52dec/a52.h a52_init -la52
enabled libamr_nb  && require libamrnb amrnb/interf_dec.h Speech_Decode_Frame_init -lamrnb -lm
enabled libamr_wb  && require libamrwb amrwb/dec_if.h D_IF_init -lamrwb -lm
enabled libdc1394  && require libdc1394 libdc1394/dc1394_control.h dc1394_create_handle -ldc1394_control -lraw1394
enabled libfaac    && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
enabled libfaad    && require2 libfaad faad.h faacDecOpen -lfaad
enabled libgsm     && require libgsm gsm.h gsm_create -lgsm
enabled libmp3lame && require LAME lame/lame.h lame_init -lmp3lame -lm
enabled libnut     && require libnut libnut.h nut_demuxer_init -lnut
enabled libogg     && require libogg ogg/ogg.h ogg_sync_init -logg
enabled libtheora  && require libtheora theora/theora.h theora_info_init -ltheora -logg
enabled libvorbis  && require libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbis -lvorbisenc -logg
enabled libx264    && require x264 x264.h x264_encoder_open -lx264
enabled libxvid    && require Xvid xvid.h xvid_global -lxvidcore
enabled mlib       && require mediaLib mlib_types.h mlib_VectorSub_S16_U8_Mod -lmlib

# disable the native AC-3 decoder if liba52 is enabled
enabled liba52 && disable ac3_decoder

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

test "$vhook" = "default" && vhook="$dlopen"

if test "$targetos" = cygwin -o "$targetos" = mingw32 && enabled_all static vhook ; then
    disable vhook
    echo
    echo "At the moment vhooks don't work on Cygwin or MinGW static builds."
    echo "Patches welcome."
    echo
fi

if enabled vhook; then
    check_ldflags -rdynamic
    check_ldflags -export-dynamic
fi

check_foo_config imlib2 imlib2 Imlib2.h imlib_load_font
check_foo_config freetype2 freetype ft2build.h FT_Init_FreeType

##########################################
# SDL check

disable sdl_too_old
disable sdl
SDL_CONFIG="${cross_prefix}sdl-config"
if "${SDL_CONFIG}" --version >/dev/null 2>&1; then
    sdl_cflags=`"${SDL_CONFIG}" --cflags`
    temp_cflags $sdl_cflags
    temp_extralibs `"${SDL_CONFIG}" --libs`
    if check_lib SDL.h SDL_Init; then
        _sdlversion=`"${SDL_CONFIG}" --version | sed 's/[^0-9]//g'`
        if test "$_sdlversion" -lt 121 ; then
            enable sdl_too_old
        else
            enable sdl
            check_cc $sdl_cflags <<EOF && enable sdl_video_size
#include <SDL.h>
int main(void){
    const SDL_VideoInfo *vi = SDL_GetVideoInfo();
    int w = vi->current_w;
    return 0;
}
EOF
        fi
    fi
    restore_flags
fi

texi2html -version >/dev/null 2>&1 && enable texi2html || disable texi2html

##########################################
# Network check

if enabled network; then
    # Prefer arpa/inet.h over winsock2
    if check_header arpa/inet.h ; then
        check_func closesocket
    elif check_header winsock2.h ; then
        network_extralibs="-lws2_32"
        check_func2 winsock2.h closesocket
    fi
fi

##########################################
# IPv6 check

enabled network && enabled ipv6 && check_ld <<EOF && enable ipv6 || disable ipv6
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
int main( void ) {
  struct sockaddr_storage saddr;
  struct ipv6_mreq mreq6;
  getaddrinfo(0,0,0,0);
  getnameinfo(0,0,0,0,0,0,0);
  IN6_IS_ADDR_MULTICAST((const struct in6_addr *)0);
}
EOF

check_header linux/videodev.h
check_header linux/videodev2.h

# check for ioctl_meteor.h, ioctl_bt848.h and alternatives
{ check_header dev/bktr/ioctl_meteor.h &&
  check_header dev/bktr/ioctl_bt848.h; } ||
{ check_header machine/ioctl_meteor.h &&
  check_header machine/ioctl_bt848.h; } ||
{ check_header dev/video/meteor/ioctl_meteor.h &&
  check_header dev/video/bktr/ioctl_bt848.h; } ||
check_header dev/ic/bt8xx.h

check_header sys/soundcard.h
check_header soundcard.h

# Deal with the x11 frame grabber
enabled x11grab                         &&
check_header X11/Xlib.h                 &&
check_header X11/extensions/XShm.h      &&
check_func XOpenDisplay -lX11           &&
check_func XShmCreateImage -lX11 -lXext

enabled debug && add_cflags -g

# add some useful compiler flags if supported
check_cflags -Wdeclaration-after-statement
check_cflags -Wall
check_cflags -Wno-switch
check_cflags -Wdisabled-optimization
check_cflags -Wpointer-arith
check_cflags -Wredundant-decls
check_cflags -Wno-pointer-sign
enabled extra_warnings && check_cflags -Winline

# add some linker flags
check_ldflags -Wl,--warn-common
check_ldflags $LDLATEFLAGS

if enabled small; then
    check_cflags -Os            # not all compilers support -Os
    optimizations="small"
elif enabled optimizations; then
    if test -n "`$cc -v 2>&1 | grep xlc`"; then
        add_cflags  "-O5"
        add_ldflags "-O5"
    else
        add_cflags "-O3"
    fi
fi

# PIC flags for shared library objects where they are needed
if enabled shared; then
    # LIBOBJFLAGS may have already been set in the OS configuration
    if test -z "$LIBOBJFLAGS" ; then
        case "$arch" in
            x86_64|ia64|alpha|sparc*|power*) LIBOBJFLAGS='$(PIC)' ;;
        esac
    fi
fi

if enabled gprof; then
    add_cflags  "-p"
    add_ldflags "-p"
fi

VHOOKCFLAGS="-fPIC"

# Find out if the .align argument is a power of two or not.
if test $asmalign_pot = "unknown"; then
    disable asmalign_pot
    echo 'asm (".align 3");' | check_cc && enable asmalign_pot
fi

enabled_any $ENCODER_LIST  && enable encoders
enabled_any $DECODER_LIST  && enable decoders
enabled_any $MUXER_LIST    && enable muxers
enabled_any $DEMUXER_LIST  && enable demuxers
enabled_any $PROTOCOL_LIST && enable protocols
enabled_any $BSF_LIST      && enable bsfs

enabled_any $THREADS_LIST  && enable threads

check_deps $CONFIG_LIST $HAVE_LIST $DECODER_LIST $ENCODER_LIST $PARSER_LIST \
    $BSF_LIST $DEMUXER_LIST $MUXER_LIST $PROTOCOL_LIST

enabled libdc1394 && append pkg_requires "libraw1394"
enabled libogg    && append pkg_requires "ogg >= 1.1"
enabled libtheora && append pkg_requires "theora"
enabled libvorbis && append pkg_requires "vorbis vorbisenc"

echo "install prefix            $PREFIX"
echo "source path               $source_path"
echo "C compiler                $cc"
echo "make                      $make"
echo ".align is power-of-two    $asmalign_pot"
echo "ARCH                      $arch ($cpu)"
if test "$BUILDSUF" != ""; then
    echo "build suffix              $BUILDSUF"
fi
echo "big-endian                ${bigendian-no}"
if test $arch = "x86_32" -o $arch = "x86_64"; then
    echo "MMX enabled               ${mmx-no}"
    echo "CMOV enabled              ${cmov-no}"
    echo "CMOV is fast              ${fast_cmov-no}"
    echo "EBX available             ${ebx_available-no}"
    echo "EBP available             ${ebp_available-no}"
fi
if test $arch = "armv4l"; then
    echo "ARMv5TE enabled           ${armv5te-no}"
    echo "ARMv6 enabled             ${armv6-no}"
    echo "IWMMXT enabled            ${iwmmxt-no}"
fi
if test $arch = "mips"; then
    echo "MMI enabled               ${mmi-no}"
fi
if test $arch = "powerpc"; then
    echo "AltiVec enabled           ${altivec-no}"
    echo "dcbzl available           ${dcbzl-no}"
fi
echo "gprof enabled             ${gprof-no}"
echo "debug symbols             ${debug-no}"
echo "strip symbols             ${dostrip-no}"
echo "optimizations             ${optimizations-no}"
echo "static                    ${static-no}"
echo "shared                    ${shared-no}"
echo "postprocessing support    ${pp-no}"
echo "software scaler enabled   ${swscaler-no}"
echo "video hooking             ${vhook-no}"
if enabled vhook; then
    echo "Imlib2 support            ${imlib2-no}"
    echo "FreeType support          ${freetype2-no}"
fi
echo "network support           ${network-no}"
if enabled network; then
    echo "IPv6 support              ${ipv6-no}"
fi
echo "threading support         ${thread_type-no}"
echo "SDL support               ${sdl-no}"
if enabled sdl_too_old; then
    echo "-> Your SDL version is too old - please upgrade to have FFplay/SDL support."
fi
echo "Sun medialib support      ${mlib-no}"
echo "AVISynth enabled          ${avisynth-no}"
echo "liba52 support            ${liba52-no}"
echo "liba52 dlopened           ${liba52bin-no}"
echo "libamr-nb support         ${libamr_nb-no}"
echo "libamr-wb support         ${libamr_wb-no}"
echo "libdc1394 support         ${libdc1394-no}"
echo "libfaac enabled           ${libfaac-no}"
echo "libfaad enabled           ${libfaad-no}"
echo "libfaad dlopened          ${libfaadbin-no}"
echo "libgsm enabled            ${libgsm-no}"
echo "libmp3lame enabled        ${libmp3lame-no}"
echo "libnut enabled            ${libnut-no}"
echo "libogg enabled            ${libogg-no}"
echo "libtheora enabled         ${libtheora-no}"
echo "libvorbis enabled         ${libvorbis-no}"
echo "x264 enabled              ${libx264-no}"
echo "XviD enabled              ${libxvid-no}"
echo "zlib enabled              ${zlib-no}"
enabled gpl &&
    echo "License: GPL" ||
    echo "License: LGPL"

echo "Creating config.mak and config.h..."

echo "# Automatically generated by configure - do not modify!" > config.mak
echo "/* Automatically generated by configure - do not modify! */" > $TMPH
echo "#ifndef FFMPEG_CONFIG_H" >> $TMPH
echo "#define FFMPEG_CONFIG_H" >> $TMPH
echo "#define FFMPEG_CONFIGURATION \"$FFMPEG_CONFIGURATION\"" >> $TMPH

echo "PREFIX=$PREFIX" >> config.mak
echo "prefix=\$(DESTDIR)\$(PREFIX)" >> config.mak
echo "LIBDIR=\$(DESTDIR)$libdir" >> config.mak
echo "SHLIBDIR=\$(DESTDIR)$shlibdir" >> config.mak
echo "INCDIR=\$(DESTDIR)$incdir" >> config.mak
echo "BINDIR=\$(DESTDIR)$bindir" >> config.mak
echo "MANDIR=\$(DESTDIR)$mandir" >> config.mak
echo "MAKE=$make" >> config.mak
echo "CC=$cc" >> config.mak
echo "AR=$ar" >> config.mak
echo "RANLIB=$ranlib" >> config.mak
echo "LDCONFIG=$LDCONFIG" >> config.mak
echo "LN_S=$ln_s" >> config.mak
enabled dostrip &&
    echo "STRIP=$strip" >> config.mak ||
    echo "STRIP=echo ignoring strip" >> config.mak

echo "OPTFLAGS=$CFLAGS" >> config.mak
echo "VHOOKCFLAGS=$VHOOKCFLAGS">>config.mak
echo "LDFLAGS=$LDFLAGS" >> config.mak
echo "FFSERVERLDFLAGS=$FFSERVERLDFLAGS" >> config.mak
echo "SHFLAGS=$SHFLAGS" >> config.mak
echo "VHOOKSHFLAGS=$VHOOKSHFLAGS" >> config.mak
echo "VHOOKLIBS=$VHOOKLIBS" >> config.mak
echo "LIBOBJFLAGS=$LIBOBJFLAGS" >> config.mak
echo "BUILD_STATIC=$static" >> config.mak
echo "BUILDSUF=$BUILDSUF" >> config.mak
echo "FULLNAME=$FULLNAME" >> config.mak
echo "LIBPREF=$LIBPREF" >> config.mak
echo "LIBSUF=$LIBSUF" >> config.mak
echo "LIBNAME=$LIBNAME" >> config.mak
echo "SLIBPREF=$SLIBPREF" >> config.mak
echo "SLIBSUF=$SLIBSUF" >> config.mak
echo "EXESUF=$EXESUF" >> config.mak

if enabled bigendian; then
  echo "WORDS_BIGENDIAN=yes" >> config.mak
  echo "#define WORDS_BIGENDIAN 1" >> $TMPH
fi
if enabled mmx; then
  echo "#define __CPU__ 586" >> $TMPH
fi

if enabled sdl; then
  echo "SDL_LIBS=`"${SDL_CONFIG}" --libs`" >> config.mak
  echo "SDL_CFLAGS=`"${SDL_CONFIG}" --cflags`" >> config.mak
fi
if enabled texi2html; then
  echo "BUILD_DOC=yes" >> config.mak
fi

sws_version=`grep '#define LIBSWSCALE_VERSION ' "$source_path/libswscale/swscale.h" | sed 's/[^0-9\.]//g'`
pp_version=`grep '#define LIBPOSTPROC_VERSION ' "$source_path/libpostproc/postprocess.h" | sed 's/[^0-9\.]//g'`
lavc_version=`grep '#define LIBAVCODEC_VERSION ' "$source_path/libavcodec/avcodec.h" | sed 's/[^0-9\.]//g'`
lavf_version=`grep '#define LIBAVFORMAT_VERSION ' "$source_path/libavformat/avformat.h" | sed 's/[^0-9\.]//g'`
lavu_version=`grep '#define LIBAVUTIL_VERSION ' "$source_path/libavutil/avutil.h" | sed 's/[^0-9\.]//g'`



if enabled shared; then
  echo "BUILD_SHARED=yes" >> config.mak
  echo "PIC=-fPIC -DPIC" >> config.mak
  echo "SPPMAJOR=${pp_version%%.*}" >> config.mak
  echo "SPPVERSION=$pp_version" >> config.mak
  echo "LAVCMAJOR=${lavc_version%%.*}" >> config.mak
  echo "LAVCVERSION=$lavc_version" >> config.mak
  echo "LAVFMAJOR=${lavf_version%%.*}" >> config.mak
  echo "LAVFVERSION=$lavf_version" >> config.mak
  echo "LAVUMAJOR=${lavu_version%%.*}" >> config.mak
  echo "LAVUVERSION=$lavu_version" >> config.mak
  echo "SWSMAJOR=${sws_version%%.*}" >> config.mak
  echo "SWSVERSION=$sws_version" >> config.mak
  echo "SLIBNAME=${SLIBNAME}" >> config.mak
  echo "SLIBNAME_WITH_VERSION=${SLIBNAME_WITH_VERSION}" >> config.mak
  echo "SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}" >> config.mak
  echo "SLIB_EXTRA_CMD=${SLIB_EXTRA_CMD}" >> config.mak
  echo "SLIB_INSTALL_EXTRA_CMD=${SLIB_INSTALL_EXTRA_CMD}" >> config.mak
  echo "SLIB_UNINSTALL_EXTRA_CMD=${SLIB_UNINSTALL_EXTRA_CMD}" >> config.mak
fi
echo "LIB_INSTALL_EXTRA_CMD=${LIB_INSTALL_EXTRA_CMD}" >> config.mak
echo "EXTRALIBS=$extralibs" >> config.mak

print_config ARCH_   $TMPH config.mak $ARCH_LIST
print_config HAVE_   $TMPH config.mak $HAVE_LIST
print_config CONFIG_ $TMPH config.mak $CONFIG_LIST   \
                                      $DECODER_LIST  \
                                      $ENCODER_LIST  \
                                      $PARSER_LIST   \
                                      $BSF_LIST      \
                                      $DEMUXER_LIST  \
                                      $MUXER_LIST    \
                                      $PROTOCOL_LIST \

echo "#define restrict $_restrict" >> $TMPH

if enabled small; then
  echo "#define av_always_inline"  >> $TMPH
fi

echo "SRC_PATH=\"$source_path\"" >> config.mak
echo "SRC_PATH_BARE=$source_path" >> config.mak
echo "BUILD_ROOT=\"$PWD\"" >> config.mak

# Apparently it's not possible to portably echo a backslash.
enabled asmalign_pot &&
  printf '#define ASMALIGN(ZEROBITS) ".align " #ZEROBITS "\\n\\t"\n' >> $TMPH ||
  printf '#define ASMALIGN(ZEROBITS) ".align 1<<" #ZEROBITS "\\n\\t"\n' >> $TMPH


echo "#endif /* FFMPEG_CONFIG_H */" >> $TMPH

# Do not overwrite config.h if unchanged to avoid superfluous rebuilds.
cmp -s $TMPH config.h &&
    echo "config.h is unchanged" ||
    mv -f $TMPH config.h

rm -f $TMPO $TMPC $TMPE $TMPS $TMPH

# build tree in object directory if source path is different from current one
if enabled source_path_used; then
    DIRS="\
         doc \
         libavcodec \
         libavcodec/alpha \
         libavcodec/armv4l \
         libavcodec/bfin \
         libavcodec/i386 \
         libavcodec/mlib \
         libavcodec/ppc \
         libavcodec/sh4 \
         libavcodec/sparc \
         libavformat \
         libavutil \
         libpostproc \
         libswscale \
         tests \
         tools \
         vhook \
         "
    FILES="\
          Makefile \
          common.mak \
          doc/texi2pod.pl \
          libavcodec/Makefile \
          libavformat/Makefile \
          libavutil/Makefile \
          libpostproc/Makefile \
          libswscale/Makefile \
          "
    for dir in $DIRS ; do
            mkdir -p $dir
    done
    for f in $FILES ; do
        $ln_s "$source_path/$f" $f
    done
fi


# build pkg-config files
# FIXME: libdir and includedir are hardcoded and may differ from the real path.

pkgconfig_generate(){
name=$1