configure

    speed_cflags='-O3'
    size_cflags='-Os'
elif $cc -V 2>&1 | grep -q Sun; then
    cc_type=suncc
    cc_version="AV_STRINGIFY(__SUNPRO_C)"
    cc_ident=$($cc -V 2>&1 | head -n1 | cut -d' ' -f 2-)
    DEPEND_CMD='$(DEPCC) $(DEPFLAGS) $< | sed -e "1s,^.*: ,$@: ," -e "\$$!s,\$$, \\\," -e "1!s,^.*: , ," > $(@:.o=.d)'
    DEPFLAGS='$(CPPFLAGS) $(CFLAGS) -xM1'
    speed_cflags='-O5'
    size_cflags='-O5 -xspace'
    filter_cflags=suncc_flags
    suncc_flags(){
        for flag; do
            case $flag in
                -march=*|-mcpu=*)
                    case "${flag#*=}" in
                        native)                   echo -xtarget=native       ;;
                        v9|niagara)               echo -xarch=sparc          ;;
                        ultrasparc)               echo -xarch=sparcvis       ;;
                        ultrasparc3|niagara2)     echo -xarch=sparcvis2      ;;
                        i586|pentium)             echo -xchip=pentium        ;;
                        i686|pentiumpro|pentium2) echo -xtarget=pentium_pro  ;;
                        pentium3*|c3-2)           echo -xtarget=pentium3     ;;
                        pentium-m)          echo -xarch=sse2 -xchip=pentium3 ;;
                        pentium4*)          echo -xtarget=pentium4           ;;
                        prescott|nocona)    echo -xarch=sse3 -xchip=pentium4 ;;
                        *-sse3)             echo -xarch=sse3                 ;;
                        core2)              echo -xarch=ssse3 -xchip=core2   ;;
                        amdfam10|barcelona)       echo -xarch=sse4_1         ;;
                        athlon-4|athlon-[mx]p)    echo -xarch=ssea           ;;
                        k8|opteron|athlon64|athlon-fx)
                                                  echo -xarch=sse2a          ;;
                        athlon*)                  echo -xarch=pentium_proa   ;;
                    esac
                    ;;
                -std=c99)             echo -xc99              ;;
                -fomit-frame-pointer) echo -xregs=frameptr    ;;
                -fPIC)                echo -KPIC -xcode=pic32 ;;
                -W*,*)                echo $flag              ;;
                -f*-*|-W*)                                    ;;
                *)                    echo $flag              ;;
            esac
        done
    }
elif $cc -v 2>&1 | grep -q 'PathScale\|Path64'; then
    cc_type=pathscale
    cc_version=__PATHSCALE__
    cc_ident=$($cc -v 2>&1 | head -n1 | tr -d :)
    CC_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
    AS_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
    speed_cflags='-O2'
    size_cflags='-Os'
elif $cc -v 2>&1 | grep -q Open64; then
    cc_type=open64
    cc_version=__OPEN64__
    cc_ident=$($cc -v 2>&1 | head -n1 | tr -d :)
    CC_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
    AS_DEPFLAGS='-MMD -MF $(@:.o=.d) -MT $@'
    speed_cflags='-O2'
    size_cflags='-Os'
fi

test -n "$cc_type" && enable $cc_type ||
    warn "Unknown C compiler $cc, unable to select optimal CFLAGS"

: ${as_default:=$cc}
: ${dep_cc_default:=$cc}
: ${ld_default:=$cc}
set_default ar 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|llvm_gcc|clang)
            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|llvm_gcc)
            check_native(){
                $cc $1=native -v -c -o $TMPO $TMPC >$TMPE 2>&1 || return
                sed -n "/$1=/{
                            s/.*$1=\\([^ ]*\\).*/\\1/
                            p
                            q
                        }" $TMPE
            }
            cpu=$(check_native -march || check_native -mcpu)
        ;;
    esac

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

# Deal with common $arch aliases
case "$arch" in
    arm*)
        arch="arm"
    ;;
    mips|mipsel|IP*)
        arch="mips"
    ;;
    mips64*)
        arch="mips"
        subarch="mips64"
    ;;
    parisc|hppa)
        arch="parisc"
    ;;
    parisc64|hppa64)
        arch="parisc"
        subarch="parisc64"
    ;;
    "Power Macintosh"|ppc|powerpc)
        arch="ppc"
    ;;
    ppc64|powerpc64)
        arch="ppc"
        subarch="ppc64"
    ;;
    s390|s390x)
        arch="s390"
    ;;
    sh4|sh)
        arch="sh4"
    ;;
    sun4u|sparc64)
        arch="sparc"
        subarch="sparc64"
    ;;
    i[3-6]86|i86pc|BePC|x86pc|x86_64|amd64)
        arch="x86"
    ;;
esac

is_in $arch $ARCH_LIST || warn "unknown architecture $arch"
enable $arch

# Add processor-specific flags
if test "$cpu" = generic; then
    : do nothing
elif enabled ppc; then

    case $(tolower $cpu) in
        601|ppc601|powerpc601)
            cpuflags="-mcpu=601"
            disable altivec
        ;;
        603*|ppc603*|powerpc603*)
            cpuflags="-mcpu=603"
            disable altivec
        ;;
        604*|ppc604*|powerpc604*)
            cpuflags="-mcpu=604"
            disable altivec
        ;;
        g3|75*|ppc75*|powerpc75*)
            cpuflags="-mcpu=750 -mpowerpc-gfxopt"
            disable altivec
        ;;
        g4|745*|ppc745*|powerpc745*)
            cpuflags="-mcpu=7450 -mpowerpc-gfxopt"
        ;;
        74*|ppc74*|powerpc74*)
            cpuflags="-mcpu=7400 -mpowerpc-gfxopt"
        ;;
        g5|970|ppc970|powerpc970|power4*)
            cpuflags="-mcpu=970 -mpowerpc-gfxopt -mpowerpc64"
        ;;
        cell)
            cpuflags="-mcpu=cell"
            enable ldbrx
        ;;
        e500v2)
            cpuflags="-mcpu=8548 -mhard-float -mfloat-gprs=double"
            disable altivec
        ;;
        e500)
            cpuflags="-mcpu=8540 -mhard-float"
            disable altivec
        ;;
    esac

elif enabled x86; then

    case $cpu in
        i[345]86|pentium)
            cpuflags="-march=$cpu"
            disable mmx
        ;;
        # targets that do NOT support conditional mov (cmov)
        pentium-mmx|k6|k6-[23]|winchip-c6|winchip2|c3)
            cpuflags="-march=$cpu"
            disable cmov
        ;;
        # targets that do support conditional mov (cmov)
        i686|pentiumpro|pentium[23]|pentium-m|athlon|athlon-tbird|athlon-4|athlon-[mx]p|athlon64|k8|opteron|athlon-fx|core2|amdfam10|barcelona|atom)
            cpuflags="-march=$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
        ;;
    esac

elif enabled sparc; then

    case $cpu in
        niagara)
            cpuflags="-mcpu=$cpu"
            disable vis
        ;;
        sparc64)
            cpuflags="-mcpu=v9"
        ;;
    esac

elif enabled arm; then

    case $cpu in
        armv*)
            cpuflags="-march=$cpu"
            subarch=$(echo $cpu | sed 's/[^a-z0-9]//g')
        ;;
        *)
            cpuflags="-mcpu=$cpu"
            case $cpu in
                cortex-a*)                               subarch=armv7a  ;;
                cortex-r*)                               subarch=armv7r  ;;
                cortex-m*)                               subarch=armv7m  ;;
                arm11*)                                  subarch=armv6   ;;
                arm[79]*e*|arm9[24]6*|arm96*|arm102[26]) subarch=armv5te ;;
                armv4*|arm7*|arm9[24]*)                  subarch=armv4   ;;
            esac
        ;;
    esac

elif enabled alpha; then

    enabled ccc && cpuflags="-arch $cpu" || cpuflags="-mcpu=$cpu"

elif enabled bfin; then

    cpuflags="-mcpu=$cpu"

elif enabled mips; then

    cpuflags="-march=$cpu"

elif enabled avr32; then

    case $cpu in
        ap7[02]0[0-2])
            subarch="avr32_ap"
            cpuflags="-mpart=$cpu"
        ;;
        ap)
            subarch="avr32_ap"
            cpuflags="-march=$cpu"
        ;;
        uc3[ab]*)
            subarch="avr32_uc"
            cpuflags="-mcpu=$cpu"
        ;;
        uc)
            subarch="avr32_uc"
            cpuflags="-march=$cpu"
        ;;
    esac

fi

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

check_host_cflags -std=c99

case "$arch" in
    alpha|ia64|mips|parisc|sparc)
        spic=$shared
    ;;
    x86)
        subarch="x86_32"
        check_cc <<EOF && subarch="x86_64"
        int test[(int)sizeof(char*) - 7];
EOF
        if test "$subarch" = "x86_64"; then
            spic=$shared
        fi
    ;;
esac

enable $subarch
enabled spic && enable pic

# OS specific
case $target_os in
    haiku)
        prefix_default="/boot/common"
        network_extralibs="-lnetwork"
        host_libs=
        ;;
    sunos)
        FFSERVERLDFLAGS=""
        SHFLAGS='-shared -Wl,-h,$$(@F)'
        enabled x86 && SHFLAGS="-mimpure-text $SHFLAGS"
        network_extralibs="-lsocket -lnsl"
        add_cppflags -D__EXTENSIONS__
        nm_opts='-P -g'
        ;;
    netbsd)
        disable symver
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        add_cppflags -D_XOPEN_SOURCE=600
        ;;
    openbsd)
        enable malloc_aligned
        # On OpenBSD 4.5. the compiler does not use PIC unless
        # explicitly using -fPIC. Libav builds fine without PIC,
        # however the generated executable will not do anything
        # (simply quits with exit-code 1, no crash, no output).
        # Thus explicitly enable PIC here.
        enable pic
        disable symver
        SHFLAGS='-shared'
        oss_indev_extralibs="-lossaudio"
        oss_outdev_extralibs="-lossaudio"
        ;;
    dragonfly)
        enable malloc_aligned
        disable symver
        ;;
    freebsd)
        enable malloc_aligned
        ;;
    bsd/os)
        add_extralibs -lpoll -lgnugetopt
        strip="strip -d"
        ;;
    darwin)
        enable malloc_aligned
        gas="gas-preprocessor.pl $cc"
        enabled ppc && add_asflags -force_cpusubtype_ALL
        SHFLAGS='-dynamiclib -Wl,-single_module -Wl,-install_name,$(SHLIBDIR)/$(SLIBNAME),-current_version,$(LIBVERSION),-compatibility_version,$(LIBMAJOR)'
        enabled x86_32 && append SHFLAGS -Wl,-read_only_relocs,suppress
        strip="${strip} -x"
        add_ldflags -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_any pic 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="i386:x86-64"
        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=-'$(DLLTOOL) -m $(LIBTARGET) -d $$(@:$(SLIBSUF)=.def) -l $(SUBDIR)$(SLIBNAME_WITH_MAJOR:$(SLIBSUF)=.lib) -D $(SLIBNAME_WITH_MAJOR)'
        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"
        dlltool="${cross_prefix}dlltool"
        enable dos_paths
        check_cflags -fno-common
        check_cpp_condition _mingw.h "defined (__MINGW64_VERSION_MAJOR) || (__MINGW32_MAJOR_VERSION > 3) \
                                      || (__MINGW32_MAJOR_VERSION == 3 && __MINGW32_MINOR_VERSION >= 15)" ||
                die "ERROR: MinGW runtime version must be >= 3.15."
        ;;
    cygwin*)
        target_os=cygwin
        shlibdir_default="$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 $OUTDEV_LIST
        network_extralibs="-lsocket"
        objformat="coff"
        enable dos_paths
        ;;
    linux)
        enable dv1394
        ;;
    irix*)
        target_os=irix
        ranlib="echo ignoring ranlib"
        ;;
    os/2*)
        strip="lxlite -CS"
        ln_s="cp -f"
        add_ldflags -Zomf -Zbin-files -Zargs-wild -Zmap
        SHFLAGS='$(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)
        ;;
    qnx)
        add_cppflags -D_QNX_SOURCE
        network_extralibs="-lsocket"
        ;;
    none)
        ;;
    *)
        die "Unknown OS '$target_os'."
        ;;
esac

echo "config:$arch:$subarch:$cpu:$target_os:$cc_ident:$LIBAV_CONFIGURATION" >config.fate

check_cpp_condition stdlib.h "defined(__PIC__) || defined(__pic__) || defined(PIC)" && enable pic

set_default $PATHS_LIST

# 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=""

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

die_license_disabled gpl libx264
die_license_disabled gpl libxavs
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; }

disabled optimizations || check_cflags -fomit-frame-pointer

enable_pic() {
    enable pic
    add_cppflags -DPIC
    add_cflags   -fPIC
    add_asflags  -fPIC
}

enabled pic && enable_pic

check_cc <<EOF || die "Symbol mangling check failed."
int ff_extern;
EOF
sym=$($nm $nm_opts $TMPO | awk '/ff_extern/{ print substr($0, match($0, /[^ \t]*ff_extern/)) }')
extern_prefix=${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 && enable attribute_may_alias
union { int x; } __attribute__((may_alias)) x;
EOF

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

if enabled alpha; then

    check_cflags -mieee

elif enabled arm; then

    check_cflags -marm
    nogas=die

    if     check_cpp_condition stddef.h "defined __ARM_PCS_VFP"; then
        enable vfp_args
    elif ! check_cpp_condition stddef.h "defined __ARM_PCS || defined __SOFTFP__"; then
        case "${cross_prefix:-$cc}" in
            *hardfloat*)         enable vfp_args;   fpabi=vfp ;;
            *) check_ld <<EOF && enable vfp_args && fpabi=vfp || fpabi=soft ;;
__asm__ (".eabi_attribute 28, 1");
int main(void) { return 0; }
EOF
        esac
        warn "Compiler does not indicate floating-point ABI, guessing $fpabi."
    fi

    # 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"'

    enabled_all armv6t2 shared !pic && enable_pic

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

    enable local_aligned_8 local_aligned_16

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

    # AltiVec flags: The FSF version of GCC differs from the Apple version
    if enabled altivec; then
        nogas=warn
        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

    enable local_aligned_8 local_aligned_16

    # 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 whether EBX is available on x86
    check_asm ebx_available '""::"b"(0)' &&
        check_asm ebx_available '"":::"%ebx"'

    # check whether xmm clobbers are supported
    check_asm xmm_clobbers '"":::"%xmm0"'

    # 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"'

    if ! disabled_any asm mmx yasm; then
        if check_cmd $yasmexe --version; then
            enabled x86_64 && yasm_extra="-m amd64"
            yasm_debug="-g dwarf2"
        elif check_cmd nasm -v; then
            yasmexe=nasm
            yasm_debug="-g -F dwarf"
            enabled x86_64 && test "$objformat" = elf && objformat=elf64
        fi

        YASMFLAGS="-f $objformat $yasm_extra"
        enabled pic               && append YASMFLAGS "-DPIC"
        test -n "$extern_prefix"  && append YASMFLAGS "-DPREFIX"
        case "$objformat" in
            elf*) enabled debug && append YASMFLAGS $yasm_debug ;;
        esac

        check_yasm "pextrd [eax], xmm0, 1" && enable yasm ||
            die "yasm not found, use --disable-yasm for a crippled build"
        check_yasm "vpaddw xmm0, xmm0, xmm0" || disable avx
    fi

    case "$cpu" in
        athlon*|opteron*|k8*|pentium|pentium-mmx|prescott|nocona|atom|geode)
            disable fast_clz
        ;;
    esac

fi

if enabled asm; then
    as=${gas:=$as}
    check_asm gnu_as '".macro m n\n\\n:.int 0\n.endm\nm x"' ||
        $nogas "GNU assembler not found, install gas-preprocessor"
fi

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

if enabled network; then
    check_type "sys/types.h sys/socket.h" socklen_t
    check_type netdb.h "struct addrinfo"
    check_type netinet/in.h "struct ipv6_mreq" -D_DARWIN_C_SOURCE
    check_type netinet/in.h "struct sockaddr_in6"
    check_type "sys/types.h sys/socket.h" "struct sockaddr_storage"
    check_struct "sys/types.h sys/socket.h" "struct sockaddr" sa_len
    # Prefer arpa/inet.h over winsock2
    if check_header arpa/inet.h ; then
        check_func closesocket
    elif check_header winsock2.h ; then
        check_func_headers winsock2.h closesocket -lws2 && \
            network_extralibs="-lws2" || \
        { check_func_headers winsock2.h closesocket -lws2_32 && \
            network_extralibs="-lws2_32"; }
        check_type ws2tcpip.h socklen_t
        check_type ws2tcpip.h "struct addrinfo"
        check_type ws2tcpip.h "struct ipv6_mreq"
        check_type ws2tcpip.h "struct sockaddr_in6"
        check_type ws2tcpip.h "struct sockaddr_storage"
        check_struct winsock2.h "struct sockaddr" sa_len
    else
        disable network
    fi
fi

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

check_func  fcntl
check_func  fork
check_func  getaddrinfo $network_extralibs
check_func  gethrtime
check_func  getrusage
check_struct "sys/time.h sys/resource.h" "struct rusage" ru_maxrss
check_func  inet_aton $network_extralibs
check_func  isatty
check_func  ${malloc_prefix}memalign            && enable memalign
check_func  mkstemp
check_func  mmap
check_func  ${malloc_prefix}posix_memalign      && enable posix_memalign
check_func  setrlimit
check_func  strerror_r
check_func  strtok_r
check_func_headers conio.h kbhit
check_func_headers io.h setmode
check_func_headers lzo/lzo1x.h lzo1x_999_compress
check_lib2 "windows.h psapi.h" GetProcessMemoryInfo -lpsapi
check_func_headers windows.h GetProcessTimes
check_func_headers windows.h MapViewOfFile
check_func_headers windows.h VirtualAlloc

check_header dlfcn.h
check_header dxva2api.h
check_header malloc.h
check_header poll.h
check_header sys/mman.h
check_header sys/resource.h
check_header sys/select.h
check_header vdpau/vdpau.h
check_header vdpau/vdpau_x11.h
check_header X11/extensions/XvMClib.h

check_struct dxva2api.h DXVA_PictureParameters wDecodedPictureIndex

if ! enabled_any memalign memalign_hack posix_memalign malloc_aligned &&
     enabled_any $need_memalign ; then
    die "Error, no aligned memory allocator but SSE enabled, disable it or use --enable-memalign-hack."
fi

disabled  zlib || check_lib   zlib.h      zlibVersion -lz   || disable  zlib
disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib

# check for some common methods of building with pthread support
# do this before the optional library checks as some of them require pthreads
if ! disabled pthreads && ! enabled w32threads; then
    enable pthreads
    if check_func pthread_create; then
        :
    elif check_func pthread_create -pthread; then
        add_cflags -pthread
        add_extralibs -pthread
    elif check_func pthread_create -pthreads; then
        add_cflags -pthreads
        add_extralibs -pthreads
    elif check_func pthread_create -lpthreadGC2; then
        add_extralibs -lpthreadGC2
    elif ! check_lib pthread.h pthread_create -lpthread; then
        disable pthreads
    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
disabled vaapi || check_lib va/va.h vaInitialize -lva

check_mathfunc exp2
check_mathfunc exp2f
check_mathfunc llrint
check_mathfunc llrintf
check_mathfunc log2
check_mathfunc log2f
check_mathfunc lrint
check_mathfunc lrintf
check_mathfunc round
check_mathfunc roundf
check_mathfunc truncf

# these are off by default, so fail if requested and not available
enabled avisynth   && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
enabled frei0r     && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }
enabled libdirac   && require_pkg_config dirac                          \
    "libdirac_decoder/dirac_parser.h libdirac_encoder/dirac_encoder.h"  \
    "dirac_decoder_init dirac_encoder_init"
enabled libfaac    && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
enabled libgsm     && require  libgsm gsm/gsm.h gsm_create -lgsm
enabled libmp3lame && require  "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame
enabled libnut     && require  libnut libnut.h nut_demuxer_init -lnut
enabled libopencore_amrnb  && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb
enabled libopencore_amrwb  && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb
enabled libopencv  && require_pkg_config opencv opencv/cv.h cvCreateImageHeader
enabled libopenjpeg && require libopenjpeg openjpeg.h opj_version -lopenjpeg
enabled librtmp    && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
enabled libschroedinger && require_pkg_config schroedinger-1.0 schroedinger/schro.h schro_init
enabled libspeex   && require  libspeex speex/speex.h speex_decoder_init -lspeex
enabled libtheora  && require  libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
enabled libvorbis  && require  libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
enabled libvpx     && {
    enabled libvpx_decoder && { check_lib2 "vpx/vpx_decoder.h vpx/vp8dx.h" vpx_codec_dec_init_ver -lvpx ||
                                die "ERROR: libvpx decoder version must be >=0.9.1"; }
    enabled libvpx_encoder && { check_lib2 "vpx/vpx_encoder.h vpx/vp8cx.h" vpx_codec_enc_init_ver -lvpx ||
                                die "ERROR: libvpx encoder version must be >=0.9.1"; } }
enabled libx264    && require  libx264 x264.h x264_encoder_encode -lx264 &&
                      { check_cpp_condition x264.h "X264_BUILD >= 99" ||
                        die "ERROR: libx264 version must be >= 0.99."; }
enabled libxavs    && require  libxavs xavs.h xavs_encoder_encode -lxavs
enabled libxvid    && require  libxvid xvid.h xvid_global -lxvidcore
enabled mlib       && require  mediaLib mlib_types.h mlib_VectorSub_S16_U8_Mod -lmlib

# libdc1394 check
if enabled libdc1394; then
    { check_lib dc1394/dc1394.h dc1394_new -ldc1394 -lraw1394 &&
        enable libdc1394_2; } ||
    { check_lib libdc1394/dc1394_control.h dc1394_create_handle -ldc1394_control -lraw1394 &&
        enable libdc1394_1; } ||
    die "ERROR: No version of libdc1394 found "
fi

if check_pkg_config sdl SDL_version.h SDL_Linked_Version; then
    check_cpp_condition SDL.h "(SDL_MAJOR_VERSION<<16 | SDL_MINOR_VERSION<<8 | SDL_PATCHLEVEL) >= 0x010201" $sdl_cflags &&
    enable sdl &&
    check_struct SDL.h SDL_VideoInfo current_w $sdl_cflags && enable sdl_video_size
fi

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

check_header linux/videodev.h
check_header linux/videodev2.h
check_header sys/videoio.h

check_func_headers "windows.h vfw.h" capCreateCaptureWindow "$vfwcap_indev_extralibs"
# check that WM_CAP_DRIVER_CONNECT is defined to the proper value
# w32api 3.12 had it defined wrong
check_cpp_condition vfw.h "WM_CAP_DRIVER_CONNECT > WM_USER" && enable vfwcap_defines

# 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

enabled_any alsa_indev alsa_outdev && check_lib2 alsa/asoundlib.h snd_pcm_htimestamp -lasound

enabled jack_indev && check_lib2 jack/jack.h jack_client_open -ljack

enabled x11grab                         &&
check_header X11/Xlib.h                 &&
check_header X11/extensions/XShm.h      &&
check_header X11/extensions/Xfixes.h    &&
check_func XOpenDisplay -lX11           &&
check_func XShmCreateImage -lX11 -lXext &&
check_func XFixesGetCursorImage -lX11 -lXext -lXfixes

if ! disabled vdpau && enabled vdpau_vdpau_h; then
check_cpp_condition \
    vdpau/vdpau.h "defined VDP_DECODER_PROFILE_MPEG4_PART2_ASP" ||
    { echolog "Please upgrade to libvdpau >= 0.2 if you would like vdpau support." &&
      disable vdpau; }
fi

enabled debug && add_cflags -g"$debuglevel" && add_asflags -g"$debuglevel"

# add some useful compiler flags if supported
check_cflags -Wdeclaration-after-statement
check_cflags -Wall
check_cflags -Wno-parentheses
check_cflags -Wno-switch
check_cflags -Wdisabled-optimization
check_cflags -Wpointer-arith
check_cflags -Wredundant-decls
check_cflags -Wno-pointer-sign
check_cflags -Wcast-qual
check_cflags -Wwrite-strings
check_cflags -Wtype-limits
check_cflags -Wundef
check_cflags -Wmissing-prototypes
enabled extra_warnings && check_cflags -Winline

# add some linker flags
check_ldflags -Wl,--warn-common
check_ldflags -Wl,--as-needed
check_ldflags '-Wl,-rpath-link,\$(BUILD_ROOT)/libpostproc -Wl,-rpath-link,\$(BUILD_ROOT)/libswscale -Wl,-rpath-link,\$(BUILD_ROOT)/libavfilter -Wl,-rpath-link,\$(BUILD_ROOT)/libavdevice -Wl,-rpath-link,\$(BUILD_ROOT)/libavformat -Wl,-rpath-link,\$(BUILD_ROOT)/libavcodec -Wl,-rpath-link,\$(BUILD_ROOT)/libavutil'
test_ldflags -Wl,-Bsymbolic && append SHFLAGS -Wl,-Bsymbolic

echo "X{};" > $TMPV
if test_ldflags -Wl,--version-script,$TMPV; then
    append SHFLAGS '-Wl,--version-script,\$(SUBDIR)lib\$(NAME).ver'
    check_cc <<EOF && enable symver_asm_label
void ff_foo(void) __asm__ ("av_foo@VERSION");
void ff_foo(void) { ${inline_asm+__asm__($quotes);} }
EOF
    check_cc <<EOF && enable symver_gnu_asm
__asm__(".symver ff_foo,av_foo@VERSION");
void ff_foo(void) {}
EOF
fi

if enabled small; then
    add_cflags $size_cflags
    optimizations="small"
elif enabled optimizations; then
    add_cflags $speed_cflags
else
    add_cflags $noopt_cflags
fi
check_cflags -fno-math-errno
check_cflags -fno-signed-zeros

if enabled icc; then
    # Just warnings, no remarks
    check_cflags -w1
    # -wd: Disable following warnings
    # 144, 167, 556: -Wno-pointer-sign
    # 10006: ignoring unknown option -fno-signed-zeros
    # 10148: ignoring unknown option -Wno-parentheses
    # 10156: ignoring option '-W'; no argument required
    check_cflags -wd144,167,556,10006,10148,10156
    # 11030: Warning unknown option --as-needed
    # 10156: ignoring option '-export'; no argument required
    check_ldflags -wd10156,11030
    # Allow to compile with optimizations
    check_ldflags -march=$cpu
    # icc 11.0 and 11.1 work with ebp_available, but don't pass the test
    enable ebp_available