configure

#!/bin/bash

if test x"$1" = x"-h" -o x"$1" = x"--help" ; then
cat <<EOF
Usage: ./configure [options]

Help:
  -h, --help               print this message

Standard options:
  --prefix=PREFIX          install architecture-independent files in PREFIX
                           [/usr/local]
  --exec-prefix=EPREFIX    install architecture-dependent files in EPREFIX
                           [PREFIX]
  --bindir=DIR             install binaries in DIR [EPREFIX/bin]
  --libdir=DIR             install libs in DIR [EPREFIX/lib]
  --includedir=DIR         install includes in DIR [PREFIX/include]
  --extra-asflags=EASFLAGS add EASFLAGS to ASFLAGS
  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS
  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS
  --extra-rcflags=ERCFLAGS add ERCFLAGS to RCFLAGS

Configuration options:
  --disable-cli            disable cli
  --system-libx264         use system libx264 instead of internal
  --enable-shared          build shared library
  --enable-static          build static library
  --disable-opencl         disable OpenCL features
  --disable-gpl            disable GPL-only features
  --disable-thread         disable multithreaded encoding
  --disable-win32thread    disable win32threads (windows only)
  --disable-interlaced     disable interlaced encoding support
  --bit-depth=BIT_DEPTH    set output bit depth (8-10) [8]
  --chroma-format=FORMAT   output chroma format (420, 422, 444, all) [all]

Advanced options:
  --disable-asm            disable platform-specific assembly optimizations
  --enable-debug           add -g
  --enable-gprof           add -pg
  --enable-strip           add -s
  --enable-pic             build position-independent code

Cross-compilation:
  --host=HOST              build programs to run on HOST
  --cross-prefix=PREFIX    use PREFIX for compilation tools
  --sysroot=SYSROOT        root of cross-build tree

External library support:
  --disable-avs            disable avisynth support
  --disable-swscale        disable swscale support
  --disable-lavf           disable libavformat support
  --disable-ffms           disable ffmpegsource support
  --disable-gpac           disable gpac support
  --disable-lsmash         disable lsmash support

EOF
exit 1
fi

log_check() {
    echo -n "checking $1... " >> config.log
}

log_ok() {
    echo "yes" >> config.log
}

log_fail() {
    echo "no" >> config.log
}

log_msg() {
    echo "$1" >> config.log
}

cc_cflags() {
    # several non gcc compilers issue an incredibly large number of warnings on high warning levels,
    # suppress them by reducing the warning level rather than having to use #pragmas
    for arg in $*; do
        [[ "$arg" = -falign-loops* ]] && arg=
        [ "$arg" = -fno-tree-vectorize ] && arg=
        [ "$arg" = -Wshadow ] && arg=
        [ "$arg" = -Wno-maybe-uninitialized ] && arg=
        [[ "$arg" = -mpreferred-stack-boundary* ]] && arg=
        [[ "$arg" = -l* ]] && arg=
        [[ "$arg" = -L* ]] && arg=
        if [ $compiler_style = MS ]; then
            [ "$arg" = -ffast-math ] && arg="-fp:fast"
            [ "$arg" = -Wall ] && arg=
            [ "$arg" = -Werror ] && arg="-W3 -WX"
            [ "$arg" = -g ] && arg=-Z7
            [ "$arg" = -fomit-frame-pointer ] && arg=
            [ "$arg" = -s ] && arg=
            [ "$arg" = -fPIC ] && arg=
        else
            [ "$arg" = -ffast-math ] && arg=
            [ "$arg" = -Wall ] && arg=
            [ "$arg" = -Werror ] && arg="-w3 -Werror"
        fi
        [ $compiler = CL -a "$arg" = -O3 ] && arg=-O2

        [ -n "$arg" ] && echo -n "$arg "
    done
}

cl_ldflags() {
    for arg in $*; do
        arg=${arg/LIBPATH/libpath}
        [ "${arg#-libpath:}" == "$arg" -a "${arg#-l}" != "$arg" ] && arg=${arg#-l}.lib
        [ "${arg#-L}" != "$arg" ] && arg=-libpath:${arg#-L}
        [ "$arg" = -Wl,--large-address-aware ] && arg=-largeaddressaware
        [ "$arg" = -s ] && arg=
        [ "$arg" = -Wl,-Bsymbolic ] && arg=
        [ "$arg" = -fno-tree-vectorize ] && arg=
        [ "$arg" = -Werror ] && arg=
        [ "$arg" = -Wshadow ] && arg=
        [ "$arg" = -Wmaybe-uninitialized ] && arg=
        [[ "$arg" = -Qdiag-error* ]] && arg=

        arg=${arg/pthreadGC/pthreadVC}
        [ "$arg" = avifil32.lib ] && arg=vfw32.lib
        [ "$arg" = gpac_static.lib ] && arg=libgpac_static.lib
        [ "$arg" = x264.lib ] && arg=libx264.lib

        [ -n "$arg" ] && echo -n "$arg "
    done
}

cc_check() {
    if [ -z "$3" ]; then
        if [ -z "$1$2" ]; then
            log_check "whether $CC works"
        elif [ -z "$1" ]; then
            log_check "for $2"
        else
            log_check "for $1"
        fi
    elif [ -z "$1" ]; then
        if [ -z "$2" ]; then
            log_check "whether $CC supports $3"
        else
            log_check "whether $CC supports $3 with $2"
        fi
    else
        log_check "for $3 in $1";
    fi
    rm -f conftest.c
    for arg in $1; do
        echo "#include <$arg>" >> conftest.c
    done
    echo "int main (void) { $3 return 0; }" >> conftest.c
    if [ $compiler_style = MS ]; then
        cc_cmd="$CC conftest.c $(cc_cflags $CFLAGS $CHECK_CFLAGS $2) -link $(cl_ldflags $2 $LDFLAGSCLI $LDFLAGS)"
    else
        cc_cmd="$CC conftest.c $CFLAGS $CHECK_CFLAGS $2 $LDFLAGSCLI $LDFLAGS -o conftest"
    fi
    if $cc_cmd >conftest.log 2>&1; then
        res=$?
        log_ok
    else
        res=$?
        log_fail
        log_msg "Failed commandline was:"
        log_msg "--------------------------------------------------"
        log_msg "$cc_cmd"
        cat conftest.log >> config.log
        log_msg "--------------------------------------------------"
        log_msg "Failed program was:"
        log_msg "--------------------------------------------------"
        cat conftest.c >> config.log
        log_msg "--------------------------------------------------"
    fi
    return $res
}

cpp_check() {
    log_check "whether $3 is true"
    rm -f conftest.c
    for arg in $1; do
        echo "#include <$arg>" >> conftest.c
    done
    echo -e "#if !($3) \n#error $4 \n#endif " >> conftest.c
    if [ $compiler_style = MS ]; then
        cpp_cmd="$CC conftest.c $(cc_cflags $CFLAGS $2) -P"
    else
        cpp_cmd="$CC conftest.c $CFLAGS $2 -E -o conftest"
    fi
    if $cpp_cmd >conftest.log 2>&1; then
        res=$?
        log_ok
    else
        res=$?
        log_fail
        log_msg "--------------------------------------------------"
        cat conftest.log >> config.log
        log_msg "--------------------------------------------------"
        log_msg "Failed program was:"
        log_msg "--------------------------------------------------"
        cat conftest.c >> config.log
        log_msg "--------------------------------------------------"
    fi
    return $res
}

as_check() {
    log_check "whether $AS supports $1"
    echo "$1" > conftest$AS_EXT
    as_cmd="$AS conftest$AS_EXT $ASFLAGS $2 -o conftest.o"
    if $as_cmd >conftest.log 2>&1; then
        res=$?
        log_ok
    else
        res=$?
        log_fail
        log_msg "Failed commandline was:"
        log_msg "--------------------------------------------------"
        log_msg "$as_cmd"
        cat conftest.log >> config.log
        log_msg "--------------------------------------------------"
        log_msg "Failed program was:"
        log_msg "--------------------------------------------------"
        cat conftest$AS_EXT >> config.log
        log_msg "--------------------------------------------------"
    fi
    return $res
}

rc_check() {
    log_check "whether $RC works"
    echo "$1" > conftest.rc
    if [ $compiler = GNU ]; then
        rc_cmd="$RC $RCFLAGS -o conftest.o conftest.rc"
    else
        rc_cmd="$RC $RCFLAGS -foconftest.o conftest.rc"
    fi
    if $rc_cmd >conftest.log 2>&1; then
        res=$?
        log_ok
    else
        res=$?
        log_fail
        log_msg "Failed commandline was:"
        log_msg "--------------------------------------------------"
        log_msg "$rc_cmd"
        cat conftest.log >> config.log
        log_msg "--------------------------------------------------"
        log_msg "Failed program was:"
        log_msg "--------------------------------------------------"
        cat conftest.rc >> config.log
        log_msg "--------------------------------------------------"
    fi
    return $res
}

define() {
    echo "#define $1$([ -n "$2" ] && echo " $2" || echo " 1")" >> config.h
}

die() {
    log_msg "DIED: $@"
    echo "$@"
    exit 1
}

configure_system_override() {
    log_check "system libx264 configuration"
    x264_config_path="$1/x264_config.h"
    if [ -e "$x264_config_path" ]; then
        res=$?
        log_ok
        arg="$(grep '#define X264_GPL ' $x264_config_path | sed -e 's/#define X264_GPL *//; s/ *$//')"
        if [ -n "$arg" ]; then
            [ "$arg" = 0 ] && arg="no" || arg="yes"
            [ "$arg" != "$gpl" ] && die "Incompatible license with system libx264"
        fi
        arg="$(grep '#define X264_BIT_DEPTH ' $x264_config_path | sed -e 's/#define X264_BIT_DEPTH *//; s/ *$//')"
        if [ -n "$arg" ]; then
            if [ "$arg" != "$bit_depth" ]; then
                echo "Override output bit depth with system libx264 configuration"
                bit_depth="$arg"
            fi
        fi
        arg="$(grep '#define X264_CHROMA_FORMAT ' $x264_config_path | sed -e 's/#define X264_CHROMA_FORMAT *//; s/ *$//')"
        if [ -n "$arg" ]; then
            [ "$arg" = 0 ] && arg="all" || arg="${arg#X264_CSP_I}"
            if [ "$arg" != "$chroma_format" ]; then
                echo "Override output chroma format with system libx264 configuration"
                chroma_format="$arg"
            fi
        fi
        arg="$(grep '#define X264_INTERLACED ' $x264_config_path | sed -e 's/#define X264_INTERLACED *//; s/ *$//')"
        if [ -n "$arg" ]; then
            [ "$arg" = 0 ] && arg="no" || arg="yes"
            if [ "$arg" != "$interlaced" ]; then
                echo "Override interlaced encoding support with system libx264 configuration"
                interlaced="$arg"
            fi
        fi
    else
        res=$?
        log_fail
        log_msg "Failed search path was: $x264_config_path"
    fi
    return $res
}

rm -f x264_config.h config.h config.mak config.log x264.pc x264.def conftest*

# Construct a path to the specified directory relative to the working directory
relative_path() {
    local base="${PWD%/}"
    local path="$(cd "$1" >/dev/null; printf '%s/.' "${PWD%/}")"
    local up=''

    while [[ $path != "$base/"* ]]; do
        base="${base%/*}"
        up="../$up"
    done

    dirname "$up${path#"$base/"}"
}

SRCPATH="$(relative_path "$(dirname "$0")")"
echo "$SRCPATH" | grep -q ' ' && die "Out of tree builds are impossible with whitespace in source path."
[ -e "$SRCPATH/config.h" -o -e "$SRCPATH/x264_config.h" ] && die "Out of tree builds are impossible with config.h/x264_config.h in source dir."

prefix='/usr/local'
exec_prefix='${prefix}'
bindir='${exec_prefix}/bin'
libdir='${exec_prefix}/lib'
includedir='${prefix}/include'
DEVNULL='/dev/null'

cli="yes"
cli_libx264="internal"
shared="no"
static="no"
avs="auto"
lavf="auto"
ffms="auto"
gpac="auto"
lsmash="auto"
mp4="no"
gpl="yes"
thread="auto"
swscale="auto"
asm="auto"
interlaced="yes"
debug="no"
gprof="no"
strip="no"
pic="no"
bit_depth="8"
chroma_format="all"
compiler="GNU"
compiler_style="GNU"
opencl="yes"

CFLAGS="$CFLAGS -Wall -I. -I\$(SRCPATH)"
LDFLAGS="$LDFLAGS"
LDFLAGSCLI="$LDFLAGSCLI"
ASFLAGS="$ASFLAGS -I. -I\$(SRCPATH)"
RCFLAGS="$RCFLAGS"
CHECK_CFLAGS=""
HAVE_GETOPT_LONG=1
cross_prefix=""

EXE=""
AS_EXT=".S"
NL="
"

# list of all preprocessor HAVE values we can define
CONFIG_HAVE="MALLOC_H ALTIVEC ALTIVEC_H MMX ARMV6 ARMV6T2 NEON BEOSTHREAD POSIXTHREAD WIN32THREAD THREAD LOG2F SWSCALE \
             LAVF FFMS GPAC AVS GPL VECTOREXT INTERLACED CPU_COUNT OPENCL THP LSMASH X86_INLINE_ASM AS_FUNC INTEL_DISPATCHER \
             MSA"

# parse options

for opt do
    optarg="${opt#*=}"
    case "$opt" in
        --prefix=*)
            prefix="$optarg"
            ;;
        --exec-prefix=*)
            exec_prefix="$optarg"
            ;;
        --bindir=*)
            bindir="$optarg"
            ;;
        --libdir=*)
            libdir="$optarg"
            ;;
        --includedir=*)
            includedir="$optarg"
            ;;
        --disable-cli)
            cli="no"
            ;;
        --system-libx264)
            cli_libx264="system"
            ;;
        --enable-shared)
            shared="yes"
            ;;
        --enable-static)
            static="yes"
            ;;
        --disable-asm)
            asm="no"
            ;;
        --disable-interlaced)
            interlaced="no"
            ;;
        --disable-avs)
            avs="no"
            ;;
        --disable-lavf)
            lavf="no"
            ;;
        --disable-ffms)
            ffms="no"
            ;;
        --disable-gpac)
            gpac="no"
            ;;
        --disable-lsmash)
            lsmash="no"
            ;;
        --disable-gpl)
            gpl="no"
            ;;
        --extra-asflags=*)
            ASFLAGS="$ASFLAGS $optarg"
            ;;
        --extra-cflags=*)
            CFLAGS="$CFLAGS $optarg"
            ;;
        --extra-ldflags=*)
            LDFLAGS="$LDFLAGS $optarg"
            ;;
        --extra-rcflags=*)
            RCFLAGS="$RCFLAGS $optarg"
            ;;
        --disable-thread)
            thread="no"
            ;;
        --disable-win32thread)
            [ "$thread" != "no" ] && thread="posix"
            ;;
        --disable-swscale)
            swscale="no"
            ;;
        --enable-debug)
            debug="yes"
            ;;
        --enable-gprof)
            CFLAGS="$CFLAGS -pg"
            LDFLAGS="$LDFLAGS -pg"
            gprof="yes"
            ;;
        --enable-strip)
            strip="yes"
            ;;
        --enable-pic)
            pic="yes"
            ;;
        --host=*)
            host="$optarg"
            ;;
        --disable-opencl)
            opencl="no"
            ;;
        --cross-prefix=*)
            cross_prefix="$optarg"
            ;;
        --sysroot=*)
            CFLAGS="$CFLAGS --sysroot=$optarg"
            LDFLAGS="$LDFLAGS --sysroot=$optarg"
            ;;
        --bit-depth=*)
            bit_depth="$optarg"
            if [ "$bit_depth" -lt "8" -o "$bit_depth" -gt "10" ]; then
                echo "Supplied bit depth must be in range [8,10]."
                exit 1
            fi
            bit_depth=`expr $bit_depth + 0`
            ;;
        --chroma-format=*)
            chroma_format="$optarg"
            if [ $chroma_format != "420" -a $chroma_format != "422" -a $chroma_format != "444" -a $chroma_format != "all" ]; then
                echo "Supplied chroma format must be 420, 422, 444 or all."
                exit 1
            fi
            ;;
        *)
            echo "Unknown option $opt, ignored"
            ;;
    esac
done

[ "$cli" = "no" -a "$shared" = "no" -a "$static" = "no" ] && die "Nothing to build. Enable cli, shared or static."

CC="${CC-${cross_prefix}gcc}"
AR="${AR-${cross_prefix}ar}"
RANLIB="${RANLIB-${cross_prefix}ranlib}"
STRIP="${STRIP-${cross_prefix}strip}"
INSTALL="${INSTALL-install}"

if [ "x$host" = x ]; then
    host=`${SRCPATH}/config.guess`
fi
# normalize a triplet into a quadruplet
host=`${SRCPATH}/config.sub $host`

# split $host
host_cpu="${host%%-*}"
host="${host#*-}"
host_vendor="${host%%-*}"
host_os="${host#*-}"

trap 'rm -f conftest*' EXIT

# test for use of compilers that require specific handling
cc_base=`basename "$CC"`
QPRE="-"
if [[ $host_os = mingw* || $host_os = cygwin* ]]; then
    if [[ "$cc_base" = icl || "$cc_base" = icl[\ .]* ]]; then
        # Windows Intel Compiler creates dependency generation with absolute Windows paths, Cygwin's make does not support Windows paths.
        [[ $host_os = cygwin* ]] && die "Windows Intel Compiler support requires MSYS"
        compiler=ICL
        compiler_style=MS
        CFLAGS="$CFLAGS -Qstd=c99 -nologo -Qms0 -DHAVE_STRING_H -I\$(SRCPATH)/extras"
        QPRE="-Q"
        `$CC 2>&1 | grep -q IA-32` && host_cpu=i486
        `$CC 2>&1 | grep -q "Intel(R) 64"` && host_cpu=x86_64
        cpp_check "" "" "_MSC_VER >= 1400" || die "Windows Intel Compiler support requires Visual Studio 2005 or newer"
        if cc_check '' -Qdiag-error:10006,10157 ; then
            CHECK_CFLAGS="$CHECK_CFLAGS -Qdiag-error:10006,10157"
        fi
    elif [[ "$cc_base" = cl || "$cc_base" = cl[\ .]* ]]; then
        # Standard Microsoft Visual Studio
        compiler=CL
        compiler_style=MS
        CFLAGS="$CFLAGS -nologo -GS- -DHAVE_STRING_H -I\$(SRCPATH)/extras"
        `$CC 2>&1 | grep -q 'x86'` && host_cpu=i486
        `$CC 2>&1 | grep -q 'x64'` && host_cpu=x86_64
        cpp_check '' '' '_MSC_VER > 1800 || (_MSC_VER == 1800 && _MSC_FULL_VER >= 180030324)' || die "Microsoft Visual Studio support requires Visual Studio 2013 Update 2 or newer"
    fi
else
    if [[ "$cc_base" = icc || "$cc_base" = icc[\ .]* ]]; then
        AR="xiar"
        compiler=ICC
    fi
fi

if [[ "$cc_base" = clang || "$cc_base" = clang[\ .]* ]]; then
    if cc_check '' -Werror=unknown-warning-option ; then
        CHECK_CFLAGS="$CHECK_CFLAGS -Werror=unknown-warning-option"
    fi
fi

libm=""
case $host_os in
    beos*)
        SYS="BEOS"
        define HAVE_MALLOC_H
        ;;
    darwin*)
        SYS="MACOSX"
        libm="-lm"
        if [ "$pic" = "no" ]; then
            cc_check "" -mdynamic-no-pic && CFLAGS="$CFLAGS -mdynamic-no-pic"
        fi
        ;;
    freebsd*)
        SYS="FREEBSD"
        libm="-lm"
        ;;
    kfreebsd*-gnu)
        SYS="FREEBSD"
        define HAVE_MALLOC_H
        libm="-lm"
        ;;
    netbsd*)
        SYS="NETBSD"
        libm="-lm"
        ;;
    openbsd*)
        SYS="OPENBSD"
        libm="-lm"
        ;;
    *linux*)
        SYS="LINUX"
        define HAVE_MALLOC_H
        libm="-lm"
        ;;
    gnu*)
        SYS="HURD"
        define HAVE_MALLOC_H
        libm="-lm"
        ;;
    cygwin*|mingw*|msys*)
        EXE=".exe"
        if [[ $host_os = cygwin* ]] && cpp_check "" "" "defined(__CYGWIN__)" ; then
            SYS="CYGWIN"
            define HAVE_MALLOC_H
        else
            SYS="WINDOWS"
            DEVNULL="NUL"
            LDFLAGSCLI="$LDFLAGSCLI -lshell32"
            [ $compiler = GNU ] && RC="${RC-${cross_prefix}windres}" || RC="${RC-rc}"
        fi
        ;;
    sunos*|solaris*)
        SYS="SunOS"
        define HAVE_MALLOC_H
        libm="-lm"
        if cc_check "" /usr/lib/64/values-xpg6.o; then
            LDFLAGS="$LDFLAGS /usr/lib/64/values-xpg6.o"
        else
            LDFLAGS="$LDFLAGS /usr/lib/values-xpg6.o"
        fi
        if test -x /usr/ucb/install ; then
            INSTALL=/usr/ucb/install
        elif test -x /usr/bin/ginstall ; then
            # OpenSolaris
            INSTALL=/usr/bin/ginstall
        elif test -x /usr/gnu/bin/install ; then
            # OpenSolaris
            INSTALL=/usr/gnu/bin/install
        fi
        HAVE_GETOPT_LONG=0
        ;;
    *qnx*)
        SYS="QNX"
        define HAVE_MALLOC_H
        libm="-lm"
        HAVE_GETOPT_LONG=0
        CFLAGS="$CFLAGS -I\$(SRCPATH)/extras"
        ;;
    *haiku*)
        SYS="HAIKU"
        ;;
    *)
        die "Unknown system $host, edit the configure"
        ;;
esac

LDFLAGS="$LDFLAGS $libm"

stack_alignment=4
case $host_cpu in
    i*86)
        ARCH="X86"
        AS="${AS-yasm}"
        AS_EXT=".asm"
        ASFLAGS="$ASFLAGS -DARCH_X86_64=0 -I\$(SRCPATH)/common/x86/"
        if [ $compiler = GNU ]; then
            if [[ "$asm" == auto && "$CFLAGS" != *-march* ]]; then
                CFLAGS="$CFLAGS -march=i686"
            fi
            if [[ "$asm" == auto && "$CFLAGS" != *-mfpmath* ]]; then
                CFLAGS="$CFLAGS -mfpmath=sse -msse -msse2"
            fi
            CFLAGS="-m32 $CFLAGS"
            LDFLAGS="-m32 $LDFLAGS"
        fi
        if [ "$SYS" = MACOSX ]; then
            ASFLAGS="$ASFLAGS -f macho32 -DPREFIX"
        elif [ "$SYS" = WINDOWS -o "$SYS" = CYGWIN ]; then
            ASFLAGS="$ASFLAGS -f win32 -DPREFIX"
            LDFLAGS="$LDFLAGS -Wl,--large-address-aware"
            [ $compiler = GNU ] && LDFLAGS="$LDFLAGS -Wl,--dynamicbase,--nxcompat,--tsaware"
            [ $compiler = GNU ] && RCFLAGS="--target=pe-i386 $RCFLAGS"
        else
            ASFLAGS="$ASFLAGS -f elf32"
        fi
        ;;
    x86_64)
        ARCH="X86_64"
        AS="${AS-yasm}"
        AS_EXT=".asm"
        ASFLAGS="$ASFLAGS -DARCH_X86_64=1 -I\$(SRCPATH)/common/x86/"
        stack_alignment=16
        [ $compiler = GNU ] && CFLAGS="-m64 $CFLAGS" && LDFLAGS="-m64 $LDFLAGS"
        if [ "$SYS" = MACOSX ]; then
            ASFLAGS="$ASFLAGS -f macho64 -DPIC -DPREFIX"
            if cc_check '' "-arch x86_64"; then
                CFLAGS="$CFLAGS -arch x86_64"
                LDFLAGS="$LDFLAGS -arch x86_64"
            fi
        elif [ "$SYS" = WINDOWS -o "$SYS" = CYGWIN ]; then
            ASFLAGS="$ASFLAGS -f win64"
            # only the GNU toolchain is inconsistent in prefixing function names with _
            [ $compiler = GNU ] && cc_check "" "-S" && grep -q "_main:" conftest && ASFLAGS="$ASFLAGS -DPREFIX"
            [ $compiler = GNU ] && LDFLAGS="$LDFLAGS -Wl,--dynamicbase,--nxcompat,--tsaware"
            [ $compiler = GNU ] && RCFLAGS="--target=pe-x86-64 $RCFLAGS"
        else
            ASFLAGS="$ASFLAGS -f elf64"
        fi
        ;;
    powerpc*)
        ARCH="PPC"
        if [ $asm = auto ] ; then
            define HAVE_ALTIVEC
            AS="${AS-${CC}}"
            AS_EXT=".c"
            if [ $SYS = MACOSX ] ; then
                CFLAGS="$CFLAGS -faltivec -fastf -mcpu=G4"
            else
                CFLAGS="$CFLAGS -maltivec -mabi=altivec"
                define HAVE_ALTIVEC_H
            fi
        fi
        ;;
    sparc)
        ARCH="SPARC"
        ;;
    mips*)
        ARCH="MIPS"
        AS="${AS-${CC}}"
        AS_EXT=".c"
        ;;
    arm*)
        ARCH="ARM"
        if [ "$SYS" = MACOSX ] ; then
            AS="${AS-${SRCPATH}/tools/gas-preprocessor.pl -arch arm -- ${CC}}"
            ASFLAGS="$ASFLAGS -DPREFIX -DPIC"  # apple's ld doesn't support movw/movt relocations at all
            # build for armv7 by default
            if ! echo $CFLAGS | grep -Eq '\-arch' ; then
                CFLAGS="$CFLAGS -arch armv7"
                LDFLAGS="$LDFLAGS -arch armv7"
            fi
        else
            AS="${AS-${CC}}"
        fi
        ;;
    aarch64)
        ARCH="AARCH64"
        stack_alignment=16
        if [ "$SYS" = MACOSX ] ; then
            AS="${AS-${SRCPATH}/tools/gas-preprocessor.pl -arch aarch64 -- ${CC}}"
            ASFLAGS="$ASFLAGS -DPREFIX"
        else
            AS="${AS-${CC}}"
        fi
        ;;
    s390|s390x)
        ARCH="S390"
        ;;
    hppa*|parisc*)
        ARCH="PARISC"
        ;;
    ia64)
        ARCH="IA64"
        ;;
    alpha*)
        ARCH="ALPHA"
        ;;
    *)
        ARCH="$(echo $host_cpu | tr a-z A-Z)"
        ;;
esac

if [ $SYS = WINDOWS ]; then
    if ! rc_check "0 RCDATA {0}" ; then
        RC=""
    fi
fi

log_msg "x264 configure script"
if [ -n "$*" ]; then
    msg="Command line options:"
    for i in $@; do
        msg="$msg \"$i\""
    done
    log_msg "$msg"
fi
log_msg ""

# check requirements

cc_check || die "No working C compiler found."

if [ $compiler_style = GNU ]; then
    if cc_check '' -std=gnu99 'for( int i = 0; i < 9; i++ );' ; then
        CFLAGS="$CFLAGS -std=gnu99"
    elif cc_check '' -std=c99 'for( int i = 0; i < 9; i++ );' ; then
        CFLAGS="$CFLAGS -std=c99 -D_POSIX_C_SOURCE=200112L -D_BSD_SOURCE"
    elif ! cc_check '' '' 'for( int i = 0; i < 9; i++ );' ; then
        die "C99 compiler is needed for compilation."
    fi
fi

if [ $shared = yes -a \( $ARCH = "X86_64" -o $ARCH = "PPC" -o $ARCH = "ALPHA" -o $ARCH = "ARM" -o $ARCH = "IA64" -o $ARCH = "PARISC" -o $ARCH = "MIPS" -o $ARCH = "AARCH64" \) ] ; then
    pic="yes"
fi

if [ $compiler = GNU -a \( $ARCH = X86 -o $ARCH = X86_64 \) ] ; then
    if cc_check '' -mpreferred-stack-boundary=5 ; then
        CFLAGS="$CFLAGS -mpreferred-stack-boundary=5"
        stack_alignment=32
    elif [ $stack_alignment -lt 16 ] && cc_check '' -mpreferred-stack-boundary=4 ; then
        CFLAGS="$CFLAGS -mpreferred-stack-boundary=4"
        stack_alignment=16
    fi
elif [ $compiler = ICC -a $ARCH = X86 ]; then
    # icc on linux has various degrees of mod16 stack support
    if [ $SYS = LINUX ]; then
        # >= 12 defaults to a mod16 stack
        if cpp_check "" "" "__INTEL_COMPILER >= 1200" ; then
            stack_alignment=16
        # 11 <= x < 12 is capable of keeping a mod16 stack, but defaults to not doing so.
        elif cpp_check "" "" "__INTEL_COMPILER >= 1100" ; then
            CFLAGS="$CFLAGS -falign-stack=assume-16-byte"
            stack_alignment=16
        fi
        # < 11 is completely incapable of keeping a mod16 stack
    fi
fi

if [ $asm = auto -a \( $ARCH = X86 -o $ARCH = X86_64 \) ] ; then
    if ! as_check "vpmovzxwd ymm0, xmm0" ; then
        VER=`($AS --version || echo no assembler) 2>/dev/null | head -n 1`
        echo "Found $VER"
        echo "Minimum version is yasm-1.2.0"
        echo "If you really want to compile without asm, configure with --disable-asm."
        exit 1
    fi
    cc_check '' '' '__asm__("pabsw %xmm0, %xmm0");' && define HAVE_X86_INLINE_ASM
    ASFLAGS="$ASFLAGS -Worphan-labels"
    define HAVE_MMX
fi

if [ $asm = auto -a $ARCH = ARM ] ; then
    # set flags so neon is built by default
    echo $CFLAGS | grep -Eq '(-mcpu|-march|-mfpu)' || CFLAGS="$CFLAGS -mcpu=cortex-a8 -mfpu=neon"

    if  cc_check '' '' '__asm__("rev ip, ip");' ; then      define HAVE_ARMV6
        cc_check '' '' '__asm__("movt r0, #0");'         && define HAVE_ARMV6T2
        cc_check '' '' '__asm__("vadd.i16 q0, q0, q0");' && define HAVE_NEON
        ASFLAGS="$ASFLAGS -c"
    else
        echo "You specified a pre-ARMv6 or Thumb-1 CPU in your CFLAGS."
        echo "If you really want to run on such a CPU, configure with --disable-asm."
        exit 1
    fi
fi

if [ $asm = auto -a $ARCH = AARCH64 ] ; then
    if  cc_check '' '' '__asm__("cmeq v0.8h, v0.8h, #0");' ; then define HAVE_NEON
        ASFLAGS="$ASFLAGS -c"
    else
        echo "no NEON support, try adding -mfpu=neon to CFLAGS"
        echo "If you really want to run on such a CPU, configure with --disable-asm."
        exit 1
    fi
fi

if [ $asm = auto -a \( $ARCH = ARM -o $ARCH = AARCH64 \) ] ; then
    # check if the assembler supports '.func' (clang 3.5 does not)
    as_check ".func test${NL}.endfunc" && define HAVE_AS_FUNC 1
fi

if [ $asm = auto -a $ARCH = MIPS ] ; then
    if ! echo $CFLAGS | grep -Eq '(-march|-mmsa|-mno-msa)' ; then
        cc_check '' '-mmsa -mfp64 -mhard-float' && CFLAGS="-mmsa -mfp64 -mhard-float $CFLAGS"
    fi

    if cc_check '' '' '__asm__("addvi.b $w0, $w1, 1");' ; then
        define HAVE_MSA
    else
        echo "You specified a pre-MSA CPU in your CFLAGS."
        echo "If you really want to run on such a CPU, configure with --disable-asm."
        exit 1
    fi
fi

[ $asm = no ] && AS=""
[ "x$AS" = x ] && asm="no" || asm="yes"

define ARCH_$ARCH
define SYS_$SYS

define STACK_ALIGNMENT $stack_alignment
ASFLAGS="$ASFLAGS -DSTACK_ALIGNMENT=$stack_alignment"

# skip endianness check for Intel Compiler and MSVS, as all supported platforms are little. each have flags that will cause the check to fail as well
CPU_ENDIAN="little-endian"
if [ $compiler = GNU ]; then
    echo "int i[2] = {0x42494745,0}; double f[2] = {0x1.0656e6469616ep+102,0};" > conftest.c
    $CC $CFLAGS conftest.c -c -o conftest.o 2>/dev/null || die "endian test failed"
    if (${cross_prefix}strings -a conftest.o | grep -q BIGE) && (${cross_prefix}strings -a conftest.o | grep -q FPendian) ; then
        define WORDS_BIGENDIAN
        CPU_ENDIAN="big-endian"
    elif !(${cross_prefix}strings -a conftest.o | grep -q EGIB && ${cross_prefix}strings -a conftest.o | grep -q naidnePF) ; then
        die "endian test failed"
    fi
fi

if [ "$cli_libx264" = "system" -a "$shared" != "yes" ] ; then
    [ "$static" = "yes" ] && die "Option --system-libx264 can not be used together with --enable-static"
    if ${cross_prefix}pkg-config --exists x264 2>/dev/null; then
        X264_LIBS="$(${cross_prefix}pkg-config --libs x264)"
        X264_INCLUDE_DIR="${X264_INCLUDE_DIR-$(${cross_prefix}pkg-config --variable=includedir x264)}"
        configure_system_override "$X264_INCLUDE_DIR" || die "Detection of system libx264 configuration failed"
    else
        die "Can not find system libx264"
    fi
fi

# autodetect options that weren't forced nor disabled

libpthread=""
if [ "$SYS" = "WINDOWS" -a "$thread" = "posix" ] ; then
    if [ "$gpl" = "no" ] ; then
        echo "Warning: pthread-win32 is LGPL and is therefore not supported with --disable-gpl"
        thread="no"
    elif cc_check pthread.h -lpthread "pthread_create(0,0,0,0);" ; then
        libpthread="-lpthread"
    elif cc_check pthread.h -lpthreadGC2 "pthread_create(0,0,0,0);" ; then
        libpthread="-lpthreadGC2"
    elif cc_check pthread.h "-lpthreadGC2 -lwsock32 -DPTW32_STATIC_LIB" "pthread_create(0,0,0,0);" ; then
        libpthread="-lpthreadGC2 -lwsock32"
        define PTW32_STATIC_LIB
    elif cc_check pthread.h "-lpthreadGC2 -lws2_32 -DPTW32_STATIC_LIB" "pthread_create(0,0,0,0);" ; then
        libpthread="-lpthreadGC2 -lws2_32"
        define PTW32_STATIC_LIB
    else
        thread="no"
    fi
elif [ "$thread" != "no" ] ; then
    thread="no"
    case $SYS in
        BEOS)
            thread="beos"
            define HAVE_BEOSTHREAD
            ;;
        WINDOWS)
            thread="win32"
            define HAVE_WIN32THREAD
            ;;
        QNX)
            cc_check pthread.h -lc "pthread_create(0,0,0,0);" && thread="posix" && libpthread="-lc"
            ;;
        *)
            if cc_check pthread.h -lpthread "pthread_create(0,0,0,0);" ; then
               thread="posix"
               libpthread="-lpthread"
            else
                cc_check pthread.h "" "pthread_create(0,0,0,0);" && thread="posix" && libpthread=""
            fi
            ;;
    esac
fi
if [ "$thread" = "posix" ]; then
    LDFLAGS="$LDFLAGS $libpthread"
    define HAVE_POSIXTHREAD
    if [ "$SYS" = "LINUX" ] && cc_check sched.h "-D_GNU_SOURCE -Werror" "cpu_set_t p_aff; return CPU_COUNT(&p_aff);" ; then
        define HAVE_CPU_COUNT
    fi
fi
[ "$thread" != "no" ] && define HAVE_THREAD

if cc_check "math.h" "-Werror" "return log2f(2);" ; then
    define HAVE_LOG2F
fi

if [ "$SYS" = "LINUX" -a \( "$ARCH" = "X86" -o "$ARCH" = "X86_64" \) ] && cc_check "sys/mman.h" "" "MADV_HUGEPAGE;" ; then
    define HAVE_THP
fi

if [ "$swscale" = "auto" ] ; then
    swscale="no"
    if ${cross_prefix}pkg-config --exists libswscale 2>/dev/null; then
        SWSCALE_LIBS="$SWSCALE_LIBS $(${cross_prefix}pkg-config --libs libswscale libavutil)"
        SWSCALE_CFLAGS="$SWSCALE_CFLAGS $(${cross_prefix}pkg-config --cflags libswscale libavutil)"
    fi
    [ -z "$SWSCALE_LIBS" ] && SWSCALE_LIBS="-lswscale -lavutil"

    if cc_check "libswscale/swscale.h" "$SWSCALE_CFLAGS $SWSCALE_LIBS" "sws_init_context(0,0,0);" ; then
        if cpp_check "libavutil/pixdesc.h" "$SWSCALE_CFLAGS $SWSCALE_LIBS" "defined(AV_PIX_FMT_FLAG_RGB)" ; then
            swscale="yes"
        else
            echo "Warning: AV_PIX_FMT_FLAG_RGB is missing from libavutil, update for swscale support"
        fi
    fi
fi

if [ "$lavf" = "auto" ] ; then
    lavf="no"
    if ${cross_prefix}pkg-config --exists libavformat libavcodec libswscale 2>/dev/null; then
        LAVF_LIBS="$LAVF_LIBS $(${cross_prefix}pkg-config --libs libavformat libavcodec libavutil libswscale)"
        LAVF_CFLAGS="$LAVF_CFLAGS $(${cross_prefix}pkg-config --cflags libavformat libavcodec libavutil libswscale)"
    fi
    if [