#!/bin/bash

if test x"$1" = x"-h" -o x"$1" = x"--help" ; then

echo "Usage: ./configure [options]"
echo ""
echo "available options:"
echo ""
echo "  --help                   print this message"
echo "  --enable-debug           adds -g, doesn't strip"
echo "  --enable-pic             build position-independent code"
echo "  --disable-shared         don't build libmpegts.so"
echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS"
echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS"
echo "  --host=HOST              build programs to run on HOST"
echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools"
echo "  --sysroot=SYSROOT        root of cross-build tree"
echo ""
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_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
        log_check "whether $CC supports $3"
    else
        log_check "for $3 in $1";
    fi
    rm -f conftest.c
    [ -n "$1" ] && echo "#include <$1>" > conftest.c
    echo "int main () { $3 return 0; }" >> conftest.c
    if $CC conftest.c $CFLAGS $2 $LDFLAGSCLI $LDFLAGS -o conftest >conftest.log 2>&1; then
        res=$?
        log_ok
    else
        res=$?
        log_fail
        log_msg "Failed commandline was:"
        log_msg "--------------------------------------------------"
        log_msg "$CC conftest.c $CFLAGS $2 $LDFLAGSCLI $LDFLAGS"
        cat conftest.log >> 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
}

rm -f config.h config.mak config.log libmpegts.pc conftest*

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

debug="no"
pic="no"
shared="no"

CFLAGS="$CFLAGS -Wall -I."
LDFLAGS="$LDFLAGS"
LDFLAGSCLI="$LDFLAGSCLI"
cross_prefix=""

EXE=""

# 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="$optarg"
            ;;
        --extra-cflags=*)
            CFLAGS="$CFLAGS ${opt#--extra-cflags=}"
            ;;
        --extra-ldflags=*)
            LDFLAGS="$LDFLAGS ${opt#--extra-ldflags=}"
            ;;
        --enable-debug)
            debug="yes"
            ;;
        --enable-pic)
            pic="yes"
            ;;
        --disable-shared)
            shared="no"
            ;;
        --host=*)
            host="${opt#--host=}"
            ;;
        --cross-prefix=*)
            cross_prefix="${opt#--cross-prefix=}"
            ;;
        --sysroot=*)
            CFLAGS="$CFLAGS --sysroot=${opt#--sysroot=}"
            LDFLAGS="$LDFLAGS --sysroot=${opt#--sysroot=}"
            ;;
        *)
            echo "Unknown option $opt, ignored"
            ;;
    esac
done

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

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

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

case $host_os in
  beos*)
    SYS="BEOS"
    define HAVE_MALLOC_H
    ;;
  darwin*)
    SYS="MACOSX"
    CFLAGS="$CFLAGS -falign-loops=16"
    LDFLAGS="$LDFLAGS -lm"
    if [ "$pic" = "no" ]; then
        cc_check "" -mdynamic-no-pic && CFLAGS="$CFLAGS -mdynamic-no-pic"
    fi
    ;;
  freebsd*)
    SYS="FREEBSD"
    LDFLAGS="$LDFLAGS -lm"
    ;;
  kfreebsd*-gnu)
    SYS="FREEBSD"
    define HAVE_MALLOC_H
    LDFLAGS="$LDFLAGS -lm"
    ;;
  netbsd*)
    SYS="NETBSD"
    LDFLAGS="$LDFLAGS -lm"
    ;;
  openbsd*)
    SYS="OPENBSD"
    LDFLAGS="$LDFLAGS -lm"
    ;;
  *linux*)
    SYS="LINUX"
    define HAVE_MALLOC_H
    LDFLAGS="$LDFLAGS -lm"
    ;;
  cygwin*)
    SYS="MINGW"
    EXE=".exe"
    DEVNULL="NUL"
    if cc_check "" -mno-cygwin; then
        CFLAGS="$CFLAGS -mno-cygwin"
        LDFLAGS="$LDFLAGS -mno-cygwin"
    fi
    ;;
  mingw*)
    SYS="MINGW"
    EXE=".exe"
    DEVNULL="NUL"
    ;;
  sunos*|solaris*)
    SYS="SunOS"
    define HAVE_MALLOC_H
    LDFLAGS="$LDFLAGS -lm"
    ;;
  *)
    die "Unknown system $host, edit the configure"
    ;;
esac

case $host_cpu in
  i*86)
    ARCH="X86"
    if [[ "$CFLAGS" != *-march* ]]; then
      CFLAGS="$CFLAGS -march=i686"
    fi
    if [[ "$CFLAGS" != *-mfpmath* ]]; then
      CFLAGS="$CFLAGS -mfpmath=sse -msse"
    fi
    if [ "$SYS" = MINGW ]; then
      LDFLAGS="$LDFLAGS -Wl,--large-address-aware"
    fi
    ;;
  x86_64)
    ARCH="X86_64"
    if [ "$SYS" = MACOSX ];then
      if cc_check '' "-arch x86_64"; then
        CFLAGS="$CFLAGS -arch x86_64"
        LDFLAGS="$LDFLAGS -arch x86_64"
      fi
    elif [ "$SYS" = MINGW ]; then
      cc_check "" "-S" && grep -q "_main:" conftest
    fi
    ;;
  powerpc|powerpc64)
    ARCH="PPC"
    if [ $SYS = MACOSX ] ; then
      CFLAGS="$CFLAGS -faltivec -fastf -mcpu=G4"
    else
      CFLAGS="$CFLAGS -maltivec -mabi=altivec"
    fi
    ;;
  sparc)
    if test "$(uname -m)" = "sun4u"; then
      ARCH="UltraSparc"
      CFLAGS="$CFLAGS -mcpu=ultrasparc"
      LDFLAGS="$LDFLAGS -mcpu=ultrasparc"
    else
      ARCH="Sparc"
    fi
    ;;
  mips|mipsel|mips64|mips64el)
    ARCH="MIPS"
    ;;
  arm*)
    ARCH="ARM"
    if [ "$SYS" = MACOSX ] ; then
      # build for armv7 by default
      if ! echo $CFLAGS | grep -Eq '\-arch' ; then
        CFLAGS="$CFLAGS -arch armv7"
        LDFLAGS="$LDFLAGS -arch armv7"
      fi
    fi
    ;;
  s390|s390x)
    ARCH="S390"
    ;;
  parisc|parisc64)
    ARCH="PARISC"
    ;;
  ia64)
    ARCH="IA64"
    ;;
  *)
    ARCH="$(echo $host_cpu | tr a-z A-Z)"
    ;;
esac

log_msg "libmpegts 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 cc_check '' -std=gnu99 ; then
    CFLAGS="$CFLAGS -std=gnu99"
elif cc_check '' -std=c99 ; then
    CFLAGS="$CFLAGS -std=c99 -D_POSIX_C_SOURCE=200112L -D_BSD_SOURCE"
fi

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

define ARCH_$ARCH
define SYS_$SYS

echo "int i = 0x42494745; double f = 0x1.0656e6469616ep+102;" > conftest.c
$CC $CFLAGS conftest.c -c -o conftest.o 2>$DEVNULL || die "endian test failed"
if grep -q BIGE conftest.o && grep -q FPendian conftest.o ; then
    define WORDS_BIGENDIAN
elif !(grep -q EGIB conftest.o && grep -q naidnePF conftest.o) ; then
    die "endian test failed"
fi

# autodetect options that weren't forced nor disabled

if [ "$pic" = "yes" ] ; then
    CFLAGS="$CFLAGS -fPIC"
    # resolve textrels in the x86 asm
    cc_check stdio.h -Wl,-Bsymbolic && LDFLAGS="$LDFLAGS -Wl,-Bsymbolic"
fi

if [ "$debug" != "yes" -a "$gprof" != "yes" ]; then
    CFLAGS="$CFLAGS -s -fomit-frame-pointer"
    LDFLAGS="$LDFLAGS -s"
fi

if [ "$debug" = "yes" ]; then
    CFLAGS="-O1 -g $CFLAGS"
elif [ $ARCH = ARM ]; then
    # arm-gcc-4.2 produces incorrect output with -ffast-math
    # and it doesn't save any speed anyway on 4.4, so disable it
    CFLAGS="-O3 -fno-fast-math $CFLAGS"
else
    CFLAGS="-O3 -ffast-math $CFLAGS"
fi

if cc_check '' -fno-tree-vectorize ; then
    CFLAGS="$CFLAGS -fno-tree-vectorize"
fi

if cc_check "stdio.h" "" "fseeko(stdin,0,0);" ; then
    define fseek fseeko
    define ftell ftello
elif cc_check "stdio.h" "" "fseeko64(stdin,0,0);" ; then
    define fseek fseeko64
    define ftell ftello64
fi

if cc_check '' -Wshadow ; then
    CFLAGS="-Wshadow $CFLAGS"
fi

rm -f conftest*

# generate config files

cat > config.mak << EOF
prefix=$prefix
exec_prefix=$exec_prefix
bindir=$bindir
libdir=$libdir
includedir=$includedir
ARCH=$ARCH
SYS=$SYS
CC=$CC
CFLAGS=$CFLAGS
LDFLAGS=$LDFLAGS
LDFLAGSCLI=$LDFLAGSCLI
AR=$AR
RANLIB=$RANLIB
STRIP=$STRIP
EXE=$EXE
DEVNULL=$DEVNULL
EOF

if [ "$shared" = "yes" ]; then
    API=$(grep '#define LIBMPEGTS_API_VERSION_MAJOR' < libmpegts.h | cut -f 3 -d ' ')
    if [ "$SYS" = "MINGW" ]; then
        echo "SONAME=libmpegts-$API.dll" >> config.mak
        echo 'IMPLIBNAME=libmpegts.dll.a' >> config.mak
        echo 'SOFLAGS=-Wl,--out-implib,$(IMPLIBNAME) -Wl,--enable-auto-image-base' >> config.mak
    elif [ "$SYS" = "MACOSX" ]; then
        echo "SOSUFFIX=dylib" >> config.mak
        echo "SONAME=libmpegts.$API.dylib" >> config.mak
        echo 'SOFLAGS=-dynamiclib -Wl,-single_module -Wl,-read_only_relocs,suppress -install_name $(DESTDIR)$(libdir)/$(SONAME)' >> config.mak
    elif [ "$SYS" = "SunOS" ]; then
        echo "SOSUFFIX=so" >> config.mak
        echo "SONAME=libmpegts.so.$API" >> config.mak
        echo 'SOFLAGS=-Wl,-h,$(SONAME)' >> config.mak
    else
        echo "SOSUFFIX=so" >> config.mak
        echo "SONAME=libmpegts.so.$API" >> config.mak
        echo 'SOFLAGS=-Wl,-soname,$(SONAME)' >> config.mak
    fi
    echo 'default: $(SONAME)' >> config.mak
fi

./version.sh >> config.h

pclibs="-L$libdir -lmpegts"

cat > libmpegts.pc << EOF
prefix=$prefix
exec_prefix=$exec_prefix
libdir=$libdir
includedir=$includedir

Name: libmpegts
Description: MPEG-2 Systems Transport Stream Multiplexer
Version: $(grep POINTVER < config.h | sed -e 's/.* "//; s/".*//')
Libs: $pclibs
Cflags: -I$includedir
EOF

cat > conftest.log <<EOF
Platform:   $ARCH
System:     $SYS
debug:      $debug
PIC:        $pic
shared:     $shared
EOF

echo >> config.log
cat conftest.log >> config.log
cat conftest.log
rm conftest.log

echo
echo "You can run 'make' now."