#!/bin/sh
#
# Flake configure script
#
# based on ffmpeg configure script (c) 2000, 2001, 2002 Fabrice Bellard
#

# make sure we are running under a compatible shell
unset foo
(: ${foo%%bar}) 2>/dev/null && ! (: ${foo?}) 2>/dev/null
if test "$?" != 0; then
    if test "x$FLAKE_CONFIGURE_EXEC" = x; then
        FLAKE_CONFIGURE_EXEC=1
        export FLAKE_CONFIGURE_EXEC
        exec bash "$0" "$@"
        exec ksh "$0" "$@"
        exec /usr/xpg4/bin/sh "$0" "$@"
    fi
    echo "No compatible shell script interpreter found."
    exit 1
fi

show_help(){
  echo "Usage: configure [options]"
  echo "Options: [defaults in brackets after descriptions]"
  echo
  echo "Standard options:"
  echo "  --help                   print this message"
  echo "  --log[=FILE|yes|no]      log tests and output to FILE [config.err]"
  echo "  --prefix=PREFIX          install in PREFIX [$PREFIX]"
  echo "  --libdir=DIR             install libs in DIR [PREFIX/lib]"
  echo "  --incdir=DIR             install includes in DIR [PREFIX/include/ffmpeg]"
  echo "  --enable-mingw32         enable MinGW native/cross Windows compile"
  echo "  --enable-mingwce         enable MinGW native/cross WinCE compile"
  echo ""
  echo "Advanced options (experts only):"
  echo "  --source-path=PATH       path to source code [$source_path]"
  echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]"
  echo "  --cross-compile          assume a cross-compiler is used"
  echo "  --cc=CC                  use C compiler CC [$cc]"
  echo "  --make=MAKE              use specified make [$make]"
  echo "  --ar=AR                  use specified ar [$ar]"
  echo "  --ranlib=RANLIB          use specified ranlib [$ranlib]"
  echo "  --strip=STRIP            use specified ranlib [$strip]"
  echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]"
  echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]"
  echo "  --extra-libs=ELIBS       add ELIBS [$ELIBS]"
  echo "  --build-suffix=SUFFIX    suffix for application specific build []"
  echo "  --cpu=CPU                force cpu to CPU  [$cpu]"
  echo "  --tune=CPU               tune code for a particular CPU"
  echo "                           (may fail or perform badly on other CPUs)"
  echo "  --disable-altivec        disable AltiVec usage"
  echo "  --enable-gprof           enable profiling with gprof [$gprof]"
  echo "  --disable-debug          disable debugging symbols"
  echo "  --disable-opts           disable compiler optimizations"
  echo "  --enable-small           optimize for size instead of speed"
  echo "  --disable-strip          disable stripping of executables"
  echo ""
  echo "NOTE: Object files are built at the place where configure is launched."
  exit 1
}

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

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

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

die(){
    echolog "$@"
    cat <<EOF
If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to
justinruggles@bellsouth.net.
EOF
    if enabled logging; then
        cat <<EOF
Include the log file "$logfile" produced by configure as this will help
solving the problem.
EOF
    else
cat <<EOF
Rerun configure with logging enabled (do not use --log=no), and include the
log this produces with your report.
EOF
    fi
    rm -f $TMPC $TMPO $TMPE $TMPS $TMPH
    exit 1
}

enabled(){
    eval test "\$$1" = "yes"
}

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

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

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

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

add_cflags(){
    append CFLAGS "$@"
}

add_ldflags(){
    append LDFLAGS "$@"
}

add_extralibs(){
    append extralibs "$@"
}

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

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

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

check_ld(){
    log check_ld "$@"
    check_cc || return
    check_cmd $cc $LDFLAGS "$@" -o $TMPE $TMPO $extralibs
}

check_cflags(){
    log check_cflags "$@"
    check_cc "$@" <<EOF && add_cflags "$@"
int x;
EOF
}

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

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

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

# set temporary file name
if test ! -z "$TMPDIR" ; then
    TMPDIR1="${TMPDIR}"
elif test ! -z "$TEMPDIR" ; then
    TMPDIR1="${TEMPDIR}"
elif test ! -z "$TEMP" ; then
    TMPDIR1="${TEMP}"
else
    TMPDIR1="/tmp"
fi

TMPC="${TMPDIR1}/flake-conf-${RANDOM}-$$-${RANDOM}.c"
TMPO="${TMPDIR1}/flake-conf-${RANDOM}-$$-${RANDOM}.o"
TMPE="${TMPDIR1}/flake-conf-${RANDOM}-$$-${RANDOM}"
TMPS="${TMPDIR1}/flake-conf-${RANDOM}-$$-${RANDOM}.S"
TMPH="${TMPDIR1}/flake-conf-${RANDOM}-$$-${RANDOM}.h"

# default parameters
logging="yes"
logfile="config.err"
PREFIX="/usr/local"
libdir='${PREFIX}/lib'
incdir='${PREFIX}/include'
bindir='${PREFIX}/bin'
cross_prefix=""
cross_compile="no"
cc="gcc"
ar="ar"
ranlib="ranlib"
make="make"
strip="strip"
cpu=`uname -m`
tune="generic"
altivec="default"
case "$cpu" in
  i386|i486|i586|i686|i86pc|BePC)
    cpu="x86"
  ;;
  x86_64|amd64)
    cpu="x86"
    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 $CFLAGS | grep -- -m32`"  ]; then
        cpu="x86_64"
      fi
    fi
  ;;
  # armv4l is a subset of armv5tel
  armv4l|armv5tel)
    cpu="armv4l"
  ;;
  alpha)
    cpu="alpha"
  ;;
  "Power Macintosh"|ppc|ppc64|powerpc)
    cpu="powerpc"
  ;;
  mips|mipsel|IP*)
    cpu="mips"
  ;;
  sun4u|sparc64)
    cpu="sparc64"
  ;;
  sparc)
    cpu="sparc"
  ;;
  sh4)
    cpu="sh4"
  ;;
  parisc|parisc64)
    cpu="parisc"
  ;;
  s390|s390x)
    cpu="s390"
  ;;
  m68k)
    cpu="m68k"
  ;;
  ia64)
    cpu="ia64"
  ;;
  bfin)
    cpu="bfin"
  ;;
  *)
    cpu="unknown"
  ;;
esac
gprof="no"
mingw32="no"
mingwce="no"
os2="no"
optimize="yes"
debug="yes"
dostrip="yes"
installstrip="-s"
extralibs="-lm"
bigendian="no"
inttypes="yes"
LIBOBJFLAGS=""
PROJLDFLAGS=-Wl,--warn-common
LDCONFIG="ldconfig"
LIBPREF="lib"
LIBSUF=".a"
LIB='$(LIBPREF)$(NAME)$(LIBSUF)'
EXESUF=""
BUILDSUF=""
LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(libdir)/$(LIB)"'

# OS specific
targetos=`uname -s`
case $targetos in
BeOS)
PREFIX="/boot/home/config"
add_cflags "-DPIC -fomit-frame-pointer"
# 3 gcc releases known for BeOS, each with ugly bugs
gcc_version="`$cc -v 2>&1 | grep version | cut -d ' ' -f3-`"
case "$gcc_version" in
2.9-beos-991026*|2.9-beos-000224*) echo "R5/GG gcc"
;;
*20010315*) echo "BeBits gcc"
add_cflags "-fno-expensive-optimizations"
;;
esac
;;
SunOS)
make="gmake"
PROJLDFLAGS=""
;;
NetBSD)
make="gmake"
;;
OpenBSD)
make="gmake"
LIBOBJFLAGS="\$(PIC)"
;;
FreeBSD)
make="gmake"
add_cflags "-pthread"
;;
GNU/kFreeBSD)
add_cflags "-pthread"
;;
BSD/OS)
extralibs="-lpoll -lgnugetopt -lm"
make="gmake"
strip="strip -d"
installstrip=""
;;
Darwin)
cc="cc"
extralibs=""
strip="strip -x"
installstrip=""
PROJLDFLAGS="-Wl,-dynamic,-search_paths_first"
LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(libdir)/$(LIB)"'
;;
MINGW32*)
# Note: the rest of the mingw32 config is done afterwards as mingw32
# can be forced on the command line for Linux cross compilation.
mingw32="yes"
;;
CYGWIN*)
targetos=CYGWIN
extralibs=""
EXESUF=".exe"
;;
Linux)
;;
IRIX*)
targetos=IRIX
ranlib="echo ignoring ranlib"
make="gmake"
;;
OS/2)
TMPE=$TMPE".exe"
ar="emxomfar -p128"
ranlib="echo ignoring ranlib"
strip="echo ignoring strip"
add_cflags "-Zomf"
PROJLDFLAGS="-Zomf -Zstack 16384 -s"
LIBPREF=""
LIBSUF=".lib"
EXESUF=".exe"
extralibs=""
os2="yes"

;;
*)
targetos="${targetos}-UNKNOWN"
;;
esac

# find source path
source_path="`dirname $0`"
source_path_used="yes"
if test -z "$source_path" -o "$source_path" = "." ; then
    source_path=`pwd`
    source_path_used="no"
else
    source_path="`cd \"$source_path\"; pwd`"
fi

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

FLAKE_CONFIGURATION=" "
for opt do
  FLAKE_CONFIGURATION="$FLAKE_CONFIGURATION""$opt "
done

for opt do
  optval="${opt#*=}"
  case "$opt" in
  --log)
  ;;
  --log=*) logging="$optval"
  ;;
  --prefix=*) PREFIX="$optval"; force_prefix=yes
  ;;
  --libdir=*) libdir="$optval"; force_libdir=yes
  ;;
  --incdir=*) incdir="$optval"
  ;;
  --source-path=*) source_path="$optval"
  ;;
  --cross-prefix=*) cross_prefix="$optval"
  ;;
  --cross-compile) cross_compile=yes
  ;;
  --cc=*) cc="$optval"
  ;;
  --make=*) make="$optval"
  ;;
  --ar=*) ar="$optval"
  ;;
  --ranlib=*) ranlib="$optval"
  ;;
  --strip=*) strip="$optval"
  ;;
  --extra-cflags=*) add_cflags "$optval"
  ;;
  --extra-ldflags=*) EXTRALDFLAGS="$optval"
  ;;
  --extra-libs=*) extralibs="$optval"
  ;;
  --build-suffix=*) BUILDSUF="$optval"
  ;;
  --cpu=*) cpu="$optval"
  ;;
  --tune=*) tune="$optval"
  ;;
  --disable-altivec) altivec="no"
  ;;
  --enable-gprof) gprof="yes"
  ;;
  --enable-mingw32) mingw32="yes"
  ;;
  --enable-mingwce) mingwce="yes"
  ;;
  --disable-debug) debug="no"
  ;;
  --disable-opts) optimize="no"
  ;;
  --enable-small) optimize="small"
  ;;
  --disable-strip) dostrip="no"
  ;;
  --help) show_help
  ;;
  *)
  echo "Unknown option \"$opt\"."
  echo "See $0 --help for available options."
  exit 1
  ;;
  esac
done

if test "$logging" != no; then
    test "$logging" = yes || logfile="$logging"
    echo "# $0 $@" >$logfile
    set >>$logfile
else
    logfile=/dev/null
fi

if test "$mingw32" = "yes" -o "$mingwce" = "yes"; then
    EXESUF=".exe"
    if test "$force_prefix" != yes; then PREFIX="$PROGRAMFILES/Flake"; fi
    if test "$force_libdir" != yes; then bindir='${PREFIX}'; fi
fi

# Combine PROFLDFLAGS, EXTRALDFLAGS and the LDFLAGS environment variable.
LDFLAGS="$PROJLDFLAGS $EXTRALDFLAGS $LDFLAGS"

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

#Darwin CC versions
needmdynamicnopic="no"
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
        gcc_version="`$cc -v 2>&1 | grep version | cut -d ' ' -f3-`"
        case "$gcc_version" in
            *2.95*)
                add_cflags "-no-cpp-precomp -pipe"
                ;;
            *[34].*)
                add_cflags "-no-cpp-precomp -pipe -force_cpusubtype_ALL -Wno-sign-compare"
                needmdynamicnopic="yes"
                ;;
            *)
                add_cflags "-no-cpp-precomp -pipe"
                needmdynamicnopic="yes"
                ;;
        esac
    fi
    if test $optimize != "no"; then
        add_cflags "-fomit-frame-pointer"
    fi
fi

# Can only do AltiVec on PowerPC
if test $altivec = "default"; then
    if test $cpu = "powerpc"; then
        altivec="yes"
    else
        altivec="no"
    fi
fi

# Add processor-specific flags
TUNECPU="generic"
POWERPCMODE="32bits"
if test $tune != "generic"; then
    case $tune in
        601|ppc601|PowerPC601)
            add_cflags "-mcpu=601"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC601 but AltiVec enabled!";
            fi
            TUNECPU=ppc601
        ;;
        603*|ppc603*|PowerPC603*)
            add_cflags "-mcpu=603"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC603 but AltiVec enabled!";
            fi
            TUNECPU=ppc603
        ;;
        604*|ppc604*|PowerPC604*)
            add_cflags "-mcpu=604"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC604 but AltiVec enabled!";
            fi
            TUNECPU=ppc604
        ;;
        G3|g3|75*|ppc75*|PowerPC75*)
            add_cflags "-mcpu=750 -mtune=750 -mpowerpc-gfxopt"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC75x but AltiVec enabled!";
            fi
            TUNECPU=ppc750
        ;;
        G4|g4|745*|ppc745*|PowerPC745*)
            add_cflags "-mcpu=7450 -mtune=7450 -mpowerpc-gfxopt"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for PPC745x but AltiVec disabled!";
            fi
            TUNECPU=ppc7450
        ;;
        74*|ppc74*|PowerPC74*)
            add_cflags "-mcpu=7400 -mtune=7400 -mpowerpc-gfxopt"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for PPC74xx but AltiVec disabled!";
            fi
            TUNECPU=ppc7400
        ;;
        G5|g5|970|ppc970|PowerPC970|power4*|Power4*)
            add_cflags "-mcpu=970 -mtune=970 -mpowerpc-gfxopt -mpowerpc64"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for PPC970 but AltiVec disabled!";
            fi
            TUNECPU=ppc970
            POWERPCMODE="64bits"
        ;;
        power5*|Power5*)
            add_cflags "-mcpu=power5 -mtune=power5 -mpowerpc-gfxopt -mpowerpc64"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for POWER5 but AltiVec disabled!";
            fi
            TUNECPU=power5
            POWERPCMODE="64bits"
        ;;
        i[3456]86|pentium|pentiumpro|pentium-mmx|pentium[234]|prescott|k6|k6-[23]|athlon|athlon-tbird|athlon-4|athlon-[mx]p|winchip-c6|winchip2|c3|nocona|athlon64|k8|opteron|athlon-fx)
            add_cflags "-march=$tune"
        ;;
        ev4|ev45|ev5|ev56|ev6|ev67|21064|21164|21164a|21164pc|21164PC|21264|21264a)
            add_cflags "-mcpu=$tune"
        ;;
        sparc64)
            add_cflags "-mcpu=v9 -mtune=v9"
        ;;
        *)
        echo "WARNING: Unknown CPU \"$tune\", ignored."
        ;;
    esac
fi

# 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 "$cross_prefix" -a "$cross_compile" = no; then
        echo "If $cc is a cross-compiler, use the --cross-compile option."
    fi
    die "C compiler test failed."
fi

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

# ---
# big/little-endian test
if test "$cross_compile" = "no"; then
    check_ld <<EOF || die "endian test failed" && $TMPE && bigendian="yes"
#include <inttypes.h>
int main(int argc, char ** argv){
        volatile uint32_t i=0x01234567;
        return (*((uint8_t*)(&i))) == 0x67;
}
EOF
else
    # programs cannot be launched if cross compiling, so make a static guess
    if test "$cpu" = "powerpc" -o "$cpu" = "mips" ; then
        bigendian="yes"
    fi
fi

# ---
# *inttypes.h* test
check_header inttypes.h || inttypes=no

# test for lrintf in math.h
check_exec <<EOF && have_lrintf=yes || have_lrintf=no
#define _ISOC9X_SOURCE  1
#include <math.h>
int main( void ) { return (lrintf(3.999f) > 0)?0:1; }
EOF

# test for strnlen in string.h
check_exec <<EOF && have_strnlen=yes || have_strnlen=no
#define _ISOC9X_SOURCE  1
#include <string.h>
int main( void ) { return (strnlen("help", 6) == 4)?0:1; }
EOF

if enabled debug; then
    add_cflags -g
else
    add_cflags -DNDEBUG
fi

# 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 -Winline

# not all compilers support -Os
test "$optimize" = "small" && check_cflags -Os

if enabled optimize; then
    if test -n "`$cc -v 2>&1 | grep xlc`"; then
        add_cflags  "-O5"
        add_ldflags "-O5"
    else
        add_cflags "-O3"
    fi
fi

if test "$gprof" = "yes" ; then
    add_cflags  "-p"
    add_ldflags "-p"
fi

echo "install prefix   $PREFIX"
echo "source path      $source_path"
echo "C compiler       $cc"
echo "make             $make"
echo "CPU              $cpu ($tune)"
if test "$BUILDSUF" != ""; then
    echo "build suffix     $BUILDSUF"
fi
echo "big-endian       $bigendian"
echo "inttypes.h       $inttypes"
echo "lrintf()         $have_lrintf"
echo "strnlen()        $have_strnlen"
if test $cpu = "powerpc"; then
    echo "AltiVec enabled  $altivec"
fi
echo "gprof enabled    $gprof"
echo "debug symbols    $debug"
echo "strip symbols    $dostrip"
echo "optimize         $optimize"

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

date >> config.log
echo "   $0 $FLAKE_CONFIGURATION" >> config.log
echo "# Automatically generated by configure - do not modify!" > config.mak
echo "/* Automatically generated by configure - do not modify! */" > $TMPH
echo "#define FLAKE_CONFIGURATION "'"'"$FLAKE_CONFIGURATION"'"' >> $TMPH

echo "PREFIX=$PREFIX" >> config.mak
echo "prefix=\$(DESTDIR)\${PREFIX}" >> config.mak
echo "libdir=\$(DESTDIR)$libdir" >> config.mak
echo "incdir=\$(DESTDIR)$incdir" >> config.mak
echo "bindir=\$(DESTDIR)$bindir" >> config.mak
echo "MAKE=$make" >> config.mak
echo "CC=$cc" >> config.mak
echo "AR=$ar" >> config.mak
echo "RANLIB=$ranlib" >> config.mak
if test "$dostrip" = "yes" ; then
    echo "STRIP=$strip" >> config.mak
    echo "INSTALLSTRIP=$installstrip" >> config.mak
else
    echo "STRIP=echo ignoring strip" >> config.mak
    echo "INSTALLSTRIP=" >> config.mak
fi

test "$needmdynamicnopic" = yes && add_cflags -mdynamic-no-pic

echo "OPTFLAGS=$CFLAGS" >> config.mak
echo "LDFLAGS=$LDFLAGS" >> config.mak
echo "LDCONFIG=$LDCONFIG" >> config.mak
echo "LIBOBJFLAGS=$LIBOBJFLAGS" >> config.mak
echo "BUILDSUF=$BUILDSUF" >> config.mak
echo "LIBPREF=$LIBPREF" >> config.mak
echo "LIBSUF=\${BUILDSUF}$LIBSUF" >> config.mak
echo "LIB=$LIB" >> config.mak
echo "EXESUF=\${BUILDSUF}$EXESUF" >> config.mak

echo "#define TUNECPU $TUNECPU" >> $TMPH
if test "$bigendian" = "yes" ; then
  echo "WORDS_BIGENDIAN=yes" >> config.mak
  echo "#define WORDS_BIGENDIAN 1" >> $TMPH
fi
if test "$inttypes" != "yes" ; then
  echo "#define EMULATE_INTTYPES 1" >> $TMPH
fi
if test "$have_lrintf" = "yes" ; then
  echo "#define HAVE_LRINTF 1" >> $TMPH
fi
if test "$have_strnlen" = "yes" ; then
  echo "#define HAVE_STRNLEN 1" >> $TMPH
fi

libflake_version=`grep '#define FLAKE_VERSION ' "$source_path/libflake/flake.h" | sed 's/[^0-9\.]//g'`

echo "LIB_INSTALL_EXTRA_CMD=${LIB_INSTALL_EXTRA_CMD}" >> config.mak
echo "EXTRALIBS=$extralibs" >> config.mak

if test "$mingw32" = "yes" ; then
  echo "#ifndef __MINGW32__" >> $TMPH
  echo "#define __MINGW32__ 1" >> $TMPH
  echo "#endif" >> $TMPH
fi

if test "$mingwce" = "yes" ; then
  echo "#define CONFIG_WINCE 1" >> $TMPH
  echo "#ifndef __MINGW32__" >> $TMPH
  echo "#define __MINGW32__ 1" >> $TMPH
  echo "#endif" >> $TMPH
fi

if test "$os2" = "yes" ; then
  echo "#define CONFIG_OS2 1" >> $TMPH
fi

if test "$targetos" = "SunOS" ; then
  echo "#define CONFIG_SUNOS 1" >> $TMPH
fi

if test "$targetos" = "Darwin"; then
  echo "#define CONFIG_DARWIN 1"  >> $TMPH
fi

# build tree in object directory if source path is different from current one
if test "$source_path_used" = "yes" ; then
    DIRS="\
         libflake \
         flake \
         util \
         "
    FILES="\
          Makefile \
          libflake/Makefile \
          flake/Makefile \
          util/Makefile \
          "
    for dir in $DIRS ; do
            mkdir -p $dir
    done
    for f in $FILES ; do
        ln -sf "$source_path/$f" $f
    done
fi
echo "SRC_PATH=$source_path" >> config.mak
echo "BUILD_ROOT=$PWD" >> config.mak

# Do not overwrite config.h if unchanged to avoid superfluous rebuilds.
diff $TMPH config.h >/dev/null 2>&1
if test "$?" != "0" ; then
        mv -f $TMPH config.h
else
        echo "config.h is unchanged"
fi

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