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#!/bin/sh

msg() {
    echo "configure: $1"
}

step_msg() {
    msg
    msg "$1"
    msg
}

warn() {
    echo "configure: WARNING: $1"
}

err() {
    echo "configure: error: $1"
    exit 1
}

need_ok() {
    if [ $? -ne 0 ]
    then
err $1
    fi
}

need_cmd() {
    if which $1 >/dev/null 2>&1
    then msg "found $1"
    else err "need $1"
    fi
}

make_dir() {
    if [ ! -d $1 ]
    then
msg "mkdir -p $1"
        mkdir -p $1
    fi
}

copy_if_changed() {
    if cmp -s $1 $2
    then
msg "leaving $2 unchanged"
    else
msg "cp $1 $2"
        cp -f $1 $2
        chmod u-w $2 # make copied artifact read-only
    fi
}

move_if_changed() {
    if cmp -s $1 $2
    then
msg "leaving $2 unchanged"
    else
msg "mv $1 $2"
        mv -f $1 $2
        chmod u-w $2 # make moved artifact read-only
    fi
}

putvar() {
    local T
    eval T=\$$1
    eval TLEN=\${#$1}
    if [ $TLEN -gt 35 ]
    then
printf "configure: %-20s := %.35s ...\n" $1 "$T"
    else
printf "configure: %-20s := %s %s\n" $1 "$T" "$2"
    fi
printf "%-20s := %s\n" $1 "$T" >>config.tmp
}

probe() {
    local V=$1
    shift
local P
    local T
    for P
    do
T=$(which $P 2>&1)
        if [ $? -eq 0 ]
        then
VER0=$($P --version 2>/dev/null | head -1 \
                | sed -e 's/[^0-9]*\([vV]\?[0-9.]\+[^ ]*\).*/\1/' )
            if [ $? -eq 0 -a "x${VER0}" != "x" ]
            then
VER="($VER0)"
            else
VER=""
            fi
break
else
VER=""
            T=""
        fi
done
eval $V=\$T
    putvar $V "$VER"
}

probe_need() {
    local V=$1
    probe $*
    eval VV=\$$V
    if [ -z "$VV" ]
    then
err "needed, but unable to find any of: $*"
    fi
}

valopt() {
    local OP=$1
    local DEFAULT=$2
    shift
shift
local DOC="$*"
    if [ $HELP -eq 0 ]
    then
local UOP=$(echo $OP | tr '[:lower:]' '[:upper:]' | tr '\-' '\_')
        local V="CFG_${UOP}"
        eval $V="$DEFAULT"
        for arg in $CFG_CONFIGURE_ARGS
        do
if echo "$arg" | grep -q -- "--$OP="
            then
val=$(echo "$arg" | cut -f2 -d=)
                eval $V=$val
            fi
done
putvar $V
    else
if [ -z "$DEFAULT" ]
        then
DEFAULT="<none>"
        fi
OP="${OP}=[${DEFAULT}]"
        printf " --%-30s %s\n" "$OP" "$DOC"
    fi
}

opt() {
    local OP=$1
    local DEFAULT=$2
    shift
shift
local DOC="$*"
    local FLAG=""

    if [ $DEFAULT -eq 0 ]
    then
FLAG="enable"
    else
FLAG="disable"
        DOC="don't $DOC"
    fi

if [ $HELP -eq 0 ]
    then
for arg in $CFG_CONFIGURE_ARGS
        do
if [ "$arg" = "--${FLAG}-${OP}" ]
            then
OP=$(echo $OP | tr 'a-z-' 'A-Z_')
                FLAG=$(echo $FLAG | tr 'a-z' 'A-Z')
                local V="CFG_${FLAG}_${OP}"
                eval $V=1
                putvar $V
            fi
done
else
if [ ! -z "$META" ]
        then
OP="$OP=<$META>"
        fi
printf " --%-30s %s\n" "$FLAG-$OP" "$DOC"
     fi
}

msg "looking for configure programs"
need_cmd cmp
need_cmd mkdir
need_cmd printf
need_cmd cut
need_cmd grep
need_cmd xargs
need_cmd cp
need_cmd find
need_cmd uname
need_cmd date
need_cmd tr
need_cmd sed


msg "inspecting environment"

CFG_OSTYPE=$(uname -s)
CFG_CPUTYPE=$(uname -m)

if [ $CFG_OSTYPE = Darwin -a $CFG_CPUTYPE = i386 ]
then
    # Darwin's `uname -s` lies and always returns i386. We have to use sysctl
    # instead.
    if sysctl hw.optional.x86_64 | grep -q ': 1'
    then
CFG_CPUTYPE=x86_64
    fi
fi

# The goal here is to come up with the same triple as LLVM would,
# at least for the subset of platforms we're willing to target.

case $CFG_OSTYPE in

    Linux)
        CFG_OSTYPE=unknown-linux-gnu
        ;;

    FreeBSD)
        CFG_OSTYPE=unknown-freebsd
        ;;

    Darwin)
        CFG_OSTYPE=apple-darwin
        ;;

    MINGW32*)
        CFG_OSTYPE=pc-mingw32
        ;;

    *)
        err "unknown OS type: $CFG_OSTYPE"
        ;;
esac


case $CFG_CPUTYPE in

    i386 | i486 | i686 | i786 | x86)
        CFG_CPUTYPE=i686
        ;;

    xscale | arm)
        CFG_CPUTYPE=arm
        ;;

    x86_64 | x86-64 | x64 | amd64)
        CFG_CPUTYPE=x86_64
        ;;

    *)
        err "unknown CPU type: $CFG_CPUTYPE"
esac

DEFAULT_HOST_TRIPLE="${CFG_CPUTYPE}-${CFG_OSTYPE}"

CFG_SRC_DIR="$(cd $(dirname $0) && pwd)/"
CFG_BUILD_DIR="$(pwd)/"
CFG_SELF=${CFG_SRC_DIR}$(basename $0)
CFG_CONFIGURE_ARGS="$@"

OPTIONS=""
HELP=0
if [ "$1" = "--help" ]
then
HELP=1
    shift
echo ""
    echo "Usage: $CFG_SELF [options]"
    echo ""
    echo "Options:"
    echo ""
else
msg "recreating config.tmp"
    echo '' >config.tmp

    step_msg "processing $CFG_SELF args"
fi

opt sharedstd 1 "build libstd as a shared library"
opt valgrind 1 "run tests with valgrind (memcheck by default)"
opt helgrind 0 "run tests with helgrind instead of memcheck"
opt docs 1 "build documentation"
opt optimize 1 "build optimized rust code"
opt optimize-cxx 1 "build optimized C++ code"
opt optimize-llvm 1 "build optimized LLVM"
opt debug 0 "build with extra debug fun"
opt fast-make 0 "use .gitmodules as timestamp for submodule deps"
opt manage-submodules 1 "let the build manage the git submodules"
opt mingw-cross 0 "cross-compile for win32 using mingw"
opt clang 0 "prefer clang to gcc for building the runtime"
opt local-rust 0 "use an installed rustc rather than downloading a snapshot"
opt pax-flags 0 "apply PaX flags to rustc binaries (required for GRSecurity/PaX-patched kernels)"
valopt prefix "/usr/local" "set installation prefix"
valopt local-rust-root "/usr/local" "set prefix for local rust binary"
valopt llvm-root "" "set LLVM root"
valopt host-triple "${DEFAULT_HOST_TRIPLE}" "LLVM host triple"
valopt target-triples "${CFG_HOST_TRIPLE}" "LLVM target triples"

if [ $HELP -eq 1 ]
then
echo ""
    exit 0
fi


step_msg "looking for build programs"

probe_need CFG_PERL perl
probe_need CFG_CURL curl
probe_need CFG_PYTHON python2.7 python2.6 python2 python

python_version=$($CFG_PYTHON -V 2>&1)
if [ $(echo $python_version | grep -c '^Python 2\.[4567]') -ne 1 ]; then
err "Found $python_version, but LLVM requires Python 2.4-2.7"
fi

# If we have no git directory then we are probably a tarball distribution
# and shouldn't attempt to load submodules
if [ ! -e ${CFG_SRC_DIR}.git ]
then
probe CFG_GIT git
    msg "git: no git directory. disabling submodules"
    CFG_DISABLE_MANAGE_SUBMODULES=1
else
probe_need CFG_GIT git
fi

probe CFG_CLANG clang++
probe CFG_GCC gcc
probe CFG_LD ld
probe CFG_LLVM_CONFIG llvm-config
probe CFG_VALGRIND valgrind
probe CFG_PERF perf
probe CFG_ISCC iscc
probe CFG_LLNEXTGEN LLnextgen
probe CFG_PANDOC pandoc
probe CFG_PDFLATEX pdflatex
probe CFG_XETEX xetex
probe CFG_LUATEX luatex
probe CFG_NODE nodejs node
if [ "$CFG_OSTYPE" = "unknown-linux-gnu" ]
then
probe CFG_PAXCTL paxctl /sbin/paxctl
    probe CFG_ZCAT zcat
fi

if [ ! -z "$CFG_PANDOC" ]
then
PV=$(pandoc --version | awk '/^pandoc/ {print $2}')
    if [ "$PV" \< "1.8" ]
    then
step_msg "pandoc $PV is too old. disabling"
BAD_PANDOC=1
    fi
fi

if [ "$CFG_OSTYPE" = "unknown-linux-gnu" ]
then
if [ ! -z "$CFG_ENABLE_PAX_FLAGS" -a -z "$CFG_PAXCTL" ]
    then
err "enabled PaX markings but no paxctl binary found"
    fi

if [ -z "$CFG_DISABLE_PAX_FLAGS" ]
    then
        # GRSecurity/PaX detection. This can be very flaky.
        GRSEC_DETECTED=

        # /dev/grsec only exists if CONFIG_GRKERNSEC_NO_RBAC is not set.
        # /proc/sys/kernel/grsecurity is not available if ÇONFIG_GRKERNSEC_SYSCTL is not set.
        if [ -e /dev/grsec -o -d /proc/sys/kernel/grsecurity ]
        then
GRSEC_DETECTED=1
        # /proc/config.gz is normally only available to root, and only if CONFIG_IKCONFIG_PROC has been set.
        elif [ -r /proc/config.gz -a ! -z "$CFG_ZCAT" ]
        then
if "$CFG_ZCAT" /proc/config.gz | grep --quiet "CONFIG_GRKERNSEC=y"
            then
GRSEC_DETECTED=1
            fi
        # Flaky.
        elif grep --quiet grsec /proc/version
        then
GRSEC_DETECTED=1
        fi

if [ ! -z "$GRSEC_DETECTED" ]
        then
step_msg "GRSecurity: yes"
            if [ ! -z "$CFG_PAXCTL" ]
            then
CFG_ENABLE_PAX_FLAGS=1
            else
warn "GRSecurity kernel detected but no paxctl binary found: not setting CFG_ENABLE_PAX_FLAGS"
            fi
else
step_msg "GRSecurity: no"
        fi
fi
fi

if [ ! -z "$CFG_ENABLE_LOCAL_RUST" ]
then
if [ ! -f ${CFG_LOCAL_RUST_ROOT}/bin/rustc ]
    then
err "no local rust to use"
    else
LRV=`${CFG_LOCAL_RUST_ROOT}/bin/rustc --version`
        step_msg "using rustc at: ${CFG_LOCAL_RUST_ROOT} with version: " $LRV
    fi
fi

if [ -z "$CFG_ENABLE_CLANG" -a -z "$CFG_GCC" ]
then
err "either clang or gcc is required"
fi

if [ ! -z "$CFG_LLVM_ROOT" -a -e "$CFG_LLVM_ROOT/bin/llvm-config" ]
then
step_msg "using custom LLVM at $CFG_LLVM_ROOT"

    LLVM_CONFIG="$CFG_LLVM_ROOT/bin/llvm-config"
    LLVM_VERSION=$($LLVM_CONFIG --version)

    case $LLVM_VERSION in
(3.1svn|3.1|3.0svn|3.0)
msg "found ok version of LLVM: $LLVM_VERSION"
;;
(*)
err "bad LLVM version: $LLVM_VERSION, need >=3.0svn"
;;
    esac
fi

if [ ! -z "$CFG_ENABLE_CLANG" ]
then
if [ -z "$CFG_CLANG" ]
    then
err "clang requested but not found"
    fi
CFG_CLANG_VERSION=$("$CFG_CLANG" \
                      --version \
                      | grep version \
                      | sed 's/.*\(version .*\)/\1/' \
                      | cut -d ' ' -f 2)

    case $CFG_CLANG_VERSION in
        (3.0svn | 3.0 | 3.1 | 4.0 | 4.1)
        step_msg "found ok version of CLANG: $CFG_CLANG_VERSION"
        CFG_C_COMPILER="clang"
        ;;
        (*)
        err "bad CLANG version: $CFG_CLANG_VERSION, need >=3.0svn"
        ;;
    esac
else
CFG_C_COMPILER="gcc"
fi

# a little post-processing of various config values

CFG_PREFIX=${CFG_PREFIX%/}
CFG_TARGET_TRIPLES="$(echo $CFG_TARGET_TRIPLES | tr ',' ' ')"
case $CFG_TARGET_TRIPLES in
    (*$CFG_HOST_TRIPLE*) ;;
    (*) err "Host triple is not among the target triples." ;;
esac

if [ -z "$CFG_ENABLE_CLANG" -a -z "$CFG_GCC" ]
then
err "either clang or gcc is required"
fi

if [ ! -z "$CFG_PERF" ]
then
HAVE_PERF_LOGFD=`$CFG_PERF stat --log-fd 2>&1 | grep 'unknown option'`
    if [ -z "$HAVE_PERF_LOGFD" ];
    then
CFG_PERF_WITH_LOGFD=1
        putvar CFG_PERF_WITH_LOGFD
    fi
fi

step_msg "making directories"

for i in \
    doc doc/core doc/std \
    dl tmp
do
make_dir $i
done

make_dir llvm
for t in $CFG_TARGET_TRIPLES
do
make_dir llvm/$t
done

make_dir rustllvm
for t in $CFG_TARGET_TRIPLES
do
make_dir rustllvm/$t
done

make_dir rt
for t in $CFG_TARGET_TRIPLES
do
make_dir rt/$t
  for i in \
    isaac bigint sync test arch/i386 arch/x86_64 \
    libuv libuv/src/ares libuv/src/eio libuv/src/ev
  do
make_dir rt/$t/$i
  done
done

# On windows we just store the libraries in the bin directory because
# there's no rpath
CFG_LIBDIR=lib
if [ "$CFG_OSTYPE" = "pc-mingw32" ]
then
CFG_LIBDIR=bin
fi

for h in $CFG_TARGET_TRIPLES
do
for t in $CFG_TARGET_TRIPLES
    do
for i in 0 1 2 3
        do
            # host bin dir
            make_dir $h/stage$i/bin

            # host lib dir
            make_dir $h/stage$i/$CFG_LIBDIR

            # target bin dir
            make_dir $h/stage$i/$CFG_LIBDIR/rustc/$t/bin

            # target lib dir
            make_dir $h/stage$i/$CFG_LIBDIR/rustc/$t/$CFG_LIBDIR
        done
done

make_dir $h/test/run-pass
    make_dir $h/test/run-pass-fulldeps
    make_dir $h/test/run-fail
    make_dir $h/test/compile-fail
    make_dir $h/test/bench
    make_dir $h/test/perf
    make_dir $h/test/pretty
    make_dir $h/test/doc-tutorial
    make_dir $h/test/doc-tutorial-ffi
    make_dir $h/test/doc-tutorial-macros
    make_dir $h/test/doc-tutorial-borrowed-ptr
    make_dir $h/test/doc-tutorial-tasks
    make_dir $h/test/doc-ref
done

# Configure submodules
step_msg "configuring submodules"

# Have to be in the top of src directory for this
if [ -z $CFG_DISABLE_MANAGE_SUBMODULES ]
then
cd ${CFG_SRC_DIR}

    msg "git: submodule sync"
    "${CFG_GIT}" submodule --quiet sync

    msg "git: submodule update"
    "${CFG_GIT}" submodule --quiet update --init
    need_ok "git failed"

    msg "git: submodule foreach sync"
    "${CFG_GIT}" submodule --quiet foreach --recursive git submodule sync
    need_ok "git failed"

    msg "git: submodule foreach update"
    "${CFG_GIT}" submodule --quiet update --init --recursive
    need_ok "git failed"

    # NB: this is just for the sake of getting the submodule SHA1 values
    # and status written into the build log.
    msg "git: submodule status"
    "${CFG_GIT}" submodule status --recursive

    msg "git: submodule clobber"
    "${CFG_GIT}" submodule --quiet foreach --recursive git clean -dxf
    need_ok "git failed"
    "${CFG_GIT}" submodule --quiet foreach --recursive git checkout .
    need_ok "git failed"

    cd ${CFG_BUILD_DIR}
fi

# Configure llvm, only if necessary
step_msg "looking at LLVM"
CFG_LLVM_SRC_DIR=${CFG_SRC_DIR}src/llvm/
for t in $CFG_TARGET_TRIPLES
do
do_reconfigure=1

    if [ -z $CFG_LLVM_ROOT ]
    then
LLVM_BUILD_DIR=${CFG_BUILD_DIR}llvm/$t
        if [ ! -z "$CFG_DISABLE_OPTIMIZE_LLVM" ]
        then
LLVM_DBG_OPTS=""
            # Just use LLVM straight from its build directory to
            # avoid 'make install' time
            LLVM_INST_DIR=$LLVM_BUILD_DIR/Debug+Asserts
        else
LLVM_DBG_OPTS="--enable-optimized"
            LLVM_INST_DIR=$LLVM_BUILD_DIR/Release+Asserts
        fi
else
msg "not reconfiguring LLVM, external LLVM root"
        # The user is using their own LLVM
        LLVM_BUILD_DIR=
        LLVM_INST_DIR=$CFG_LLVM_ROOT
        do_reconfigure=0
    fi


if [ ${do_reconfigure} -ne 0 ]
    then
    # because git is hilarious, it might have put the module index
    # in a couple places.
        index1="${CFG_SRC_DIR}.git/modules/src/llvm/index"
        index2="${CFG_SRC_DIR}src/llvm/.git/index"
        for index in ${index1} ${index2}
        do
config_status="${CFG_BUILD_DIR}llvm/$t/config.status"
            if test -e ${index} -a \
                    -e ${config_status} -a \
                    ${config_status} -nt ${index}
            then
msg "not reconfiguring LLVM, config.status is fresh"
                do_reconfigure=0
            fi
done
fi

if [ ${do_reconfigure} -ne 0 ]
    then
msg "configuring LLVM for $t"

        LLVM_TARGETS="--enable-targets=x86,x86_64"
        LLVM_BUILD="--build=$t"
        LLVM_HOST="--host=$t"
        LLVM_TARGET="--target=$t"

        # Disable unused LLVM features
        LLVM_OPTS="$LLVM_DBG_OPTS --disable-docs \
--enable-bindings=none --disable-threads \
--disable-pthreads"

        if [ "$CFG_C_COMPILER" = "clang" ]
        then
LLVM_CXX_32="clang++ -m32"
            LLVM_CC_32="clang -m32"

            LLVM_CXX_64="clang++"
            LLVM_CC_64="clang"
        else
LLVM_CXX_32="g++ -m32"
            LLVM_CC_32="gcc -m32"

            LLVM_CXX_64="g++"
            LLVM_CC_64="gcc"
        fi

LLVM_CFLAGS_32="-m32"
        LLVM_CXXFLAGS_32="-m32"
        LLVM_LDFLAGS_32="-m32"

        LLVM_CFLAGS_64=""
        LLVM_CXXFLAGS_64=""
        LLVM_LDFLAGS_64=""

        if echo $t | grep -q x86_64
        then
LLVM_CXX=$LLVM_CXX_64
            LLVM_CC=$LLVM_CC_64
            LLVM_CFLAGS=$LLVM_CFLAGS_64
            LLVM_CXXFLAGS=$LLVM_CXXFLAGS_64
            LLVM_LDFLAGS=$LLVM_LDFLAGS_64
        else
LLVM_CXX=$LLVM_CXX_32
            LLVM_CC=$LLVM_CC_32
            LLVM_CFLAGS=$LLVM_CFLAGS_32
            LLVM_CXXFLAGS=$LLVM_CXXFLAGS_32
            LLVM_LDFLAGS=$LLVM_LDFLAGS_32
        fi

CXX=$LLVM_CXX
        CC=$LLVM_CC
        CFLAGS=$LLVM_CFLAGS
        CXXFLAGS=$LLVM_CXXFLAGS
        LDFLAGS=$LLVM_LDFLAGS

        LLVM_FLAGS="$LLVM_TARGETS $LLVM_OPTS $LLVM_BUILD \
$LLVM_HOST $LLVM_TARGET"

        msg "configuring LLVM with:"
        msg "$LLVM_FLAGS"

        export CXX
        export CC
        export CFLAGS
        export CXXFLAGS
        export LDFLAGS

        cd $LLVM_BUILD_DIR
        case $CFG_SRC_DIR in
            /* | [a-z]:* | [A-Z]:*)
                ${CFG_LLVM_SRC_DIR}configure $LLVM_FLAGS
                ;;
            *)
                ${CFG_BUILD_DIR}${CFG_LLVM_SRC_DIR}configure \
                    $LLVM_FLAGS
                ;;
        esac
need_ok "LLVM configure failed"
        cd $CFG_BUILD_DIR
    fi

    # Construct variables for LLVM build and install directories for
    # each target. These will be named
    # CFG_LLVM_BUILD_DIR_${target_triple} but all the hyphens in
    # target_triple will be converted to underscore, because bash
    # variables can't contain hyphens. The makefile will then have to
    # convert back.
    CFG_LLVM_BUILD_DIR=$(echo CFG_LLVM_BUILD_DIR_${t} | tr - _)
    CFG_LLVM_INST_DIR=$(echo CFG_LLVM_INST_DIR_${t} | tr - _)
    eval ${CFG_LLVM_BUILD_DIR}="'$LLVM_BUILD_DIR'"
    eval ${CFG_LLVM_INST_DIR}="'$LLVM_INST_DIR'"
done


step_msg "writing configuration"

putvar CFG_SRC_DIR
putvar CFG_BUILD_DIR
putvar CFG_OSTYPE
putvar CFG_CPUTYPE
putvar CFG_CONFIGURE_ARGS
putvar CFG_PREFIX
putvar CFG_TARGET_TRIPLES
putvar CFG_C_COMPILER
putvar CFG_LIBDIR
putvar CFG_DISABLE_MANAGE_SUBMODULES

if [ ! -z "$CFG_ENABLE_PAX_FLAGS" ]
then
putvar CFG_ENABLE_PAX_FLAGS
    putvar CFG_PAXCTL
fi

if [ ! -z $BAD_PANDOC ]
then
CFG_PANDOC=
    putvar CFG_PANDOC
fi

if head -n 1 ${CFG_SRC_DIR}src/snapshots.txt | grep -q '^T'
then
CFG_IN_TRANSITION=1
    putvar CFG_IN_TRANSITION
fi

# Valgrind is only reliable on Linux. On Windows it doesn't work at all, and
# on the Mac the dynamic linker causes Valgrind to emit a huge stream of
# errors.
if [ $CFG_OSTYPE != unknown-linux-gnu ] && [ $CFG_OSTYPE != apple-darwin ]
then
CFG_BAD_VALGRIND=1
    putvar CFG_BAD_VALGRIND
fi

putvar CFG_LLVM_ROOT
putvar CFG_LLVM_SRC_DIR

for t in $CFG_TARGET_TRIPLES
do
CFG_LLVM_BUILD_DIR=$(echo CFG_LLVM_BUILD_DIR_${t} | tr - _)
    CFG_LLVM_INST_DIR=$(echo CFG_LLVM_INST_DIR_${t} | tr - _)
    putvar $CFG_LLVM_BUILD_DIR
    putvar $CFG_LLVM_INST_DIR
done

# Munge any paths that appear in config.mk back to posix-y
perl -i.bak -p -e 's@ ([a-zA-Z]):[/\\]@ /\1/@go;' \
               -e 's@\\@/@go;' config.tmp
rm -f config.tmp.bak

msg
copy_if_changed ${CFG_SRC_DIR}Makefile.in ./Makefile
move_if_changed config.tmp config.mk
rm -f config.tmp
touch config.stamp

step_msg "complete"
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