#!/bin/sh

unset arch cross target cc ar strip tp lto

commanddir=/sbin

servicedir=/sbin/service

networkdir=/sbin/network

systemdir=/sbin/system

man1dir=/sman/man1

man5dir=/sman/man5

man8dir=/sman/man8

cflags=-Os

die() { echo "$@" >&2; exit 1; }

while [ $# -gt 0 ]; do

case "$1" in

*dir=*) eval "$1" ;;

cross=*) eval "$1"; cross="${cross}-" ;;

target=*) eval "$1"; cross="${cross:-$target-}" ;;

arch=*) eval "$1" ;;

cc=*) eval "$1" ;;

ar=*) eval "$1" ;;

strip=*) eval "$1" ;;

clang) clang=yes ;;

devel) cflags="-Wall -g -DDEVEL" ;;

debug) cflags="-Os -g" ;;

wextra) cflags="$cflags -Wextra" ;;

werror) cflags="$cflags -Werror" ;;

lto) lto="-flto " ;;

qemu=*) eval "$1" ;;

only) shift; only="$@"; break ;;

*) die "Unexpected argument $1" ;;

esac; shift

done

test -z "$ar" && ar="${cross}ar"

test -z "$strip" && strip="${cross}strip"

if [ -n "$clang" -a -z "$cc" ]; then

cc="clang${target:+ --target=$target}"

elif [ -z "$cc" ]; then

cc="${cross}gcc"

fi

if [ -z "$arch" ]; then

mach=`$cc -dumpmachine`

mach=${mach%%-*}

case "$mach" in

mips64el) arch=mips64 ;;

mipsn32) arch=mips32 ;;

mipsn32el) arch=mips32 ;;

mipsel) arch=mips ;;

*) arch="$mach"

esac

test -n "$arch" || die "Cannot determine target arch"

test -d "lib/arch/$arch" || die "Unsupported arch $arch"

fi

# Default meaning of qemu=something is to use qemu-something,

# however it's qemu=/path/to/qemu-blah than use that unchanged.

if [ -z "$qemu" ]; then

host=`uname -m`

if [ "$host" != "$mach" ]; then

qemu="$mach"

else

qemu="-"

fi

fi

case "$qemu" in

-) qemu='' ;;

*-*) ;;

*/*) ;;

*) qemu="qemu-$qemu" ;;

esac

cat > config.mk <<END

ARCH = $arch

CC = \$/mini-cc

AR = $ar

LD = \$(CC)

AS = \$(CC)

STRIP = $strip

QEMU = $qemu

commanddir = $commanddir

servicedir = $servicedir

networkdir = $networkdir

systemdir = $systemdir

man1dir = $man1dir

man5dir = $man5dir

man8dir = $man8dir

only = $only

END

cat > mini-cc <<END

#!/bin/sh

case "\$0" in

*/*) base=\${0%/*} ;;

*) echo "\$0 may not be called from PATH" >&2; exit 1 ;;

esac

needslib=yes

for _ in "\$@"; do

case "\$_" in

-c|-E|-S) unset needslib ;;

esac

done

END

# GCC may be configured to produce PIEs without explicit -pie options,

# and it would do so even if given -ffreestanding -static. This is not

# acceptable for minibase, so the code below tries to force non-PIE mode.

if [ -n "$clang" ]; then

cat >> mini-cc <<END

exec $cc -ffreestanding \\

-fno-asynchronous-unwind-tables -fno-stack-protector -fno-vectorize \\

-static -nopie -fno-pic -fno-plt $lto \\

-nostdinc -I\$base/lib/arch/$arch -I\$base/lib -MD \\

-Wno-unused-command-line-argument -Wno-gnu \\

$cflags "\$@" \\

-nostdlib \${needslib:+\$base/lib/all.a}

END

else

cat >> mini-cc <<END

exec $cc -ffreestanding \\

-fno-asynchronous-unwind-tables -fno-stack-protector \\

-static -fno-pie -fno-PIE -fno-pic -fno-PIC $lto \\

-nostdinc -I\$base/lib/arch/$arch -I\$base/lib -MD \\

$cflags "\$@" \\

-nostdlib -Wl,-\\( \${needslib:+\$base/lib/all.a -lgcc} -Wl,-\\)

END

fi

chmod a+x mini-cc