# This software is released under the terms of GPLv2 by copyright@mzpqnxow.com
# Please see LICENSE or LICENSE.md for more information on GPLv2

#
# YMMV, but this worked reliably for me. However, it ONLY worked reliably
# when using a prebuilt toolchain from the OpenWrt project. It seems to
# not work well when building your own. It's possible I just didn't use a
# suffix setting or something else that this script relies on. So just to
# reiterate: **use this only with the OpenWrt-Toolchain-xxx-yyy*.tar.bz2
# prebuilt toolchains from OpenWrt.org or all bets are off!**
#

#
# This is not for you unless you are using a pre-built OpenWRT toolchain
# This is a productivity script that should be sourced from a Bash shell
#
# It is meant to be used after unpacking pre-built OpenWrt toolchains, which
# are named like this:
#
# 	OpenWrt-Toolchain-xxx-yyy-5.3.0_musl-1.1.16.Linux-x86_64.tar.bz2
#
# A huge collection of them can be found at the following location:
#
#	https://downloads.openwrt.org/snapshots/trunk/
#
# This file should be placed in /path/to/installed/toolchain/
# The file must be in the root directory of the subdirectory of the unpacked
# toolchain - NOT the directory that contains the LICENSE file, but the main
# directory under that
#
# You can name the script whatever you want, I prefer to call it 'activate'
# All you need to do is source it (from any working directory) and it will set
# your environment up for building software via build systems like configure
# as well as for manual invocation via gcc, ld, etc. It helps with static
# linking by setting some static library locations as environment variables
# as well
#
# Assumptions are made, YMMV. It works well for me when I work on weird stuff
#

CURDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source "$CURDIR/info.mk"
TOOLCHAIN_TARGET="$TARGET_CROSS"
TOOLCHAIN_ROOT="$CURDIR"

# Commonly used/needed static libraries, put them in the
# environment for easy access
UTIL_STATIC=$(find $(realpath $CURDIR) -name libutil.a)
C_STATIC=$(find $(realpath $CURDIR) -name libc.a)
DL_STATIC=$(find $(realpath $CURDIR) -name libdl.a)
PTHREAD_STATIC=$(find $(realpath $CURDIR) -name libpthread.a)
STDCXX_STATIC=$(find $(realpath $CURDIR) -name libstdc++.a)
GCCEH_STATIC=$(find $(realpath $CURDIR) -name libgcc_eh.a)
TOOLCHAIN_BIN="$CURDIR/bin"
GCC_BIN=$TOOLCHAIN_BIN/$CUR${TOOLCHAIN_TARGET}-gcc
AS_BIN=$TOOLCHAIN_BIN/${TOOLCHAIN_TARGET}-as
LD_BIN=$TOOLCHAIN_BIN/${TOOLCHAIN_TARGET}-ld
GXX_BIN=$TOOLCHAIN_BIN/${TOOLCHAIN_TARGET}-g++
PATH="$TOOLCHAIN_BIN":"$PATH"
STAGING_DIR="$CURDIR"
TOOLCHAIN_TARGET=$(echo $TOOLCHAIN_TARGET | sed -e 's/-$//')

echo "--- Build environment setup ---"
echo
echo "TOOLCHAIN_TARGET: $TOOLCHAIN_TARGET"
echo "TOOLCHAIN_BIN: 	$TOOLCHAIN_BIN"
echo
for TOOL in gcc \
			addr2line \
			ar \
			as \
			c++ \
			cpp \
			g++ \
			gcc  \
			ld \
			nm \
			objdump \
			ranlib \
			strip
do
    echo "  Symlinking $TOOL"
    ln -sf "${TOOLCHAIN_BIN}/${TOOLCHAIN_TARGET}-${TOOL}" "${TOOLCHAIN_BIN}/${TOOL}"
done
ln -sf "${TOOLCHAIN_BIN}/${TOOLCHAIN_TARGET}-gcc" "${TOOLCHAIN_BIN}/cc"
echo

export STAGING_DIR="$TOOLCHAIN_ROOT"

PATH="$TOOLCHAIN_BIN":"$PATH"
echo "TOOLCHAIN_TARGET: 	$TOOLCHAIN_TARGET"
echo "TOOLCHAIN_ROOT:	$TOOLCHAIN_ROOT"
echo "STAGING_DIR:		$TOOLCHAIN_ROOT"
echo "TOOLCHAIN_BIN: 	$TOOLCHAIN_BIN"
echo
echo "GCC location: $(which gcc)"
echo "GAS location: $(which as)"
echo "GLD location: $(which ld)"
echo "G++ location: $(which g++)"
echo "CC location:  $(which cc)"

echo
echo "UTIL_STATIC:      $UTIL_STATIC"
echo "C_STATIC:         $C_STATIC"
echo "DL_STATIC:        $DL_STATIC"
echo "PTHREAD_STATIC:   $PTHREAD_STATIC"
echo "STDCXX_STATIC:    $STDCXX_STATIC"
echo "GCCEH_STATIC:     $GCCEH_STATIC"

alias cross_configure="./configure \
	--host=$TOOLCHAIN_TARGET \
	--prefix=$TOOLCHAIN_ROOT"

echo
echo "Use cross_configure to invoke alias for:"
echo "  $./configure --host=$TOOLCHAIN_TARGET --prefix=$TOOLCHAIN_ROOT"
echo
unset TARGET_CROSS
export UTIL_STATIC
export C_STATIC
export DL_STATIC
export PTHREAD_STATIC
export STDCXX_STATIC
export GCCEH_STATIC
export TOOLCHAIN_TARGET
export TOOLCHAIN_ROOT
export TOOLCHAIN_BIN
export STAGING_DIR
export SYSTEM_ROOT="$TOOLCHAIN_ROOT"