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#!/bin/bash
# Copyright 2006 Michael Mohr with modifications by Roger Dingledine
# See LICENSE for licensing information.
#######################################################################
# Tor-cross: a tool to help cross-compile Tor
#
# The purpose of a cross-compiler is to produce an executable for
# one system (CPU) on another. This is useful, for example, when
# the target system does not have a native compiler available.
# You might, for example, wish to cross-compile a program on your
# host (the computer you're working on now) for a target such as
# a router or handheld computer.
#
# A number of environment variables must be set in order for this
# script to work:
# $PREFIX, $CROSSPATH, $HOST_TRIPLET, $HOST,
# and (optionally) $BUILD
# Please run the script for a description of each one. If automated
# builds are desired, the above variables can be exported at the top
# of this script.
#
# Recent releases of Tor include test programs in configure. Normally
# this is a good thing, since it catches a number of problems.
# However, this also presents a problem when cross compiling, since
# you can't run binary images for the target system on the host.
#
# Tor-cross assumes that you know what you're doing and removes a
# number of checks known to cause problems with this process.
# Note that this does not guarantee that the program will run or
# even compile; it simply allows configure to generate the Makefiles.
#
# Stripping the binaries should almost always be done for an
# embedded environment where space is at an exacting premium.
# However, the default is NOT to strip them since they are useful for
# debugging. If you do not plan to do any debugging and you
# don't care about the debugging symbols, set $STRIP to "yes" before
# running this script.
#
# Tor-cross was written by Michael Mohr. He can be contacted at
# m(dot)mohr(at)laposte(dot)net. Comments are appreciated, but
# flames go to /dev/null.
#
# The target with which this script is tested is little-endian
# MIPS Linux, built on an Athlon-based Linux desktop.
#
#######################################################################
# disable the platform-specific tests in configure
export CROSS_COMPILE=yes
# for error conditions
EXITVAL=0
if [ ! -f autogen.sh ]
then
echo "Please run this script from the root of the Tor distribution"
exit -1
fi
if [ ! -f configure ]
then
if [ -z $GEN_BUILD ]
then
echo "To automatically generate the build environment, set \$GEN_BUILD"
echo "to yes; for example,"
echo " export GEN_BUILD=yes"
EXITVAL=-1
fi
fi
if [ -z $PREFIX ]
then
echo "You must define \$PREFIX since you are cross-compiling."
echo "Select a non-system location (i.e. /tmp/tor-cross):"
echo " export PREFIX=/tmp/tor-cross"
EXITVAL=-1
fi
if [ -z $CROSSPATH ]
then
echo "You must define the location of your cross-compiler's"
echo "directory using \$CROSSPATH; for example,"
echo " export CROSSPATH=/opt/cross/staging_dir_mipsel/bin"
EXITVAL=-1
fi
if [ -z $HOST_TRIPLET ]
then
echo "You must define \$HOST_TRIPLET to continue. For example,"
echo "if you normally cross-compile applications using"
echo "mipsel-linux-uclibc-gcc, you would set \$HOST_TRIPLET like so:"
echo " export HOST_TRIPLET=mipsel-linux-uclibc-"
EXITVAL=-1
fi
if [ -z $HOST ]
then
echo "You must specify a target processor with \$HOST; for example:"
echo " export HOST=mipsel-unknown-elf"
EXITVAL=-1
fi
if [ -z $BUILD ]
then
echo "You should specify the host machine's type with \$BUILD; for example:"
echo " export BUILD=i686-pc-linux-gnu"
echo "If you wish to let configure autodetect the host, set \$BUILD to 'auto':"
echo " export BUILD=auto"
EXITVAL=-1
fi
if [ ! -x $CROSSPATH/$HOST_TRIPLETgcc ]
then
echo "The specified toolchain does not contain an executable C compiler."
echo "Please double-check your settings and rerun cross.sh."
EXITVAL=-1
fi
if [ $EXITVAL -ne 0 ]
then
echo "Remember, you can hard-code these values in cross.sh if needed."
exit $EXITVAL
fi
if [ ! -z "$GEN_BUILD" -a ! -f configure ]
then
export NOCONF=yes
./autogen.sh
fi
# clean up any existing object files
if [ -f src/or/tor ]
then
make clean
fi
# Set up the build environment and try to run configure
export PATH=$PATH:$CROSSPATH
export RANLIB=${HOST_TRIPLET}ranlib
export CC=${HOST_TRIPLET}gcc
if [ $BUILD == "auto" ]
then
./configure \
--enable-debug \
--enable-eventdns \
--prefix=$PREFIX \
--host=$HOST
else
./configure \
--enable-debug \
--enable-eventdns \
--prefix=$PREFIX \
--host=$HOST \
--build=$BUILD
fi
# has a problem occurred?
if [ $? -ne 0 ]
then
echo ""
echo "A problem has been detected with configure."
echo "Please check the output above and rerun cross.sh"
echo ""
exit -1
fi
# Now we're cookin'
make
# has a problem occurred?
if [ $? -ne 0 ]
then
echo ""
echo "A problem has been detected with make."
echo "Please check the output above and rerun make."
echo ""
exit -1
fi
# if $STRIP has length (i.e. STRIP=yes), strip the binaries
if [ ! -z $STRIP ]
then
${HOST_TRIPLET}strip \
src/or/tor \
src/test/test \
src/tools/tor-resolve
fi
echo ""
echo "Tor should be compiled at this point. Now run 'make install' to"
echo "install to $PREFIX"
echo ""
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