configure

#!/bin/bash
#
# A configure stub for people used to that syntax
# Do ./configure --help for usage instructions
#

usage()
{
tee -a $CONFIGLOG <<-EOF
	Configure and prepare the source code for building.

	Usage:
	   $0 [flags] [CMAKE_VAR1=VALUE [CMAKE_VAR2=VALUE2 [...]]]

	Available flags:
	   --prefix=<prefix>		# will install the code into <prefix>
	   --optimized			# configure the 'Release' build
	   --debug			# configure the 'Debug' build
	   --env=<VAR=VALUE>		# set VAR=VALUE environment variable
	                                # before running CMAKE
	   --with-gcc=<gcc_root>        # use gcc from <gcc_root> directory
	   --with-cuda=<cuda_root>      # use CUDA toolkit from <cuda_root>
	   --with-boost=<boost_root>	# use boost from <boost_root> directory
	   --with-libpeyton=<lp_root>   # use libpeyton from <lp_root> directory
	   --devemu			# target CUDA code for device emulation

	If ran from the top level source directory, it will configure the build
	directory in build/optimized/debug (depending on whether --optimized or
	--debug flags were present), as well as generate a simple Makefile to
	allowing the user to build the code directly from the top-level directory.

	Otherwise, it will configure the source in the current directory (assuming
	it's meant to be the build directory).

	This build system uses CMake. If your CMake executable is in
	nonstandard location, you may specify it via the CMAKE environment
	variable.
	
	                                   Written by Mario Juric <mjuric@ias.edu>

EOF
}

xecho()
{
	echo "== $@" | tee -a $CONFIGLOG
}

oecho()
{
	echo "** $@" >> $CONFIGLOG
}

configlog()
{
	CONFIGLOG_FINAL="$CONFIGLOG"
	CONFIGLOG="$CONFIGLOG.tmp"
	cat > $CONFIGLOG <<-EOF
		This file contains any messages produced by CMake while
		running configure, to aid debugging if configure makes a mistake.

		It was created by configure, an Autoconf-like script for CMake
		written by Mario Juric <mjuric@ias.edu>. Invocation command line
		was:

		\$ $0 $@

		## --------- ##
		## Platform. ##
		## --------- ##

		hostname = `(hostname || uname -n) 2>/dev/null | sed 1q`
		uname -m = `(uname -m) 2>/dev/null || echo unknown`
		uname -r = `(uname -r) 2>/dev/null || echo unknown`
		uname -s = `(uname -s) 2>/dev/null || echo unknown`
		uname -v = `(uname -v) 2>/dev/null || echo unknown`

		CMAKE             = $CMAKE
		which \$CMAKE      = `(which "$CMAKE") 2>/dev/null       || echo not found`
		\$CMAKE --version  = `("$CMAKE" --version) 2>/dev/null       || echo not found`
		
		## ------------------ ##
		## Configuration log. ##
		## ------------------ ##

	EOF
	# If CONFIGLOG_FINAL is defined, move $CONFIGLOG to $CONFIGLOG_FINAL (and delete $CONFIGLOG)
	# In case you're wondering, CONFIGLOG_FINAL becomes undefined if --help was given on the command line
	trap "{ test \"x\$CONFIGLOG_FINAL\" != x && mv '$CONFIGLOG' '$CONFIGLOG_FINAL'; rm -f '$CONFIGLOG'; }" EXIT
}

# Defaults
CMAKE=${CMAKE:-cmake}
ENV=${env}

# Store invocation information
CONFIGLOG="`pwd`/config.log"
configlog "$@"

# Quick check for CMake
which $CMAKE 2>&1 > /dev/null || {
	CML=`dirname $0`"/CMakeLists.txt"
	xecho "No usable CMake found (tried looking for executable \`$CMAKE')"
	test -f "$CML" && {
		CMV=`grep -i cmake_minimum_required "$CML" | perl -e '$_=<>; ($v) = /^cmake_minimum_required\s*\(\s*version\s+([0-9.]+)\s*\)/i; print $v'`;
		test "x$CMV" != "x" && xecho "CMake $CMV or greater is needed to build this code.";
	} || {
		xecho "CMake is needed to build this code.";
	}
	xecho "If your CMake executable is in nonstandard location, you may specify"
	xecho "it via the CMAKE environment variable." 
	exit -1;
}

BUILDDIR='build'

#
# Project-specific command-line argument parsing
#
TEMP=`getopt -o hp: -l help,prefix:,debug,optimized,devemu,env:,with-gcc:,with-cuda:,with-boost:,with-libpeyton: -- "$@"` || { xecho "Try $0 --help"; exit $?; }
eval set -- "$TEMP"
while true ; do
	case "$1" in
		-p|--prefix)
			xecho "Setting install path to '$2'"
			CMAKE="$CMAKE -DCMAKE_INSTALL_PREFIX='$2'"
			shift 2 ;;
		--env)
			xecho "Setting environment variable '$2'"
			ENV="$ENV '$2'"
			shift 2 ;;
		--devemu)
			xecho "Targeting CUDA code for device emulation"
			CMAKE="$CMAKE -DCUDA_BUILD_EMULATION=ON"
			shift 1 ;;
		--debug)
			xecho "Setting build type to 'Debug'"
			BUILDDIR='debug'
			CMAKE="$CMAKE -DCMAKE_BUILD_TYPE='Debug'"
			shift 1 ;;
		--optimized)
			xecho "Setting build type to 'Release'"
			BUILDDIR='optimized'
			CMAKE="$CMAKE -DCMAKE_BUILD_TYPE='Release'"
			shift 1 ;;
		--with-boost)
			xecho "Using Boost from '$2'"
			CMAKE="$CMAKE -DBOOST_ROOT='$2'"
			shift 2 ;;
		--with-cuda)
			xecho "Using CUDA Toolkit from '$2'"
			CMAKE="$CMAKE -DCUDA_TOOLKIT_ROOT_DIR='$2'"
			shift 2 ;;
		--with-gcc)
			xecho "Using gcc suite from '$2'"
			CMAKE="$CMAKE -DCMAKE_CXX_COMPILER='$2/bin/g++'"
			CMAKE="$CMAKE -DCMAKE_C_COMPILER='$2/bin/gcc'"
			CMAKE="$CMAKE -DGCC_ROOT='$2'"
			ENV="$ENV LDFLAGS='-L$2/lib -L$2/lib64'"
			shift 2 ;;
		--with-libpeyton)
			xecho "Using libpeyton from '$2'"
			CMAKE="$CMAKE -Dlibpeyton_ROOT='$2'"
			shift 2 ;;
		-h|--help)
			usage;
			CONFIGLOG_FINAL=
			exit 0 ;;
		--) shift ; break ;;
		*) xecho "Internal error!" ; exit 1 ;;
	esac
done

# Figure out the build dir -- if we're in the same directory as the
# configure script, make a subdirectory based on the choice of BUILD_TYPE
test -x ./configure && {
	mkdir -p "$BUILDDIR" && cd "$BUILDDIR" && SOURCEDIR=".." || {
		xecho "Error creating build directory."; exit -1;
	}

	# A flag meaning we're configuring from in-source
	BDSET=1

	xecho "Build directory is '$BUILDDIR'"
} || {
	BUILDDIR="."
	SOURCEDIR=`dirname $0`
}

# Assume all extra arguments are CMAKE variable definitions
for arg do
	CMAKE="$CMAKE '-D$arg'"
done
CMAKE="$CMAKE $SOURCEDIR"

# Delete old CMakeCache.txt if it exists
test -f CMakeCache.txt && rm -f CMakeCache.txt

# Run cmake
xecho "Invoking CMake to configure the source"
oecho "$ENV $CMAKE"
eval $ENV $CMAKE | tee -a $CONFIGLOG;
test "x${PIPESTATUS[0]}" == "x0" && {
	if [ "$BDSET" == "1" ]; then
		# Generate a stub makefile that will hand-off compilation to the real makefile
		# This happens only when configure is run in-source
		cat > ../Makefile <<EOT
all:

tidy:
	@ rm -rf $BUILDDIR

%:
	@ test -f $BUILDDIR/Makefile || { echo "$BUILDDIR directory not configured. Run configure first." && false; }
	@ cd $BUILDDIR && \$(MAKE) \$@
EOT
	fi;
	xecho "Source configured in directory '$BUILDDIR'. Run \`make' to compile."
} || {
	xecho "Error configuring source."
}