configure

#!/bin/sh
#
# Search for GCC or XL C/C++, former if both exist
#
# To add another compiler, just create Makefile.XXX and add XXX to $CCS
#
# To prevent ugly Makefile extensions, underscore and chars following it
# in the name XXX are automatically removed before locating relevant
# Makefile. This is why compiler "xlc_r" has Makefile extension "xlc".
# This can be disabled if necessary.
#
#set -x

if [ -n "$CC" ]; then
	# If compiler is specified look for the path
	CCPATH=$(which $CC 2>&1)
	if [ -n "${CCPATH%%/*}" ]; then
		echo "Unable to find $CC, will search for a compatible compiler ..."
		CC=
	fi
fi

if [ -z "$CC" ]; then
	CCS="aarch64-linux-gnu-gcc xlc_r clang gcc"

	#
	# Look for supported compilers
	#
	for c in $CCS; do
		if CCPATH=$(which $c 2>&1) && [ -z "${CCPATH%%/*}" ] && $(echo "#include <sys/socket.h>" | $c -fsyntax-only -x c -); then
			CC="$c"
			break
		fi
	done
fi

#
# Make a link to a proper Makefile.*
#
if [ -z "$CC" ]; then
	echo "Unable to find GNU GCC, IBM XL C/C++ or clang. Fix your PATH!"
	exit 1
else
	echo "Using $CCPATH to compile Cntlm"
	[ -h Makefile ] && rm -f Makefile 2>/dev/null
	case "$CC" in
		gcc)
			# default Makefile is for GCC; just revert back to
			# GCC if Makefile is linked to other compiler version
			if [ ! -f Makefile ]; then
				mv Makefile.gcc Makefile
			fi
			;;
		*)
			EXT=$(echo "$CC" | sed 's/_.*//')
			if [ ! -f "Makefile.$EXT" ]; then
				echo "There must be a file 'Makefile.$EXT' to compile it with $CC"
				exit 1
			else
				# backup default GCC Makefile and create a link to other
				if [ -f Makefile ]; then
					mv Makefile Makefile.gcc
				fi

				ln -s Makefile.$EXT Makefile
			fi
			;;
	esac
fi

STAMP=configure-stamp
CONFIG=config/config.h
TESTS="endian strdup socklen_t gethostname arc4random_buf strlcat strlcpy"

#[ -f $STAMP ] && exit 0
touch $STAMP

rm -f $CONFIG
echo "#ifndef CONFIGURE_CONFIG_H" > $CONFIG
echo "#define CONFIGURE_CONFIG_H" >> $CONFIG
echo "" >> $CONFIG
for i in $TESTS; do
	printf "Checking $i... "
	printf "#define config_$i " >> $CONFIG
	$CC -std=c99 -D__BSD_VISIBLE -D_ALL_SOURCE -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200112 -D_ISOC99_SOURCE -D_REENTRANT -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_DARWIN_C_SOURCE -o config/$i config/$i.c 2> /dev/null
	rc=$?

	if [ $rc -ne 0 ]; then # -o -n "$OUT" ]; then
		rc=0
		RET=no
	else
		RET=$(./config/$i)
		rc=$?
		[ -z "$RET" ] && if [ $rc -eq 0 ]; then RET="no"; else RET=yes; fi
	fi

	echo $rc >> $CONFIG
	echo $RET
done

while [ $1 ]
do
	case $1 in
		--enable-kerberos)
			printf "#define ENABLE_KERBEROS" >> $CONFIG
			echo "" >> $CONFIG
			;;
		--enable-static)
			printf "#define ENABLE_STATIC" >> $CONFIG
			echo "" >> $CONFIG
			;;
		*)
			echo "Unknown flag $1"
			rm -f $CONFIG
			;;
	esac
	shift
done
if [ -f $CONFIG ]; then
	echo "" >> $CONFIG
	echo "#endif // CONFIGURE_CONFIG_H" >> $CONFIG
fi