build

#!/bin/sh
set -e -u

buildProductsDir=$( pwd )
projectDir=$( dirname "$0" )

# Make projectDir absolute
case $projectDir in
	/*) ;;
	*) projectDir="$buildDir/$projectDir"
esac

. "$projectDir/shared.inc"


printHelp()
{
	help='
SYNTAX
------

    ./build <build_style> [options] ...

OPTIONS
-------

    -help          Show this help screen.
    -clean         Make a clean build.
    -listSytles    List available build styples.
'
	printf '%s\n' "$help"
	exit "$1"
}


clean=
buildStyle=

while [ $# -gt 0 ]
do
	case $1 in
		-listStyles)
			echo
			echo "Available Build Styles:"
			echo
			for style in "$projectDir/cfg"/*.cfg
			do
				if [ -f "$style" ]
				then
					stylename=$( basename "$style" )
					stylename=${stylename%.cfg}
					printf '%s\n' "$stylename"
				fi
			done
			exit 0
		 ;;


		-help) printHelp 0 ;;
		-clean) clean=true ;;
		-*) syntaxError "Unkown option \"$1\"" ;;

		*)
			if [ -f "$projectDir/cfg/$1.cfg" ]
			then
				[ -z "$buildStyle" ] \
					||  syntaxError "Multiple build styles are not allowed"
				buildStyle=$1
			else
				syntaxError "Unkonwn build style \"$1\""
			fi
		;;
	esac
	shift
done


buildStyle=${buildStyle:-"release"}
cfgFile="$projectDir/cfg/$buildStyle.cfg"

srcDir="$projectDir/src/code"
buildDir="$buildProductsDir/build"

objDir="$buildDir/objects"
lastBuildCfg="$buildDir/last.cfg"


if [ -n "$clean" ] \
	|| ( [ -f "$lastBuildCfg" ] && ! cmp -s "$lastBuildCfg" "$cfgFile" )
then
	rm -r "$buildDir"
fi

[ -d "$buildDir" ] || mkdir -p "$buildDir"
[ -f "$lastBuildCfg" ] || cp "$cfgFile" "$lastBuildCfg"


buildArgs=
parseCfgFile buildArgs "$cfgFile"
srcFileList="$buildDir/sources.txt"
find "$srcDir" -name "*.c" >"$srcFileList"


echo
echo '=== Building ==='
[ -z "$clean" ] || echo "(clean build)"
echo

while IFS='' read -r srcFile
do
	echo "Next: ${srcFile#"$projectDir/"}"
	objFile="$objDir/${srcFile#"$srcDir/"}.o"
	flagsFile=$( findCompileFlags "$srcFile" "$projectDir" )

	flagsFileDir=
	flagsFileContent=
	if [ -n "$flagsFile" ]
	then
		parseCfgFile flagsFileContent "$flagsFile"
		flagsFileDir=$( dirname "$flagsFile" )
	fi

	if ! objectFileIsOutdated \
		"$objFile" "$srcFile" \
		"$flagsFileContent" "$flagsFileDir"
	then
		echo 'Nothing to do.'
		echo
		continue
	fi

	objFileDir=$( dirname "$objFile" )
	[ -d "$objFileDir" ] || mkdir -p "$objFileDir"

	buildCmd="clang -c -o $( quote "$objFile" )"
	buildCmd="$buildCmd $flagsFileContent $buildArgs"
	buildCmd="$buildCmd $(quote "$srcFile" )"

	if [ -n "$flagsFileDir" ]
	then
		buildCmd="( cd $( quote "$flagsFileDir" ) && $buildCmd )"
	fi

	if ! eval "$buildCmd"
	then
		echo "Error: Building failed!" >&2
		echo "Build command was: $buildCmd" >&2
		exit 1
	fi

	echo "Created ${objFile#"$buildProductsDir/"}"
	echo

done <"$srcFileList"


echo
echo '=== Linking ==='
echo

libFile="$buildProductsDir/$LIBNAME"

if [ ! -f "$libFile" ] \
	|| anyFileIsNewerThan "$libFile" "$objDir"
then
	objFileList="$buildDir/objects.txt"
	find "$objDir" -name "*.o" >"$objFileList"

	arCmd="ar -q -s -c $( quote "$libFile" )"

	while IFS='' read -r objFile
	do
		arCmd="$arCmd $( quote "$objFile" )"
	done <"$objFileList"

	[ -f "$libFile" ] && rm "$libFile"
	eval "$arCmd"
	echo "Created $LIBNAME"
else
	echo "Nothing to do."
fi
echo