# --- T2-COPYRIGHT-NOTE-BEGIN ---
# T2 SDE: package/*/ccache/parse-config
# Copyright (C) 2004 - 2024 The T2 SDE Project
# 
# This Copyright note is generated by scripts/Create-CopyPatch,
# more information can be found in the files COPYING and README.
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2.
# --- T2-COPYRIGHT-NOTE-END ---

if [ "$SDECFG_PKG_CCACHE_USEIT" = 1 -a "`type -p ccache`" ]; then
    if [ "$pkg" == gcc -a "$SDECFG_MULTILIB" = 1 ]; then
	: # in GCC multilib builds the ccache hash currently collides (or so)
    else
	unset ${!CCACHE_*}

	ccache_dir=ccache
	# wrap the sytem compiler
	atstage toolchain && var_append ccache_dir - ${arch_build%%-*}
	var_append ccache_dir - $arch

	# do not trash the cache with feature-less built packages
	[ $stagelevel -le 2 ] && var_append ccache_dir - $stagelevel

	export CCACHE_DIR="$base/build/$ccache_dir/$pkg"
	export CCACHE_DONT_STAT_COMPILER=1	# legacy T2, could be removed in the future
	export CCACHE_COMPILERCHECK="none"	# native since ccache-3.1.5
	export CCACHE_UNIFY=1 # needed to e.g. strip comments
	#export CCACHE_LOGFILE="$CCACHE_DIR.log"

	# In the chroot sandbox we need to wire the cccache-$arch out by using
	# the existing bind mount. We only do this, if we are not doing a
	# manual stage9 build ...
	if atstage native && [ "$ROCK_THIS_IS_CHROOT" ]; then
		mkdir -p $base/loop/build/$ccache_dir
		ln -snf ../loop/build/$ccache_dir $base/build/$ccache_dir
	fi

	# we instruct the flist wrapper to filter out ccache access, to
	# further reduce flist post processing time for big packages
	var_append FLWRAPPER_FILTERDIR ':' "$CCACHE_DIR"

	mkdir -p "$CCACHE_DIR"

	if [ "$SDECFG_PKG_CCACHE_CLEANUP" != 0 ]; then
		# we need to know if atime tests work or not
		echo > $CCACHE_DIR/.timestamp
		echo > $CCACHE_DIR/.timestamp-reference
	fi

	ccache -M $SDECFG_PKG_CCACHE_MAX > /dev/null

	# just using the CC_WRAPPER would not wrap KCC ... - thus we use GCC for C and C++
	# and KCC for the kernel builds ...
	if ! atstage toolchain; then
		var_insert KCC_WRAPPER_OTHERS ":" "ccache"
		var_insert GCC_WRAPPER_OTHERS ":" "ccache"
	else
		var_insert SYSCC_WRAPPER_OTHERS ":" "ccache"
	fi

	eval "$(ccache -s -v | gawk 'BEGIN {hit=0}
			/[Hh]it/ { hit+=$2; }
			/[Mm]iss/ { miss=$2; }
			END { if (hit+miss == 0) print "x=0.00";
			else printf "x=%.2f\n", hit*100 / (hit+miss);
			print "ccache_hit=" hit "; ccache_miss=" miss; }')"
	echo_status "Compiler Cache enabled: $x% cache hits so far"

	ccache_print_status_and_cleanup () {
		eval "$(ccache -s -v | gawk 'BEGIN {hit=0}
			/[Hh]it/ { hit+=$2; }
			/[Mm]iss/ { miss=$2; }
			END { hit-='$ccache_hit'; miss-='$ccache_miss';
			if (hit+miss == 0) print "x=0.00";
			else printf "x=%.2f\n", hit*100 / (hit+miss);
			print "ccache_hit=" hit "; ccache_miss=" miss; }')"
		echo_status "Compiler Cache Hits while pkg build: $x% (`
			`$ccache_hit hits, $ccache_miss misses)"

		if [ "$SDECFG_PKG_CCACHE_CLEANUP" != 0 ]; then
			# test if fs supports atime
			cat $CCACHE_DIR/.timestamp > /dev/null
			if [ "$(find $CCACHE_DIR/.timestamp -anewer $CCACHE_DIR/.timestamp-reference)" ]
			then
			  if [ -f $root/var/adm/logs/$stagelevel-$xpkg.log ]; then

				# remove non-hits from the ccache cache ...
				#
				echo_status "Cleaning up ccache"
				find $CCACHE_DIR -type f ! -anewer $CCACHE_DIR/.timestamp-reference -a ! -name '*.stderr' |
				while read fn ;do
					rm -f $fn{,.stderr} 2>/dev/null
				done
			  fi
			else
				echo_warning "No atime support available, ccache clean up not possible!"
			fi
		fi
	}

	hook_add finish 9 ccache_print_status_and_cleanup

	# last but not least make sure the package does not depend on ccache
	var_append flistrfilter "|" ".*bin/ccache"
    fi
fi