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# $Id: srctop.mk,v 1.1.1.1 2020/05/24 05:35:53 nia Exp $
#
# @(#) Copyright (c) 2012, Simon J. Gerraty
#
# This file is provided in the hope that it will
# be of use. There is absolutely NO WARRANTY.
# Permission to copy, redistribute or otherwise
# use this file is hereby granted provided that
# the above copyright notice and this notice are
# left intact.
#
# Please send copies of changes and bug-fixes to:
# sjg@crufty.net
#
.if !defined(SRCTOP)
# if using mk(1) SB will be set.
.ifdef SB
.if ${.CURDIR:S,${SB},,} != ${.CURDIR}
# we are actually within SB
.ifdef SB_SRC
SRCTOP:= ${SB_SRC}
.elif exists(${SB}/src)
SRCTOP:= ${SB}/src
.else
SRCTOP:= ${SB}
.endif
.endif
.endif
.if !defined(SRCTOP)
.for rd in share/mk build/mk mk
.if ${_this_mk_dir:M*${rd}} != ""
.if ${.CURDIR:S,${_this_mk_dir:${rd:C,[^/]+,H,g:S,/, ,g:ts:}},,} != ${.CURDIR}
SRCTOP:= ${_this_mk_dir:${rd:C,[^/]+,H,g:S,/, ,g:ts:}}
.endif
.endif
.endfor
.endif
.if !defined(SRCTOP)
_SRCTOP_TEST_?= [ -f ../.sandbox-env -o -d share/mk ]
# Linux at least has a bug where attempting to check an automounter
# directory will hang. So avoid looking above /a/b
SRCTOP!= cd ${.CURDIR}; while :; do \
here=`pwd`; \
${_SRCTOP_TEST_} && { echo $$here; break; }; \
case $$here in /*/*/*) cd ..;; *) echo ""; break;; esac; \
done
.endif
.if defined(SRCTOP) && exists(${SRCTOP}/.)
.export SRCTOP
.endif
.endif
.if !defined(OBJTOP) && !empty(SRCTOP)
.if defined(MAKEOBJDIRPREFIX) && exists(${MAKEOBJDIRPREFIX}${SRCTOP})
OBJTOP= ${MAKEOBJDIRPREFIX}${SRCTOP}
.elif (exists(${SRCTOP}/Makefile) || exists(${SRCTOP}/makefile))
OBJTOP!= cd ${SRCTOP} && ${PRINTOBJDIR}
.endif
.if empty(OBJTOP)
OBJTOP= ${SRCTOP}
.endif
.export OBJTOP
.endif
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