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# $Id: sys.clean-env.mk,v 1.20 2012/11/12 06:56:04 sjg Exp $
#
# @(#) Copyright (c) 2009, 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
#
# This makefile would normally be included by sys.env.mk
# The variables used by this makefile include:
#
# MAKE_ENV_SAVE_VAR_LIST
# The actuall list of variables from the environment that will be
# preserved.
# MAKE_ENV_SAVE_PREFIX_LIST
# A list of prefixes to match against the environment - the results
# are added to MAKE_ENV_SAVE_VAR_LIST after being filtered by...
# MAKE_ENV_SAVE_EXCLUDE_LIST
# A list of words or patterns which is turned into a list of :N
# modifiers.
.if ${.MAKE.LEVEL} == 0 && ${MAKE_VERSION} >= 20100606
# We save any env var that starts with the words in MAKE_ENV_SAVE_PREFIX_LIST.
# This gets expanded to an egrep expression like '^(A|B|C...)'
# and added to MAKE_ENV_SAVE_VAR_LIST below.
# If any of these end up being too greedy, MAKE_ENV_SAVE_EXCLUDE_LIST
# can be used to filter.
MAKE_ENV_SAVE_PREFIX_LIST += \
CCACHE \
CVS \
DEBUG \
DISTCC \
HOST \
MACHINE \
MAKE \
MK \
NEED_ \
SB_ \
SSH \
SVN \
USE_ \
WITH_ \
WITHOUT_ \
# This could be a list of vars or patterns to explicitly exclude.
MAKE_ENV_SAVE_EXCLUDE_LIST ?= _
# This is the actual list that we will save
# HOME is probably something worth clobbering eg.
# HOME=/var/empty
MAKE_ENV_SAVE_VAR_LIST += \
HOME \
LOGNAME \
OBJROOT \
OBJTOP \
PATH \
SB \
SRCTOP \
USER \
${_env_vars:${MAKE_ENV_SAVE_EXCLUDE_LIST:${M_ListToSkip}}}
_env_vars != env | egrep '^(${MAKE_ENV_SAVE_PREFIX_LIST:ts|})' | sed 's,=.*,,'; echo
_export_list =
.for v in ${MAKE_ENV_SAVE_VAR_LIST:O:u}
.if defined($v)
_export_list += $v
# Save current value
$v := ${$v}
.endif
.endfor
# Now, clobber the environment
.unexport-env
# This is a list of vars that we handle specially below
_tricky_env_vars = MAKEOBJDIR OBJTOP
# Export our selection - sans tricky ones
.export ${_export_list:${_tricky_env_vars:${M_ListToSkip}}}
# This next bit may need tweaking
# if you don't happen to like the way I set it.
.if defined(MAKEOBJDIR)
# We are going to set this to the equivalent of the shell's
# MAKEOBJDIR='${.CURDIR:S,${SRCTOP},${OBJTOP},}'
_srctop := ${SRCTOP:U${SB_SRC:U${SB}/src}}
_objroot := ${OBJROOT:U${SB_OBJROOT:U${SB}/${SB_OBJPREFIX}}}
_objtop := ${OBJTOP:U${_objroot}${MACHINE}}
# Take care of ${MACHINE}
.if ${MACHINE} == "host" || ${OBJTOP} == ${HOST_OBJTOP:Uno}
OBJTOP = ${_objtop:S,${HOST_TARGET}$,\${MACHINE},}
.else
OBJTOP = ${_objtop:S,${MACHINE}$,\${MACHINE},}
.endif
# Export like this
MAKEOBJDIR = $${.CURDIR:S,${_srctop},$${OBJTOP},}
#.info ${MAKE_SAVE_ENV_VARS _srctop _objroot _objtop OBJTOP MAKEOBJDIR:L:@v@${.newline}$v=${$v}@}
# Export these as-is, and do not track...
# otherwise the environment will be ruined when we evaluate them below.
.export-env ${_tricky_env_vars}
# Now evaluate for ourselves
.for v in ${_tricky_env_vars}
$v := ${$v}
.endfor
#.info ${_tricky_env_vars:@v@${.newline}$v=${$v}@}
.endif # MAKEOBJDIR
.endif # level 0
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