1 # $Id: sys.clean-env.mk,v 1.20 2012/11/12 06:56:04 sjg Exp $
3 # @(#) Copyright (c) 2009, Simon J. Gerraty
5 # This file is provided in the hope that it will
6 # be of use. There is absolutely NO WARRANTY.
7 # Permission to copy, redistribute or otherwise
8 # use this file is hereby granted provided that
9 # the above copyright notice and this notice are
12 # Please send copies of changes and bug-fixes to:
16 # This makefile would normally be included by sys.env.mk
18 # The variables used by this makefile include:
20 # MAKE_ENV_SAVE_VAR_LIST
21 # The actuall list of variables from the environment that will be
23 # MAKE_ENV_SAVE_PREFIX_LIST
24 # A list of prefixes to match against the environment - the results
25 # are added to MAKE_ENV_SAVE_VAR_LIST after being filtered by...
26 # MAKE_ENV_SAVE_EXCLUDE_LIST
27 # A list of words or patterns which is turned into a list of :N
30 .if ${.MAKE.LEVEL} == 0 && ${MAKE_VERSION} >= 20100606
31 # We save any env var that starts with the words in MAKE_ENV_SAVE_PREFIX_LIST.
32 # This gets expanded to an egrep expression like '^(A|B|C...)'
33 # and added to MAKE_ENV_SAVE_VAR_LIST below.
34 # If any of these end up being too greedy, MAKE_ENV_SAVE_EXCLUDE_LIST
35 # can be used to filter.
36 MAKE_ENV_SAVE_PREFIX_LIST += \
54 # This could be a list of vars or patterns to explicitly exclude.
55 MAKE_ENV_SAVE_EXCLUDE_LIST ?= _
57 # This is the actual list that we will save
58 # HOME is probably something worth clobbering eg.
60 MAKE_ENV_SAVE_VAR_LIST += \
69 ${_env_vars:${MAKE_ENV_SAVE_EXCLUDE_LIST:${M_ListToSkip}}}
71 _env_vars != env | egrep '^(${MAKE_ENV_SAVE_PREFIX_LIST:ts|})' | sed 's,=.*,,'; echo
74 .for v in ${MAKE_ENV_SAVE_VAR_LIST:O:u}
82 # Now, clobber the environment
85 # This is a list of vars that we handle specially below
86 _tricky_env_vars = MAKEOBJDIR OBJTOP
87 # Export our selection - sans tricky ones
88 .export ${_export_list:${_tricky_env_vars:${M_ListToSkip}}}
90 # This next bit may need tweaking
91 # if you don't happen to like the way I set it.
92 .if defined(MAKEOBJDIR)
93 # We are going to set this to the equivalent of the shell's
94 # MAKEOBJDIR='${.CURDIR:S,${SRCTOP},${OBJTOP},}'
95 _srctop := ${SRCTOP:U${SB_SRC:U${SB}/src}}
96 _objroot := ${OBJROOT:U${SB_OBJROOT:U${SB}/${SB_OBJPREFIX}}}
97 _objtop := ${OBJTOP:U${_objroot}${MACHINE}}
98 # Take care of ${MACHINE}
99 .if ${MACHINE} == "host" || ${OBJTOP} == ${HOST_OBJTOP:Uno}
100 OBJTOP = ${_objtop:S,${HOST_TARGET}$,\${MACHINE},}
102 OBJTOP = ${_objtop:S,${MACHINE}$,\${MACHINE},}
105 MAKEOBJDIR = $${.CURDIR:S,${_srctop},$${OBJTOP},}
106 #.info ${MAKE_SAVE_ENV_VARS _srctop _objroot _objtop OBJTOP MAKEOBJDIR:L:@v@${.newline}$v=${$v}@}
108 # Export these as-is, and do not track...
109 # otherwise the environment will be ruined when we evaluate them below.
110 .export-env ${_tricky_env_vars}
112 # Now evaluate for ourselves
113 .for v in ${_tricky_env_vars}
116 #.info ${_tricky_env_vars:@v@${.newline}$v=${$v}@}