1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
# $Id: sys.clean-env.mk,v 1.22 2017/10/25 23:44:20 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}}}
.if ${MAKE_VERSION} < 20160218
_objtop := ${OBJTOP:U${_objroot}${MACHINE}}
# Take care of ${MACHINE}
.if ${MACHINE:Nhost*} == "" || ${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
.else
# we cannot use the '$$' trick, anymore
# but we can export a literal (unexpanded) value
SRCTOP := ${_srctop}
OBJROOT := ${_objroot}
OBJTOP = ${OBJROOT}${MACHINE}
MAKEOBJDIR = ${.CURDIR:S,${SRCTOP},${OBJTOP},}
.export-literal SRCTOP OBJROOT ${_tricky_env_vars}
.endif
#.info ${_tricky_env_vars:@v@${.newline}$v=${$v}@}
#showenv:
# @env | egrep 'OBJ|SRC'
.endif # MAKEOBJDIR
.endif # level 0
|
