2 # $Id: auto.obj.mk,v 1.12 2015/12/16 01:57:06 sjg Exp $
4 # @(#) Copyright (c) 2004, Simon J. Gerraty
6 # This file is provided in the hope that it will
7 # be of use. There is absolutely NO WARRANTY.
8 # Permission to copy, redistribute or otherwise
9 # use this file is hereby granted provided that
10 # the above copyright notice and this notice are
13 # Please send copies of changes and bug-fixes to:
20 # A race condition in some versions of mkdir, means that it can bail
21 # if another process made a dir that mkdir expected to.
22 # We repeat the mkdir -p a number of times to try and work around this.
23 # We stop looping as soon as the dir exists.
24 # If we get to the end of the loop, a plain mkdir will issue an error.
27 for i in 1 2 3 4 5 6; do \
29 test -d $$d && return 0; \
30 done > /dev/null 2>&1; \
31 mkdir $$d || exit $$?; \
35 # if MKOBJDIRS is set to auto (and NOOBJ isn't defined) do some magic...
36 # This will automatically create objdirs as needed.
37 # Skip it if we are just doing 'clean'.
38 .if ${MK_AUTO_OBJ:Uno} == "yes"
41 .if !defined(NOOBJ) && !defined(NO_OBJ) && ${MKOBJDIRS:Uno} == auto
42 # Use __objdir here so it is easier to tweak without impacting
44 .if !empty(MAKEOBJDIRPREFIX)
45 .if ${.CURDIR:M${MAKEOBJDIRPREFIX}/*} != ""
46 # we are already in obj tree!
49 __objdir?= ${MAKEOBJDIRPREFIX}${.CURDIR}
51 __objdir?= ${MAKEOBJDIR:Uobj}
52 __objdir:= ${__objdir}
53 .if ${.OBJDIR:tA} != ${__objdir:tA}
54 # We need to chdir, make the directory if needed
55 .if !exists(${__objdir}/) && \
56 (${.TARGETS} == "" || ${.TARGETS:Nclean*:N*clean:Ndestroy*} != "")
57 # This will actually make it...
58 __objdir_made != echo ${__objdir}/; umask ${OBJDIR_UMASK:U002}; \
59 ${ECHO_TRACE} "[Creating objdir ${__objdir}...]" >&2; \
60 ${Mkdirs}; Mkdirs ${__objdir}
62 # This causes make to use the specified directory as .OBJDIR
64 .if ${.OBJDIR:tA} != ${__objdir:tA}
65 # we did not get what we want - do we care?
66 .if ${__objdir_made:Uno:M${__objdir}/*} != ""
67 # watch out for __objdir being relative path
68 .if !(${__objdir:M/*} == "" && ${.OBJDIR:tA} == ${${.CURDIR}/${__objdir}:L:tA})
69 .error could not use ${__objdir}: .OBJDIR=${.OBJDIR}
72 # apparently we can live with it
73 # make sure we know what we have