1# $Id: auto.obj.mk,v 1.8 2011/08/08 17:35:20 sjg Exp $ 2# 3# @(#) Copyright (c) 2004, Simon J. Gerraty 4# 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 10# left intact. 11# 12# Please send copies of changes and bug-fixes to: 13# sjg@crufty.net 14# 15 16ECHO_TRACE ?= echo 17 18.ifndef Mkdirs 19# A race condition in some versions of mkdir, means that it can bail 20# if another process made a dir that mkdir expected to. 21# We repeat the mkdir -p a number of times to try and work around this. 22# We stop looping as soon as the dir exists. 23# If we get to the end of the loop, a plain mkdir will issue an error. 24Mkdirs= Mkdirs() { \ 25 for d in $$*; do \ 26 for i in 1 2 3 4 5 6; do \ 27 mkdir -p $$d; \ 28 test -d $$d && return 0; \ 29 done > /dev/null 2>&1; \ 30 mkdir $$d || exit $$?; \ 31 done; } 32.endif 33 34# if MKOBJDIRS is set to auto (and NOOBJ isn't defined) do some magic... 35# This will automatically create objdirs as needed. 36# Skip it if we are just doing 'clean'. 37.if !defined(NOOBJ) && !defined(NO_OBJ) && ${MKOBJDIRS:Uno} == auto 38# Use __objdir here so it is easier to tweak without impacting 39# the logic. 40__objdir?= ${MAKEOBJDIR} 41.if ${.OBJDIR} != ${__objdir} 42# We need to chdir, make the directory if needed 43.if !exists(${__objdir}/) && \ 44 (${.TARGETS} == "" || ${.TARGETS:Nclean*:N*clean:Ndestroy*} != "") 45# This will actually make it... 46__objdir_made != echo ${__objdir}/; umask ${OBJDIR_UMASK:U002}; \ 47 ${ECHO_TRACE} "[Creating objdir ${__objdir}...]" >&2; \ 48 ${Mkdirs}; Mkdirs ${__objdir} 49.endif 50# This causes make to use the specified directory as .OBJDIR 51.OBJDIR: ${__objdir} 52.if ${.OBJDIR} != ${__objdir} && ${__objdir_made:Uno:M${__objdir}/*} != "" 53.error could not use ${__objdir} 54.endif 55.endif 56.endif 57