1# $Id: auto.obj.mk,v 1.11 2015/06/16 06:28:21 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 ${MK_AUTO_OBJ:Uno} == "yes" 38MKOBJDIRS= auto 39.endif 40.if !defined(NOOBJ) && !defined(NO_OBJ) && ${MKOBJDIRS:Uno} == auto 41# Use __objdir here so it is easier to tweak without impacting 42# the logic. 43.if !empty(MAKEOBJDIRPREFIX) && exists(${MAKEOBJDIRPREFIX}) 44__objdir?= ${MAKEOBJDIRPREFIX}${.CURDIR} 45.endif 46__objdir?= ${MAKEOBJDIR:Uobj} 47__objdir:= ${__objdir:tA} 48.if ${.OBJDIR} != ${__objdir} 49# We need to chdir, make the directory if needed 50.if !exists(${__objdir}/) && \ 51 (${.TARGETS} == "" || ${.TARGETS:Nclean*:N*clean:Ndestroy*} != "") 52# This will actually make it... 53__objdir_made != echo ${__objdir}/; umask ${OBJDIR_UMASK:U002}; \ 54 ${ECHO_TRACE} "[Creating objdir ${__objdir}...]" >&2; \ 55 ${Mkdirs}; Mkdirs ${__objdir} 56__objdir:= ${__objdir:tA} 57.endif 58# This causes make to use the specified directory as .OBJDIR 59.OBJDIR: ${__objdir} 60.if ${.OBJDIR} != ${__objdir} && ${__objdir_made:Uno:M${__objdir}/*} != "" 61.error could not use ${__objdir}: .OBJDIR=${.OBJDIR} 62.endif 63.endif 64.endif 65