1# $Id: auto.obj.mk,v 1.16 2020/08/19 17:51:53 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) 44.if ${.CURDIR:M${MAKEOBJDIRPREFIX}/*} != "" 45# we are already in obj tree! 46__objdir?= ${.CURDIR} 47.endif 48__objdir?= ${MAKEOBJDIRPREFIX}${.CURDIR} 49.endif 50__objdir?= ${MAKEOBJDIR:Uobj} 51__objdir:= ${__objdir} 52.if ${.OBJDIR:tA} != ${__objdir:tA} 53# We need to chdir, make the directory if needed 54.if !exists(${__objdir}/) && \ 55 (${.TARGETS} == "" || ${.TARGETS:Nclean*:N*clean:Ndestroy*} != "") 56# This will actually make it... 57__objdir_made != echo ${__objdir}/; umask ${OBJDIR_UMASK:U002}; \ 58 ${ECHO_TRACE} "[Creating objdir ${__objdir}...]" >&2; \ 59 ${Mkdirs}; Mkdirs ${__objdir} 60.endif 61# This causes make to use the specified directory as .OBJDIR 62.OBJDIR: ${__objdir} 63.if ${.OBJDIR:tA} != ${__objdir:tA} 64# we did not get what we want - do we care? 65.if ${__objdir_made:Uno:M${__objdir}/*} != "" 66# watch out for __objdir being relative path 67.if !(${__objdir:M/*} == "" && ${.OBJDIR:tA} == ${${.CURDIR}/${__objdir}:L:tA}) 68.error could not use ${__objdir}: .OBJDIR=${.OBJDIR} 69.endif 70.endif 71# apparently we can live with it 72# make sure we know what we have 73.OBJDIR: ${.CURDIR} 74.endif 75.endif 76.endif 77