1# $Id: auto.obj.mk,v 1.21 2025/08/09 22:42:24 sjg Exp $ 2# 3# @(#) Copyright (c) 2004-2025, Simon J. Gerraty 4# 5# SPDX-License-Identifier: BSD-2-Clause 6# 7# Please send copies of changes and bug-fixes to: 8# sjg@crufty.net 9# 10 11ECHO_TRACE ?= echo 12 13.ifndef Mkdirs 14# A race condition in some versions of mkdir, means that it can bail 15# if another process made a dir that mkdir expected to. 16# We repeat the mkdir -p a number of times to try and work around this. 17# We stop looping as soon as the dir exists. 18# If we get to the end of the loop, a plain mkdir will issue an error. 19Mkdirs= Mkdirs() { \ 20 for d in $$*; do \ 21 for i in 1 2 3 4 5 6; do \ 22 mkdir -p $$d; \ 23 test -d $$d && return 0; \ 24 done > /dev/null 2>&1; \ 25 mkdir $$d || exit $$?; \ 26 done; } 27.endif 28 29# if MKOBJDIRS is set to auto (and NOOBJ isn't defined) do some magic... 30# This will automatically create objdirs as needed. 31# Skip it if we are just doing 'clean'. 32.if ${MK_AUTO_OBJ:Uno} == "yes" 33MKOBJDIRS= auto 34.endif 35.if !defined(NOOBJ) && !defined(NO_OBJ) && ${MKOBJDIRS:Uno} == auto 36# Use __objdir here so it is easier to tweak without impacting 37# the logic. 38.if !empty(MAKEOBJDIRPREFIX) 39.if ${.CURDIR:M${MAKEOBJDIRPREFIX}/*} != "" 40# we are already in obj tree! 41__objdir?= ${.CURDIR} 42.endif 43__objdir?= ${MAKEOBJDIRPREFIX}${.CURDIR} 44.endif 45__objdir?= ${MAKEOBJDIR:Uobj} 46# relative dirs can cause trouble below 47# keep it simple and convert to absolute path now if needed 48.if ${__objdir:M/*} == "" 49# avoid ugly ${.CURDIR}/./obj etc. 50__objdir:= ${.CURDIR}/${__objdir:S,^./,,} 51.endif 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# we attempted to make ${__objdir} and failed 67.error could not use ${__objdir}: .OBJDIR=${.OBJDIR} 68.endif 69# apparently we can live with it 70# make sure we know what we have 71.OBJDIR: ${.CURDIR} 72.endif 73.endif 74.endif 75