57 lines
1.9 KiB
Makefile
57 lines
1.9 KiB
Makefile
# $Id: auto.obj.mk,v 1.8 2011/08/08 17:35:20 sjg Exp $
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#
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# @(#) Copyright (c) 2004, Simon J. Gerraty
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#
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# This file is provided in the hope that it will
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# be of use. There is absolutely NO WARRANTY.
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# Permission to copy, redistribute or otherwise
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# use this file is hereby granted provided that
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# the above copyright notice and this notice are
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# left intact.
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#
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# Please send copies of changes and bug-fixes to:
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# sjg@crufty.net
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#
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ECHO_TRACE ?= echo
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.ifndef Mkdirs
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# A race condition in some versions of mkdir, means that it can bail
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# if another process made a dir that mkdir expected to.
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# We repeat the mkdir -p a number of times to try and work around this.
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# We stop looping as soon as the dir exists.
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# If we get to the end of the loop, a plain mkdir will issue an error.
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Mkdirs= Mkdirs() { \
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for d in $$*; do \
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for i in 1 2 3 4 5 6; do \
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mkdir -p $$d; \
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test -d $$d && return 0; \
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done > /dev/null 2>&1; \
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mkdir $$d || exit $$?; \
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done; }
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.endif
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# if MKOBJDIRS is set to auto (and NOOBJ isn't defined) do some magic...
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# This will automatically create objdirs as needed.
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# Skip it if we are just doing 'clean'.
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.if !defined(NOOBJ) && !defined(NO_OBJ) && ${MKOBJDIRS:Uno} == auto
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# Use __objdir here so it is easier to tweak without impacting
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# the logic.
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__objdir?= ${MAKEOBJDIR}
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.if ${.OBJDIR} != ${__objdir}
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# We need to chdir, make the directory if needed
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.if !exists(${__objdir}/) && \
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(${.TARGETS} == "" || ${.TARGETS:Nclean*:N*clean:Ndestroy*} != "")
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# This will actually make it...
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__objdir_made != echo ${__objdir}/; umask ${OBJDIR_UMASK:U002}; \
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${ECHO_TRACE} "[Creating objdir ${__objdir}...]" >&2; \
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${Mkdirs}; Mkdirs ${__objdir}
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.endif
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# This causes make to use the specified directory as .OBJDIR
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.OBJDIR: ${__objdir}
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.if ${.OBJDIR} != ${__objdir} && ${__objdir_made:Uno:M${__objdir}/*} != ""
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.error could not use ${__objdir}
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.endif
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.endif
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.endif
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