contrib/bmake/mk/auto.obj.mk

   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
  16 ECHO_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.
  24 Mkdirs= 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