share/mk/auto.obj.mk

   1 # $Id: auto.obj.mk,v 1.14 2017/04/18 23:53:18 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 ${MK_AUTO_OBJ:Uno} == "yes"
  38 MKOBJDIRS= 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} && ${__objdir_made:Uno:M${__objdir}/*} != ""
  64 # watch out for __objdir being relative path
  65 .if !(${__objdir:M/*} == "" && ${.OBJDIR:tA} == ${${.CURDIR}/${__objdir}:L:tA})
  66 .error could not use ${__objdir}: .OBJDIR=${.OBJDIR}
  67 .endif
  68 .endif
  69 .endif
  70 .endif