share/mk/whats.mk

   1 # $Id: whats.mk,v 1.1 2014/08/30 22:40:47 sjg Exp $
   2 #
   3 #       @(#) Copyright (c) 2014, 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 .if ${MK_WHATSTRING:Uno} != "no"
  17 what_build_exts?= o
  18 # it can be useful to embed a what(1) string in binaries
  19 # so that the build location can be seen from a core file.
  20 .if defined(PROG) && ${.MAKE.MAKEFILES:M*prog.mk} != ""
  21 what_thing?= ${PROGNAME:U${PROG}}
  22 what_build_thing?= ${PROG}
  23 .elif defined(LIB) && ${.MAKE.MAKEFILES:M*lib.mk} != ""
  24 # probably only makes sense for shared libs
  25 # and the plumbing needed varies depending on *lib.mk
  26 what_thing?= lib${LIB}
  27 .if !empty(SOBJS)
  28 _soe:= ${SOBJS:E:[1]}
  29 what_build_exts= ${_soe}
  30 SOBJS+= ${what_uuid}.${_soe}
  31 .endif
  32 .elif defined(KMOD) && ${.MAKE.MAKEFILES:M*kmod.mk} != ""
  33 what_thing?= ${KMOD}
  34 what_build_thing?= ${KMOD}.ko
  35 .endif
  36
  37 .if !empty(what_thing)
  38 # a unique name that won't conflict with anything
  39 what_uuid = what_${.CURDIR:T:hash}
  40
  41 .if !empty(what_build_thing)
  42 ${what_build_thing}: ${what_build_exts:@e@${what_uuid}.$e@}
  43 .endif
  44 OBJS+= ${what_uuid}.o
  45 CLEANFILES+= ${what_uuid}.c
  46
  47 # we do not need to capture this
  48 SUPPRESS_DEPEND+= *${what_uuid}.c
  49
  50 SB?= ${SRCTOP:H}
  51 SB_LOCATION?= ${HOST}:${SB}
  52 what_location:= ${.OBJDIR:S,${SB},${SB_LOCATION},}
  53
  54 # this works with clang and gcc
  55 _what_t= const char __attribute__ ((section(".data")))
  56 _what1:= @(\#)${what_thing:tu} built ${%Y%m%d:L:localtime} by ${USER}
  57 _what2:= @(\#)${what_location}
  58
  59 ${what_uuid}.c:
  60         echo '${_what_t} ${what_uuid}1[] = "${_what1}";' > $@ ${.OODATE:MNO_META_CMP}
  61         echo '${_what_t} ${what_uuid}2[] = "${_what2}";' >> $@
  62 .endif
  63 .endif