usr/src/common/mapfiles/gen/Makefile

   1 #
   2 # CDDL HEADER START
   3 #
   4 # The contents of this file are subject to the terms of the
   5 # Common Development and Distribution License (the "License").
   6 # You may not use this file except in compliance with the License.
   7 #
   8 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9 # or http://www.opensolaris.org/os/licensing.
  10 # See the License for the specific language governing permissions
  11 # and limitations under the License.
  12 #
  13 # When distributing Covered Code, include this CDDL HEADER in each
  14 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15 # If applicable, add the following below this CDDL HEADER, with the
  16 # fields enclosed by brackets "[]" replaced with your own identifying
  17 # information: Portions Copyright [yyyy] [name of copyright owner]
  18 #
  19 # CDDL HEADER END
  20 #
  21
  22 #
  23 # Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24 # Use is subject to license terms.
  25 # Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com>
  26 #
  27
  28 include         $(SRC)/Makefile.master
  29
  30
  31 $(__GNUC)FILES= $(MACH)_gcc_map.noexeglobs
  32 $(__SUNC)FILES= $(MACH)_cc_map.noexeglobs
  33
  34 $(__GNUC)$(BUILD64)FILES += $(MACH64)_gcc_map.noexeglobs
  35 $(__SUNC)$(BUILD64)FILES += $(MACH64)_cc_map.noexeglobs
  36
  37 SYMS1=          syms.1
  38 SYMS2=          syms.2
  39 MAIN1=          main.1
  40 MAIN2=          main.2
  41
  42 TEMPLATE1=      map.noexeglobs.1.template
  43 TEMPLATE2=      map.noexeglobs.2.template
  44
  45 all install:    $(FILES)
  46
  47 lint:
  48
  49 clean:
  50                 $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2)
  51
  52 clobber:        clean
  53                 $(RM) $(FILES)
  54
  55 # A number of dynamic executables have their own definitions of interfaces that
  56 # exist in system libraries.  To prevent name-space pollution it is desirable
  57 # to demote the interfaces within these executable to locals.  However, various
  58 # symbols defined by the compiler drivers crt/values files need to remain
  59 # global in any dynamic object that includes these files.  These symbols
  60 # interpose on symbols in libc, or provide call backs for other system
  61 # libraries.  The various compiler drivers (cc and gcc), and the crt/values
  62 # files that these drivers are configured to include, differ between the
  63 # various compilations environments (platform, 32/64-bit).  Therefore, the
  64 # only means of creating a mapfile to demote symbols is to dynamically generate
  65 # the mapfile for a specific compilation environment.
  66 #
  67 # Here, template mapfiles are used to generate a number of compilation specific
  68 # mapfiles.  These mapfiles are referenced by components of the build through
  69 # the MAPFILE.NGB macro defined in Makefile.master.  These dynamically created
  70 # mapfiles are not delivered into the $ROOT area, and therefore are not
  71 # delivered as packaged components of the OSNet.
  72
  73 $(MACH)_cc_map.noexeglobs :=    LINK =  $(LINK.c)
  74 $(MACH64)_cc_map.noexeglobs :=  LINK =  $(LINK64.c)
  75 $(MACH)_gcc_map.noexeglobs :=   LINK =  $(LINK.c)
  76 $(MACH64)_gcc_map.noexeglobs := LINK =  $(LINK64.c)
  77
  78 # This generic target creates two dynamic executables from an empty "main"
  79 # program.  These objects are not executed, but are analyzed to determine the
  80 # global symbols each provides.
  81 #
  82 # The first executable demotes a family of known interfaces to local and allows
  83 # all other symbol definitions to remain global.  This executables provides the
  84 # base for discovering all symbol definitions provided by the various
  85 # compilation environments.  The second executable demotes all symbols to
  86 # locals.  Within both executables, some symbols remain globals (_end, _etext,
  87 # etc.) as the link-editor has special knowledge of these symbols and their
  88 # expected visibility requirements.  By inspecting the deferences between the
  89 # global symbols within the two executables, a mapfile can be generated to
  90 # ensure the symbols defined by the compilation environments files remain
  91 # global.
  92
  93 %map.noexeglobs:main.c $(TEMPLATE1) $(TEMPLATE2)
  94         $(LINK) -o $(MAIN1) -M$(TEMPLATE1) main.c
  95         $(ELFDUMP) -s -N.dynsym $(MAIN1) | $(EGREP) "WEAK|GLOB" | \
  96             $(GREP) -v UNDEF | $(AWK) '{print $$9 }' | $(SORT) > $(SYMS1)
  97         $(LINK) -o $(MAIN2) -M$(TEMPLATE2) main.c
  98         $(ELFDUMP) -s -N.dynsym $(MAIN2) | $(EGREP) "WEAK|GLOB" | \
  99             $(GREP) -v UNDEF | $(AWK) '{print $$9 }' | $(SORT) > $(SYMS2)
 100         $(ECHO) "# GENERATED FILE - DO NOT EDIT"        >  $@
 101         $(GREP) MAP-HEAD $(TEMPLATE2) | \
 102             $(SED) -e "s/       *# MAP-HEAD//"          >> $@
 103         $(DIFF) $(SYMS1) $(SYMS2) | $(GREP) "^<" | \
 104             $(SED) -e "s/^< \(.*\)/        \1;/"        >> $@
 105         $(GREP) MAP-TAIL $(TEMPLATE2) | \
 106             $(SED) -e "s/       *# MAP-TAIL//"          >> $@
 107         $(RM) $(SYMS1) $(SYMS2) $(MAIN1) $(MAIN2)