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.
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.
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]
23 # Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24 # Use is subject to license terms.
25 # Copyright 2015 Igor Kozhukhov <ikozhukhov@gmail.com>
28 include $(SRC
)/Makefile.master
31 $(__GNUC
)FILES
= $(MACH
)_gcc_map.noexeglobs
32 $(__SUNC
)FILES
= $(MACH
)_cc_map.noexeglobs
34 $(__GNUC
)$(BUILD64
)FILES
+= $(MACH64
)_gcc_map.noexeglobs
35 $(__SUNC
)$(BUILD64
)FILES
+= $(MACH64
)_cc_map.noexeglobs
42 TEMPLATE1
= map.noexeglobs
.1.template
43 TEMPLATE2
= map.noexeglobs
.2.template
50 $(RM
) $(SYMS1
) $(SYMS2
) $(MAIN1
) $(MAIN2
)
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.
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.
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
)
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.
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
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
)