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22 .TH INTERFACE_CMP 1ONBLD "Mar 25, 2010"
24 interface_cmp \- compare shared object interface descriptions
26 \fBinterface_cmp [-dot] [-e exfile] old new\fP
30 command compares the interface definition files for two workspaces
31 and reports versioning inconsistencies. Interface definition
36 is typically called from \fBnightly(1ONBLD)\fP when the \fB-A\fP
37 option is in effect following the creation of a new database by
40 interface consistency between successive software releases, existing
41 version definitions and their symbol association should remain intact.
42 Any discrepancies between the two interface definitions are flagged as
45 Note that version definition inheritance has the effect of causing a
46 symbol to be viewed as existing in multiple definitions. This insures
47 that both version definitions and their inheritance relationship are
48 processed as part of the comparison.
50 The following options are supported:
55 is customized for the versioning conventions used by the Solaris
56 OSnet code base. This specialized information, which includes
57 the recognition of the SUNW_ prefix and other special names, is
58 contained in a perl module named onbld_elfmod_vertype.pm, which
59 is delivered with the SUNWonbld tools. This module is loaded by
61 at runtime. The \fB-c\fP option can be used to supply
62 an alternative module, customized for a different code base, allowing
64 to operate on code from other projects. The alternative module must
65 supply the same module and calling interfaces as the standard module.
68 Asserts that the \fBnew\fP interface is a direct descendant of
69 \fBold\fP. If so, the following additional checks are enabled:
74 The top version of an inheritance chain must not increase
81 The new interface must not add new empty versions. Pre-existing empty
82 versions represent public interfaces that cannot be changed, but new
83 ones should be removed before the product ships.
88 An exception file is used to exclude objects from
89 the usual rules. See EXCEPTION FILE FORMAT.
92 Produce one-liner output, with each line of diagnostic output
93 prefixed with the object pathname.
96 If the \fB-t\fP option is present, only one argument is allowed.
97 The interface description file is parsed, and then regenerated on
98 stdout in the same format used by the
100 \fB-I\fP option. The \fB-I\fP output from
105 should be identical, excluding header comments.
106 This is a debugging feature, and not intended for general use.
107 .SH EXCEPTION FILE FORMAT
108 Exceptions to the rules enforced by
110 are specified using an exception file. The \fB-e\fP option is used to
111 specify an explicit exception file. Otherwise, if used in an activated
112 workspace, the default exception file is
113 $SRCTOP/exception_list/interface_cmp
114 if that file exists. If not used in an activated workspace, or if
115 $SRCTOP/exception_list/interface_cmp does not exist,
118 .I /opt/onbld/etc/exception_list/interface_cmp
119 as a fallback default exception file.
123 without applying exceptions, specify \fB-e\fP with a value of /dev/null.
125 A '#' character at the beginning of a line, or at any point in
126 a line when preceded by whitespace, introduces a comment. Empty lines,
127 and lines containing only comments, are ignored by
129 Exceptions are specified as space separated keyword, and \fBperl(1)\fP
130 regular expressions. The number of regular expressions depends on the
131 particular exception in questions:
135 keyword perl-regex...
139 Since whitespace is used as a separator, the regular
140 expression cannot itself contain whitespace. Use of the \\s character
141 class to represent whitespace within the regular expression is recommended.
142 Before the perl regular expression is used, constructs of the form
143 MACH(dir) are expanded into a regular expression that matches the directory
144 given, as well as any 64-bit architecture subdirectory that
145 might be present (i.e. amd64, sparcv9). For instance, MACH(lib) will
146 match any of the following:
156 The exceptions understood by
162 \fBADDSYM\fR sym_re version_re object_re
166 The interfaces in a given version are not supposed to change.
168 will normally issue an error if a new interface is added to a previously
169 released version. ADDSYM is used to override this
170 requirement. If the added symbol, version, and object match
171 the regular expressions specified by ADDSYM, the added symbol is ignored.
177 \fBDELDYM\fR sym_re version_re object_re
181 Once released to the public, interfaces are required to remain available
182 in subsequent releases. DELSYM is used to override this
183 requirement, as can occur when interfaces are EOL'd. Such an action generally
184 requires a PSARC case. If the deleted symbol, version, and object match
185 the regular expressions specified by DELSYM, the deleted symbol is ignored.
191 \fBEMPTY_TOPVERSION\fR version_re object_re
197 normally issues an error if the old object has an empty top version
198 that is non-empty in the new object. Such a situation is normally
199 an error, but may legitimately occur as part of a fix to another versioning
200 error. If the version, and object match
201 the regular expressions specified by EMPTY_TOPVERSION, the error is suppressed.
205 The following example uses
207 to compare this releases interface definition with a previous
212 .B % interface_cmp -d -o $SRC/ELF-data.$MACH.ref/interfaces\ \\\\
213 .B \ \ \ \ \ \ \ $SRC/ELF-data.$MACH/interfaces
214 lib/libadm.so.1: SUNW_1.1: added interface: circf(4)
215 lib/libaio.so.1: SUNW_1.1: deleted interface: _aiocancel
220 Note: the above comparison files were doctored in order to provide
221 the example, they do not indicate any real changes that have
222 occurred in the associated system libraries.
225 .BR find_elf(1ONBLD),
226 .BR interface_check(1ONBLD),