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elfcompress(1)
elfcompress(1) User Commands elfcompress(1)
NAME
elfcompress - compress/decompress debug sections of an object file
SYNOPSIS
elfcompress [-fV] [-c [!]class1,[!]class2,... | -n name]
[-t cmp-type[,cmp-opt...]] file...
DESCRIPTION
The elfcompress command is used to compress or decompress sections in
ELF object files. Unless otherwise specified, all debug and annotate
sections are manipulated.
If the input file is an archive (see ar.h(3HEAD)), the archive is
treated as a set of individual files. If the archive member is not an
object file, then it is left unchanged.
elfcompress cannot modify a section that is contained within a segment.
Such allocable sections have their SHF_ALLOC section flag set. elfcom‐
press cannot modify sections of type SHT_NOBITS. The compression opera‐
tion specified with the-t option may place additional limits on candi‐
date sections. See the -t option, and NOTES.
When the -n option is used to specify one or more sections to process,
only the specified sections are processed, and all other sections are
left unmodified.
When the -n option is not used, elfcompress processes sections selected
by the -c option that are compatible with the compression format speci‐
fied with the -t option. By default, debug and annotate sections are
compressed using the zlib format.
OPTIONS
The following options are supported:
-c [!]class1,[!]class2,...
Specify candidate sections. This option provides fine grained con‐
trol over the selection of candidate sections to be manipulated. -c
is used in conjunction with the -t option. If the -c option is not
specified, elfcompress will default to the annotate and debug
classes.
Each section class token can be prepended with a '!' to indicate
that the class should not be a candidate.
The following classes of section can be defined.
nonalloc
Process any non-allocatable section. These sections are identi‐
fied as not including the SHF_ALLOC section flag. This class
encapsulates all of the other classes, except for the shstrtab
class.
annotate
Process any annotation section. These sections provide informa‐
tion that is used by memory access tools, and coverage related
tools. These sections are identified by having a SHT_SUNW_ANNO‐
TATE section type.
comment
Process any comment section. These sections are identified by
having a .comment section name.
debug
Process sections commonly used to contain debugging data. Debug
sections are identified by having a .compcom, .debug*, .line,
.stab*, .SUNW_ctf, or .zdebug* section name. These sections are
also identified by having an SHT_PROGBITS, SHT_SUNW_DEBUG, or
SHT_SUNW_DEBUGSTR section type.
shstrtab
Process the .shstrtab section used to hold ELF section names.
This option is intended for specialized dynamic objects, and is
not recommended for general use.
sort_sym_addr, sort_sym_name, sort, sort_sym
Process the symbol sort sections associated to SHT_SYMTAB sym‐
bol tables. Each of these symbol tables typically have associ‐
ated symbol sort sections, sorted by address, and by name.
sort_sym_addr By-address .symtab symbol sort sections
(SHT_SUNW_symsort, SHT_SUNW_tlssort).
sort_sym_name By-name .symtab symbol sort sections
(SHT_SUNW_symnsort).
sort, sort_sym All .symtab symbol sort sections. Equivalent
to specifying both sort_sym_addr and
sort_sym_name.
symbol
Process any non-allocatable symbol table. These sections are
identified by having a SHT_SYMTAB section type. This class also
encapsulates the sort classes. Any associated string table or
symbol sort sections are also processed.
-f
By default, elfcompress will only compress sections if their
resulting size is equal to or smaller than the original data. Spec‐
ify -f to force compression even when the resulting size is larger
than the original. The -f option is equivalent to specifying the -t
force option.
-n name
Specifies the name of the section to process. elfcompress can take
multiple -n options to allow for specification of multiple sec‐
tions. If -n is not used, elfcompress selects all debug sections
that are compatible with the specified compression operation. See
the -t option, and NOTES.
-t cmp-type[,cmp-opt...]
Specifies the compression operation to be performed. If the -t
option is not specified, elfcompress will default to zlib. The fol‐
lowing compression types are recognized.
none
Compressed sections are decompressed.
zlib
Compress debug sections with ZLIB compression. The candidate
sections for compression can be specified using the -c option.
If -c is not present, elfcompress defaults to compressing anno‐
tate and debug sections, as if the -c annotate,debug option
had been set. The resulting sections will have the SHF_COM‐
PRESSED section flag set to identify the use of compression.
zlib-gnu
Compress debug sections with ZLIB compression, using the GNU
section compression format. Candidate sections must be non-
allocable (SHF_ALLOC flag not set), cannot have type
SHT_NOBITS, and must have a name that begins with .debug. The
resulting section will be renamed to start with .zdebug, to
identify the use of compression.
The following cmp-opt option can be specified.
force
By default, elfcompress will only compress sections if their
resulting size is equal to or smaller than the original data.
Specify force to force compression even when the resulting size
is larger than the original.
-V
--version
Print version information.
-?
--help
Print usage message and immediately exit.
NOTES
The zlib-gnu compression format is limited to sections with names that
start with .debug, while the default zlib compression format can be
applied to sections with arbitrary names. When -t zlib-gnu is speci‐
fied, and the -n option is not, any previously compressed sections with
names that are incompatible with the zlib-gnu format are decompressed.
The elfcompress command is unable to modify core files.
The elfcompress -c and -t options correspond to the ld -z compress-
class and -z compress-sections options, respectively. Performing these
operations at link-edit time, rather than using elfcompress to post
process objects is more efficient, but otherwise equivalent. See ld(1).
EXAMPLES
Example 1 Apply zlib compression to all debug sections
% elfcompress file
Example 2 Decompress all debug sections
% elfcompress -t none file
Example 3 Compress the .debug_info section, using the GNU-style format
% elfcompress -t zlib-gnu -n .debug_info file
Example 4 Compress the .symtab symbol table and all related sections
% elfcompress -c symbol file
Example 5 Compress .symtab symbol table and all related sections,
excluding symbol sort sections
% elfcompress -c 'symbol,!sort' file
FILES
/tmp/elfcompress_* temporary files
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Availabilitydeveloper/base-developer-utilities _ Inter‐
face StabilityCommitted
SEE ALSO
ar(1), as(1), ld(1), mcs(1), strip(1), elf(3ELF), ar.h(3HEAD), zlib(3),
a.out(5), attributes(7)
Oracle Solaris 11.4 Linkers and Libraries Guide
Oracle Solaris 11.4 6 January 2020 elfcompress(1)