binutils: strip
8 strip
*******
strip [-F BFDNAME |--target=BFDNAME]
[-I BFDNAME |--input-target=BFDNAME]
[-O BFDNAME |--output-target=BFDNAME]
[-s|--strip-all]
[-S|-g|-d|--strip-debug]
[--strip-dwo]
[-K SYMBOLNAME|--keep-symbol=SYMBOLNAME]
[-M|--merge-notes][--no-merge-notes]
[-N SYMBOLNAME |--strip-symbol=SYMBOLNAME]
[-w|--wildcard]
[-x|--discard-all] [-X |--discard-locals]
[-R SECTIONNAME |--remove-section=SECTIONNAME]
[--remove-relocations=SECTIONPATTERN]
[-o FILE] [-p|--preserve-dates]
[-D|--enable-deterministic-archives]
[-U|--disable-deterministic-archives]
[--keep-file-symbols]
[--only-keep-debug]
[-v |--verbose] [-V|--version]
[--help] [--info]
OBJFILE...
GNU 'strip' discards all symbols from object files OBJFILE. The list
of object files may include archives. At least one object file must be
given.
'strip' modifies the files named in its argument, rather than writing
modified copies under different names.
'-F BFDNAME'
'--target=BFDNAME'
Treat the original OBJFILE as a file with the object code format
BFDNAME, and rewrite it in the same format. 
Target
Selection, for more information.
'--help'
Show a summary of the options to 'strip' and exit.
'--info'
Display a list showing all architectures and object formats
available.
'-I BFDNAME'
'--input-target=BFDNAME'
Treat the original OBJFILE as a file with the object code format
BFDNAME. Target Selection, for more information.
'-O BFDNAME'
'--output-target=BFDNAME'
Replace OBJFILE with a file in the output format BFDNAME.
Target Selection, for more information.
'-R SECTIONNAME'
'--remove-section=SECTIONNAME'
Remove any section named SECTIONNAME from the output file, in
addition to whatever sections would otherwise be removed. This
option may be given more than once. Note that using this option
inappropriately may make the output file unusable. The wildcard
character '*' may be given at the end of SECTIONNAME. If so, then
any section starting with SECTIONNAME will be removed.
If the first character of SECTIONPATTERN is the exclamation point
(!) then matching sections will not be removed even if an earlier
use of '--remove-section' on the same command line would otherwise
remove it. For example:
--remove-section=.text.* --remove-section=!.text.foo
will remove all sections matching the pattern '.text.*', but will
not remove the section '.text.foo'.
'--remove-relocations=SECTIONPATTERN'
Remove relocations from the output file for any section matching
SECTIONPATTERN. This option may be given more than once. Note
that using this option inappropriately may make the output file
unusable. Wildcard characters are accepted in SECTIONPATTERN. For
example:
--remove-relocations=.text.*
will remove the relocations for all sections matching the patter
'.text.*'.
If the first character of SECTIONPATTERN is the exclamation point
(!) then matching sections will not have their relocation removed
even if an earlier use of '--remove-relocations' on the same
command line would otherwise cause the relocations to be removed.
For example:
--remove-relocations=.text.* --remove-relocations=!.text.foo
will remove all relocations for sections matching the pattern
'.text.*', but will not remove relocations for the section
'.text.foo'.
'-s'
'--strip-all'
Remove all symbols.
'-g'
'-S'
'-d'
'--strip-debug'
Remove debugging symbols only.
'--strip-dwo'
Remove the contents of all DWARF .dwo sections, leaving the
remaining debugging sections and all symbols intact. See the
description of this option in the 'objcopy' section for more
information.
'--strip-unneeded'
Remove all symbols that are not needed for relocation processing.
'-K SYMBOLNAME'
'--keep-symbol=SYMBOLNAME'
When stripping symbols, keep symbol SYMBOLNAME even if it would
normally be stripped. This option may be given more than once.
'-M'
'--merge-notes'
'--no-merge-notes'
For ELF files, attempt (or do not attempt) to reduce the size of
any SHT_NOTE type sections by removing duplicate notes. The
default is to attempt this reduction.
'-N SYMBOLNAME'
'--strip-symbol=SYMBOLNAME'
Remove symbol SYMBOLNAME from the source file. This option may be
given more than once, and may be combined with strip options other
than '-K'.
'-o FILE'
Put the stripped output in FILE, rather than replacing the existing
file. When this argument is used, only one OBJFILE argument may be
specified.
'-p'
'--preserve-dates'
Preserve the access and modification dates of the file.
'-D'
'--enable-deterministic-archives'
Operate in _deterministic_ mode. When copying archive members and
writing the archive index, use zero for UIDs, GIDs, timestamps, and
use consistent file modes for all files.
If 'binutils' was configured with
'--enable-deterministic-archives', then this mode is on by default.
It can be disabled with the '-U' option, below.
'-U'
'--disable-deterministic-archives'
Do _not_ operate in _deterministic_ mode. This is the inverse of
the '-D' option, above: when copying archive members and writing
the archive index, use their actual UID, GID, timestamp, and file
mode values.
This is the default unless 'binutils' was configured with
'--enable-deterministic-archives'.
'-w'
'--wildcard'
Permit regular expressions in SYMBOLNAMEs used in other command
line options. The question mark (?), asterisk (*), backslash (\)
and square brackets ([]) operators can be used anywhere in the
symbol name. If the first character of the symbol name is the
exclamation point (!) then the sense of the switch is reversed for
that symbol. For example:
-w -K !foo -K fo*
would cause strip to only keep symbols that start with the letters
"fo", but to discard the symbol "foo".
'-x'
'--discard-all'
Remove non-global symbols.
'-X'
'--discard-locals'
Remove compiler-generated local symbols. (These usually start with
'L' or '.'.)
'--keep-file-symbols'
When stripping a file, perhaps with '--strip-debug' or
'--strip-unneeded', retain any symbols specifying source file
names, which would otherwise get stripped.
'--only-keep-debug'
Strip a file, emptying the contents of any sections that would not
be stripped by '--strip-debug' and leaving the debugging sections
intact. In ELF files, this preserves all the note sections in the
output as well.
Note - the section headers of the stripped sections are preserved,
including their sizes, but the contents of the section are
discarded. The section headers are preserved so that other tools
can match up the debuginfo file with the real executable, even if
that executable has been relocated to a different address space.
The intention is that this option will be used in conjunction with
'--add-gnu-debuglink' to create a two part executable. One a
stripped binary which will occupy less space in RAM and in a
distribution and the second a debugging information file which is
only needed if debugging abilities are required. The suggested
procedure to create these files is as follows:
1. Link the executable as normal. Assuming that it is called
'foo' then...
2. Run 'objcopy --only-keep-debug foo foo.dbg' to create a file
containing the debugging info.
3. Run 'objcopy --strip-debug foo' to create a stripped
executable.
4. Run 'objcopy --add-gnu-debuglink=foo.dbg foo' to add a link to
the debugging info into the stripped executable.
Note--the choice of '.dbg' as an extension for the debug info file
is arbitrary. Also the '--only-keep-debug' step is optional. You
could instead do this:
1. Link the executable as normal.
2. Copy 'foo' to 'foo.full'
3. Run 'strip --strip-debug foo'
4. Run 'objcopy --add-gnu-debuglink=foo.full foo'
i.e., the file pointed to by the '--add-gnu-debuglink' can be the
full executable. It does not have to be a file created by the
'--only-keep-debug' switch.
Note--this switch is only intended for use on fully linked files.
It does not make sense to use it on object files where the
debugging information may be incomplete. Besides the gnu_debuglink
feature currently only supports the presence of one filename
containing debugging information, not multiple filenames on a
one-per-object-file basis.
'-V'
'--version'
Show the version number for 'strip'.
'-v'
'--verbose'
Verbose output: list all object files modified. In the case of
archives, 'strip -v' lists all members of the archive.
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