Stripping binaries how much archive
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. Treat the original objfile as a file with the object code format bfdnameand rewrite it in the same format. See Target Selectionfor more information. Treat the original objfile as a file with the object code format bfdname. Replace objfile with a file in the output format bfdname.
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. If so, then any section starting with sectionname will be removed. If the first character of sectionpattern is the exclamation point! Remove relocations from the output file for any section matching sectionpattern. Wildcard characters are accepted in sectionpattern.
See the description of this option in the objcopy section for more information. When stripping symbols, keep symbol symbolname even if it would normally be stripped. The default is to attempt this reduction. Remove symbol symbolname from the source file. This option may be given more than once, and may be combined with strip options other than stripping binaries how much archive.
Put the stripped output in filerather than replacing the existing file. When this argument is used, only one objfile stripping binaries how much archive may be specified. 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-archivesthen this mode is on by default.
Do not operate in deterministic mode. This is the inverse of the -D option, above: This is the default unless binutils was configured with --enable-deterministic-archives. Permit regular expressions in symbolname s used in other command line options.
If the first character of the symbol name is the exclamation point! Remove compiler-generated local symbols. When stripping a file, perhaps with --strip-debug or --strip-unneededretain any symbols specifying source file names, which would otherwise get stripped. Strip a stripping binaries how much archive, emptying the stripping binaries how much archive 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 - stripping binaries how much archive 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:. Also the stripping binaries how much archive step is optional. You could instead do this:. 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.
Create, modify, and extract from archives nm: List symbols from object files objcopy: Copy and translate object files objdump: Display information from object files ranlib: Generate index to archive contents size: List section sizes and total size strings: List printable strings from files strip: Convert addresses to file and line nlmconv: Stripping binaries how much archive object code into an NLM windmc: Generator for Windows message resources windres: Manipulate Windows resources dlltool: Create files needed to build and use DLLs readelf: Display the contents of ELF format files elfedit: Command-line options for all utilities Selecting the Target System: How these utilities determine the target Reporting Bugs: Top 1 ar ar [-] p [ mod ] [ --plugin name ] [ --target bfdname ] [ relpos ] [ count ] archive [ member An archive is a single file holding stripping binaries how much archive collection of other files in a structure that makes it possible to retrieve the original individual stripping binaries how much archive called members of the archive.
The original files' contents, mode permissionstimestamp, owner, and group are preserved in the archive, and can be restored on extraction. If it exists, the limit is often 15 characters typical of formats related to a. An archive with such an index speeds up linking to the library, and allows routines in the library to call each other without regard to their placement in the archive. If an archive lacks the table, another form of ar called ranlib can be used to add just the table.
This is useful for building libraries for use within a local build tree, where the relocatable objects are expected to remain available, stripping binaries how much archive copying the contents of each object would only waste time and space.
An archive can either be thin or it can be normal. It cannot be both at the same time. Once an archive stripping binaries how much archive created its format cannot be changed without first deleting it and then creating a new archive in its place. Thin archives are also flattenedso that adding one thin archive to another thin archive does not nest it, as would happen with a normal archive.
Instead the elements of the first archive are added individually to the second archive. The paths to the elements of the archive are stored relative to the archive itself.
Controlling ar on the command line ar scripts: Controlling ar with a script Next: Most operations can also accept further member arguments, specifying particular files to operate on. If you wish, you may begin the first command-line argument with a dash.
The p keyletter specifies what operation to execute; it may be any of the following, but you must specify only one of them: Specify the names of modules to be deleted as member The ordering of members stripping binaries how much archive an archive can make a difference in how programs are linked using the library, if a symbol is defined in more than one member.
If you specify no member arguments, all the files in the archive are printed. Since the point of this operation is speed, implementations of ar have the option of not updating the archive's symbol table if one exists. Too many different systems however assume that symbol tables are always up-to-date, so gnu ar will rebuild the table even with a quick append. If one of the files named stripping binaries how much archive member Note this command is an exception to the rule that there can only be one command letter, as it is possible to use it as either a command or a modifier.
In either case it does the same thing. If you do not specify a memberall files in the archive are listed. If you do not specify a memberall files in the archive are extracted.
Files cannot be extracted from a thin archive. A number of modifiers mod may immediately follow the p keyletter, to specify variations on an operation's behavior: The specified archive is always created if it did not exist, when you request an update. But a warning is issued unless you specify in advance that stripping binaries how much archive expect to create it, by using this modifier.
When adding files and the archive index use zero for UIDs, GIDs, timestamps, and use consistent file modes for all files. When this option stripping binaries how much archive used, if ar is used with identical options and identical input files, multiple runs will create identical output files regardless of the input files' owners, groups, file modes, or modification times.
If binutils was configured with --enable-deterministic-archivesthen this mode is on by default. This will cause it to create archives which are not compatible with the native ar program on some systems.
This is used if there are multiple entries in the archive with the same name. Extract or delete instance count of the given name from the archive. If you do not specify this modifier, files extracted from the archive are stamped stripping binaries how much archive the time of extraction.
This option will cause gnu ar to match file names using a complete path name, which can be convenient when extracting a single file from an archive created by another tool. You may use this modifier flag either with any operation, or alone.
This can speed up building a large library in several stripping binaries how much archive. The resulting archive can not be used with the linker. If it already exists and is a regular archive, the existing members must be present in the same directory as archive. If you would like to insert only those of the files you list that are newer than existing members of the same names, use this modifier. This is the default unless binutils was configured with --enable-deterministic-archives.
The ar program also supports some command line options which are neither modifiers nor actions, but which do change its behaviour in specific ways: The behaviour produced by this option is the default for gnu ar. This option is only available if the toolchain has been built with plugin support enabled.
Stripping binaries how much archive note that this plugin search directory is not the one used by ld 's -plugin option. The GCC plugin is always backwards compatible with earlier versions, so it is sufficient to just copy the newest one. See See Target Selectionfor more information. This form of ar operates interactively if standard input is coming directly from a terminal.
If you redirect standard input to a script file, no prompts are issued, and ar abandons execution with a nonzero exit code on any error. The ar command language is not designed to be equivalent to the stripping binaries how much archive options; in fact, it provides somewhat less control over archives. The syntax for the ar command language is straightforward: In the following descriptions, commands are shown in upper case for clarity.
Whenever you use a list of names as part of the argument to an ar command, you can separate the individual names with either commas or blanks. Commas are shown in the explanations below, for clarity. Here are the commands you can use in ar scripts, or when using ar interactively.
Three of them have special significance: SAVE commits the changes so far specified by the script. Prior to SAVEcommands affect only the temporary copy of the current archive.
May be executed with no effect even if no current archive is specified. The new archive is created with a temporary name; it is not actually saved as archive until you use SAVE. You can overwrite existing archives; similarly, the contents of any existing file named archive will not be destroyed until SAVE.
Output normally goes to the standard output stream; however, if you specify outputfile as a final argument, ar directs the output to that file.
END Exit from arwith a 0 exit code to indicate successful completion. This command does not save the output file; if you have changed the current archive since the last SAVE command, those changes are lost.
This single command is a gnu ar enhancement, stripping binaries how much archive than present for MRI compatibility. OPEN archive Opens an existing archive for use as the current archive required for many other commands. Any stripping binaries how much archive as the result of subsequent commands will not actually affect archive until you next use SAVE.
To execute this command without errors, both the file, and the module in the current archive, must exist. If no object files are listed as arguments, nm assumes the file a. For each symbol, nm shows: The symbol value, in the radix selected by options see belowor hexadecimal by default. At least the following types are used; others are, as well, depending on the object file format. If lowercase, the symbol is usually local; if uppercase, the symbol is stripping binaries how much archive external.
There are however a stripping binaries how much archive lowercase symbols that are shown for special global symbols uv and w. A The symbol's value is absolute, and will not be changed by further linking. B b The symbol is in the uninitialized data section known as BSS. C The symbol is common. Common symbols are uninitialized data.
When linking, multiple common symbols may appear with the same name.