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The llvm-ar command guide had not been updated in some time, it was missing current functionality and contained information that was out of date. This change: - Updates the use of reStructuredText directives, as seen in other tools command guides. - Updates the command synopsis. - Updates the descriptions of the tool behaviour. - Updates the options section. - Adds details of MRI script functionality. - Removes the sections "Standards" and "File Format" Differential Revision: https://reviews.llvm.org/D68998 llvm-svn: 375412
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348 lines
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llvm-ar - LLVM archiver
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=======================
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.. program:: llvm-ar
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SYNOPSIS
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--------
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:program:`llvm-ar` [-]{dmpqrstx}[abcDilLNoOPsSTuUvV] [relpos] [count] archive [files...]
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DESCRIPTION
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-----------
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The :program:`llvm-ar` command is similar to the common Unix utility,
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:program:`ar`. It archives several files, such as objects and LLVM bitcode
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files into a single archive library that can be linked into a program. However,
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the archive can contain any kind of file. By default, :program:`llvm-ar`
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generates a symbol table that makes linking faster because only the symbol
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table needs to be consulted, not each individual file member of the archive.
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The :program:`llvm-ar` command can be used to *read* archive files in SVR4,
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GNU, BSD and Darwin format, and *write* in the GNU, BSD, and Darwin style
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archive files. If an SVR4 format archive is used with the :option:`r`
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(replace), :option:`d` (delete), :option:`m` (move) or :option:`q`
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(quick update) operations, the archive will be reconstructed in the format
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defined by :option:`--format`.
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Here's where :program:`llvm-ar` departs from previous :program:`ar`
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implementations:
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*The following option is not supported*
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[f] - truncate inserted filenames
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*The following options are ignored for compatibility*
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--plugin=<string> - load a plugin which adds support for other file formats
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[l] - ignored in :program:`ar`
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*Symbol Table*
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Since :program:`llvm-ar` supports bitcode files, the symbol table it creates
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includes both native and bitcode symbols.
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*Deterministic Archives*
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By default, :program:`llvm-ar` always uses zero for timestamps and UIDs/GIDs
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to write archives in a deterministic mode. This is equivalent to the
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:option:`D` modifier being enabled by default. If you wish to maintain
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compatibility with other :program:`ar` implementations, you can pass the
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:option:`U` modifier to write actual timestamps and UIDs/GIDs.
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*Windows Paths*
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When on Windows :program:`llvm-ar` treats the names of archived *files* in the same
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case sensitive manner as the operating system. When on a non-Windows machine
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:program:`llvm-ar` does not consider character case.
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OPTIONS
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-------
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:program:`llvm-ar` operations are compatible with other :program:`ar`
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implementations. However, there are a few modifiers (:option:`L`) that are not
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found in other :program:`ar` implementations. The options for
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:program:`llvm-ar` specify a single basic Operation to perform on the archive,
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a variety of Modifiers for that Operation, the name of the archive file, and an
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optional list of file names. If the *files* option is not specified, it
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generally means either "none" or "all" members, depending on the operation. The
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Options, Operations and Modifiers are explained in the sections below.
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The minimal set of options is at least one operator and the name of the
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archive.
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Operations
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~~~~~~~~~~
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.. option:: d [NT]
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Delete files from the ``archive``. The :option:`N` and :option:`T` modifiers
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apply to this operation. The *files* options specify which members should be
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removed from the archive. It is not an error if a specified file does not
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appear in the archive. If no *files* are specified, the archive is not
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modified.
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.. option:: m [abi]
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Move files from one location in the ``archive`` to another. The :option:`a`,
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:option:`b`, and :option:`i` modifiers apply to this operation. The *files*
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will all be moved to the location given by the modifiers. If no modifiers are
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used, the files will be moved to the end of the archive. If no *files* are
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specified, the archive is not modified.
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.. option:: p [v]
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Print *files* to the standard output stream. If no *files* are specified, the
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entire ``archive`` is printed. With the :option:`v` modifier,
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:program:`llvm-ar` also prints out the name of the file being output. Printing
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binary files is ill-advised as they might confuse your terminal settings. The
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:option:`p` operation never modifies the archive.
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.. option:: q [LT]
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Quickly append files to the end of the ``archive`` without removing
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duplicates. If no *files* are specified, the archive is not modified. The
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behavior when appending one archive to another depends upon whether the
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:option:`L` and :option:`T` modifiers are used:
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* Appending a regular archive to a regular archive will append the archive
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file. If the :option:`L` modifier is specified the members will be appended
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instead.
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* Appending a regular archive to a thin archive requires the :option:`T`
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modifier and will append the archive file. The :option:`L` modifier is not
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supported.
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* Appending a thin archive to a regular archive will append the archive file.
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If the :option:`L` modifier is specified the members will be appended
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instead.
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* Appending a thin archive to a thin archive will always quick append its
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members.
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.. option:: r [abTu]
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Replace existing *files* or insert them at the end of the ``archive`` if
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they do not exist. The :option:`a`, :option:`b`, :option:`T` and :option:`u`
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modifiers apply to this operation. If no *files* are specified, the archive
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is not modified.
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t[v]
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.. option:: t [vO]
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Print the table of contents. Without any modifiers, this operation just prints
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the names of the members to the standard output stream. With the :option:`v`
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modifier, :program:`llvm-ar` also prints out the file type (B=bitcode,
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S=symbol table, blank=regular file), the permission mode, the owner and group,
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are ignored when extracting *files* and set to placeholder values when adding
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size, and the date. With the :option:`O` modifier, display member offsets. If
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any *files* are specified, the listing is only for those files. If no *files*
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are specified, the table of contents for the whole archive is printed.
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.. option:: V
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A synonym for the :option:`--version` option.
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.. option:: x [oP]
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Extract ``archive`` members back to files. The :option:`o` modifier applies
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to this operation. This operation retrieves the indicated *files* from the
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archive and writes them back to the operating system's file system. If no
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*files* are specified, the entire archive is extracted.
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Modifiers (operation specific)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The modifiers below are specific to certain operations. See the Operations
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section to determine which modifiers are applicable to which operations.
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.. option:: a
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When inserting or moving member files, this option specifies the destination
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of the new files as being after the *relpos* member. If *relpos* is not found,
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the files are placed at the end of the ``archive``. *relpos* cannot be
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consumed without either :option:`a`, :option:`b` or :option:`i`.
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.. option:: b
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When inserting or moving member files, this option specifies the destination
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of the new files as being before the *relpos* member. If *relpos* is not
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found, the files are placed at the end of the ``archive``. *relpos* cannot
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be consumed without either :option:`a`, :option:`b` or :option:`i`. This
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modifier is identical to the :option:`i` modifier.
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.. option:: i
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A synonym for the :option:`b` option.
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.. option:: L
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When quick appending an ``archive``, instead quick append its members. This
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is a feature for :program:`llvm-ar` that is not found in gnu-ar.
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.. option:: N
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When extracting or deleting a member that shares its name with another member,
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the *count* parameter allows you to supply a positive whole number that
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selects the instance of the given name, with "1" indicating the first
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instance. If :option:`N` is not specified the first member of that name will
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be selected. If *count* is not supplied, the operation fails.*count* cannot be
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.. option:: o
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When extracting files, use the modification times of any *files* as they
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appear in the ``archive``. By default *files* extracted from the archive
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use the time of extraction.
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.. option:: O
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Display member offsets inside the archive.
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.. option:: T
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When creating or modifying an archive, this option specifies that the
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``archive`` will be thin. By default, archives are not created as thin
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archives and when modifying a thin archive, it will be converted to a regular
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archive.
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.. option:: v
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When printing *files* or the ``archive`` table of contents, this modifier
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instructs :program:`llvm-ar` to include additional information in the output.
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Modifiers (generic)
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~~~~~~~~~~~~~~~~~~~
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The modifiers below may be applied to any operation.
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.. option:: c
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For the :option:`r` (replace)and :option:`q` (quick update) operations,
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:program:`llvm-ar` will always create the archive if it doesn't exist.
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Normally, :program:`llvm-ar` will print a warning message indicating that the
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``archive`` is being created. Using this modifier turns off
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that warning.
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.. option:: D
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Use zero for timestamps and UIDs/GIDs. This is set by default.
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.. option:: P
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Use full paths when matching member names rather than just the file name.
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This can be useful when manipulating an ``archive`` generated by another
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archiver, as some allow paths as member names. This is the default behavior
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for thin archives.
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.. option:: s
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This modifier requests that an archive index (or symbol table) be added to the
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``archive``, as if using ranlib. The symbol table will contain all the
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externally visible functions and global variables defined by all the bitcode
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files in the archive. By default :program:`llvm-ar` generates symbol tables in
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archives. This can also be used as an operation.
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.. option:: S
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This modifier is the opposite of the :option:`s` modifier. It instructs
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:program:`llvm-ar` to not build the symbol table. If both :option:`s` and
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:option:`S` are used, the last modifier to occur in the options will prevail.
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.. option:: u
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Only update ``archive`` members with *files* that have more recent
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timestamps.
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.. option:: U
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Use actual timestamps and UIDs/GIDs.
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Other
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~~~~~
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.. option:: --format=<type>
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This option allows for default, gnu, darwin or bsd ``<type>`` to be selected.
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When creating an ``archive``, ``<type>`` will default to that of the host
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machine.
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.. option:: -h, --help
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Print a summary of command-line options and their meanings.
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.. option:: -M
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This option allows for MRI scripts to be read through the standard input
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stream. No other options are compatible with this option.
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.. option:: --version
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Display the version of the :program:`llvm-ar` executable.
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.. option:: @<FILE>
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Read command-line options and commands from response file ``<FILE>``.
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MRI SCRIPTS
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-----------
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:program:`llvm-ar` understands a subset of the MRI scripting interface commonly
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supported by archivers following in the ar tradition. An MRI script contains a
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sequence of commands to be executed by the archiver. The :option:`-M` option
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allows for an MRI script to be passed to :program:`llvm-ar` through the
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standard input stream.
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Note that :program:`llvm-ar` has known limitations regarding the use of MRI
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scripts:
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* Each script can only create one archive.
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* Existing archives can not be modified.
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MRI Script Commands
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~~~~~~~~~~~~~~~~~~~
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Each command begins with the command's name and must appear on its own line.
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Some commands have arguments, which must be separated from the name by
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whitespace. An MRI script should begin with either a :option:`CREATE` or
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:option:`CREATETHIN` command and will typically end with a :option:`SAVE`
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command. Any text after either '*' or ';' is treated as a comment.
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.. option:: CREATE archive
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Begin creation of a regular archive with the specified name. Subsequent
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commands act upon this ``archive``.
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.. option:: CREATETHIN archive
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Begin creation of a thin archive with the specified name. Subsequent
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commands act upon this ``archive``.
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.. option:: ADDLIB archive
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Append the contents of ``archive`` to the current archive.
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.. option:: ADDMOD <file>
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Append ``<file>`` to the current archive.
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.. option:: DELETE <file>
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Delete the member of the current archive whose file name, excluding directory
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components, matches ``<file>``.
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.. option:: SAVE
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Write the current archive to the path specified in the previous
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:option:`CREATE`/:option:`CREATETHIN` command.
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.. option:: END
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Ends the MRI script (optional).
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EXIT STATUS
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-----------
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If :program:`llvm-ar` succeeds, it will exit with 0. Otherwise, if an error occurs, it
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will exit with a non-zero value.
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