Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Uživatelský manuál stáhnout pdf (Strana 12)

6 Chapter 2. ar

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.

Write an object-ﬁle index into the archive, or update an existing one, even if no other change is

made to the archive. You may use this modiﬁer ﬂag either with any operation, or alone. Running

ar s on an archive is equivalent to running ranlib on it.

Do not generate an archive symbol table. This can speed up building a large library in several

steps. The resulting archive can not be used with the linker. In order to build a symbol table, you

must omit the S modiﬁer on the last execution of ar, or you must run ranlib on the archive.

Normally, ar r. . . inserts all ﬁles listed into the 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. The

u modiﬁer is allowed only for the operation r (replace). In particular, the combination qu is not

allowed, since checking the timestamps would lose any speed advantage from the operation q.

This modiﬁer requests the verbose version of an operation. Many operations display additional

information, such as ﬁlenames processed, when the modiﬁer v is appended.

This modiﬁer shows the version number of ar.

ar ignores an initial option spelt -X32_64, for compatibility with AIX. The behaviour produced by

this option is the default for gnu ar. ar does not support any of the other -X options; in particular, it

does not support -X32 which is the default for AIX ar.

2.2. Controlling arwith a Script

ar -M [

script ]

If you use the single command-line option -M with ar, you can control its operation with a rudimen-

tary command language. This form of ar operates interactively if standard input is coming directly

from a terminal. During interactive use, ar prompts for input (the prompt is AR ), and continues

executing even after errors. 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 command-line options; in fact,

it provides somewhat less control over archives. The only purpose of the command language is to

ease the transition to gnu ar for developers who already have scripts written for the MRI "librarian"

program.

The syntax for the ar command language is straightforward:

• commands are recognized in upper or lower case; for example, LIST is the same as list. In the

following descriptions, commands are shown in upper case for clarity.

• a single command may appear on each line; it is the ﬁrst word on the line.

• empty lines are allowed, and have no effect.

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Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Uživatelský manuál Strana 12