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Chapter 16.

Selecting the Target System

You can specify two aspects of the target system to the gnu binary ﬁle utilities, each in several ways:

• the target

• the architecture

In the following summaries, the lists of ways to specify values are in order of decreasing precedence.

The ways listed ﬁrst override those listed later.

The commands to list valid values only list the values for which the programs you are running were

conﬁgured. If they were conﬁgured with -enable-targets=all, the commands list most of the

available values, but a few are left out; not all targets can be conﬁgured in at once because some of

them can only be conﬁgured native (on hosts with the same type as the target system).

16.1. Target Selection

A target is an object ﬁle format. A given target may be supported for multiple architectures (Sec-

tion 16.2 Architecture Selection). A target selection may also have variations for different operating

systems or architectures.

The command to list valid target values is objdump -i (the ﬁrst column of output contains the rele-

vant information).

Some sample values are: a.out-hp300bsd, ecoff-littlemips, a.out-sunos-big.

You can also specify a target using a conﬁguration triplet. This is the same sort of name that is passed

to configure to specify a target. When you use a conﬁguration triplet as an argument, it must be fully

canonicalized. You can see the canonical version of a triplet by running the shell script config.sub

which is included with the sources.

Some sample conﬁguration triplets are: m68k-hp-bsd, mips-dec-ultrix, sparc-sun-sunos.

16.1.1. objdumpTarget

Ways to specify:

1. command line option: -b or -target

2. environment variable GNUTARGET

3. deduced from the input ﬁle

16.1.2. objcopyand stripInput Target

Ways to specify:

1. command line options: -I or -input-target, or -F or -target

2. environment variable GNUTARGET

3. deduced from the input ﬁle

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Red Hat ENTERPRISE LINUX 4 - USING BINUTILS Manuale Utente Pagina 65