GNU Binary Utilities: Target Selection

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## 15.1 Target Selection

A target is an object file format. A given target may be supported for multiple architectures (see section 15.2 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 relevant 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'`.

### `objdump` Target

Ways to specify:

1. command line option: ``-b'` or ``--target'`

2. environment variable `GNUTARGET`

3. deduced from the input file

### `objcopy` and `strip` Input 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

### `objcopy` and `strip` Output Target

Ways to specify:

1. command line options: ``-O'` or ``--output-target'`, or ``-F'` or ``--target'`

2. the input target (see "`objcopy` and `strip` Input Target" above)

3. environment variable `GNUTARGET`

4. deduced from the input file

### `nm`, `size`, and `strings` Target

Ways to specify:

1. command line option: ``--target'`

2. environment variable `GNUTARGET`

3. deduced from the input file

### Linker Input Target

Ways to specify:

1. command line option: ``-b'` or ``--format'` (see section `Options' in Using LD)

2. script command `TARGET` (see section `Format Commands' in Using LD)

3. environment variable `GNUTARGET` (see section `Environment' in Using LD)

4. the default target of the selected linker emulation (see section 15.3 Linker emulation selection)

### Linker Output Target

Ways to specify:

1. command line option: ``-oformat'` (see section `Options' in Using LD)

2. script command `OUTPUT_FORMAT` (see section `Format Commands' in Using LD)

3. the linker input target (see "Linker Input Target" above)

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