Node:Target Selection, Next:, Up:Selecting The Target System


Target Selection

A target is an object file format. A given target may be supported for multiple architectures (see 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 Options)
  2. script command TARGET (see Format Commands)
  3. environment variable GNUTARGET (see Environment)
  4. the default target of the selected linker emulation (see Linker Emulation Selection)

Linker Output Target

Ways to specify:

  1. command line option: -oformat (see Options)
  2. script command OUTPUT_FORMAT (see Format Commands)
  3. the linker input target (see "Linker Input Target" above)