18.1 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