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2.4. Should I use the GNU assembler, or my vendor's assembler?

This depends on your platform and your decision about the GNU linker. For most platforms, you'll need to use gas if you use the GNU linker. For some platforms, you have no choice; check the gcc installation notes to see whether you must use gas. But you can usually use the vendor's assembler if you don't use the GNU linker.

The GNU assembler assembles faster than many native assemblers; however, on many platforms it cannot support the local debugging format.