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<h3 class="section">The GNU Assembler</h3>



   <p><small>GNU</small> <code>as</code> is really a family of assemblers. 

If you use (or have used) the <small>GNU</small> assembler on one architecture, you

should find a fairly similar environment when you use it on another

architecture.  Each version has much in common with the others,

including object file formats, most assembler directives (often called

<dfn>pseudo-ops</dfn>) and assembler syntax.



   <p><code>as</code> is primarily intended to assemble the output of the

<small>GNU</small> C compiler <code>gcc</code> for use by the linker

<code>ld</code>.  Nevertheless, we've tried to make <code>as</code>

assemble correctly everything that other assemblers for the same

machine would assemble. 

Any exceptions are documented explicitly (see <a href="Machine-Dependencies.html#Machine%20Dependencies">Machine Dependencies</a>). 

This doesn't mean <code>as</code> always uses the same syntax as another

assembler for the same architecture; for example, we know of several

incompatible versions of 680x0 assembly language syntax.



   <p>Unlike older assemblers, <code>as</code> is designed to assemble a source

program in one pass of the source file.  This has a subtle impact on the

<kbd>.org</kbd> directive (see <a href="Org.html#Org"><code>.org</code></a>).



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