GNU Assembler

The GNU Assembler, commonly known as gas or as, is the assembler developed by the GNU Project. It is the default final pass of GCC, generating machine code from the assembly-language output of the code generator. It is used to assemble the assembly-language portions of the GNU operating system and the Linux kernel, and various other software. It is a part of the GNU Binutils package.

The GAS executable is named as, the standard name for a Unix assembler. GAS is cross-platform, and both runs on and assembles for a number of different computer architectures. GAS is free software released under the GNU General Public License v3.