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1. GAS versions

GAS has acquired layers of code over time. The original GAS only supported the a.out object file format, with three sections. Support for multiple sections has been added in two different ways.

The preferred approach is to use the version of GAS created when the symbol BFD_ASSEMBLER is defined. The other versions of GAS are documented for historical purposes, and to help anybody who has to debug code written for them.

The type segT is used to represent a section in code which must work with all versions of GAS.

1.1 Original GAS  Original GAS version
1.2 MANY_SEGMENTS gas version  
1.3 BFD_ASSEMBLER gas version  



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