as: Sparc-Aligned-Data
9.43.2 Enforcing aligned data
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SPARC GAS normally permits data to be misaligned. For example, it
permits the '.long' pseudo-op to be used on a byte boundary. However,
the native SunOS assemblers issue an error when they see misaligned
data.
You can use the '--enforce-aligned-data' option to make SPARC GAS
also issue an error about misaligned data, just as the SunOS assemblers
do.
The '--enforce-aligned-data' option is not the default because gcc
issues misaligned data pseudo-ops when it initializes certain packed
data structures (structures defined using the 'packed' attribute). You
may have to assemble with GAS in order to initialize packed data
structures in your own code.