#intel syntax

Pass the -M intel cli argument, or use .intel_syntax noprefix and switch back to AT&T with .att_syntax prefix.

#macro varargs

GAS supports varidic macro arguments, which is quite useful.

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.macro array head, tail:vararg
    .8byte \head
    
    .ifnb \tail
        array \tail
    .endif
.endmacro

#warnings about defining data

.long, .int, and .word should be typically avoided because their size changes depending on the architecture. Prefer to use .byte, .2byte, .4byte, and .8byte.