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9.13.2 x86 specific Directives

.lcomm symbol , length[, alignment]
Reserve length (an absolute expression) bytes for a local common denoted by symbol. The section and value of symbol are those of the new local common. The addresses are allocated in the bss section, so that at run-time the bytes start off zeroed. Since symbol is not declared global, it is normally not visible to ld. The optional third parameter, alignment, specifies the desired alignment of the symbol in the bss section.

This directive is only available for COFF based x86 targets.