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.
commdirective except that the data is placed into the .lbss section instead of the .bss section Comm .
The directive is intended to be used for data which requires a large amount of space, and it is only available for ELF based x86_64 targets.