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`EXTERN` is a modern (MASM 6, 1991) alternative to MASM 5 `EXTRN` directive. https://learn.microsoft.com/en-us/cpp/assembler/masm/extrn?view=msvc-180 > `EXTRN` is an older directive that is a synonym for `EXTERN`. It > provides compatibility with old source files. You should always use > the `EXTERN` directive in new source code. From "The Art of Assembly Language Programming", Randall Hyde, 1996
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EXTERNis a modern (MASM 6, 1991) alternative to MASM 5 (1987)EXTRNdirective.In C++, C, and Assembler, see
EXTRNandEXTERN.See also from The Art of Assembly Language Programming, Randall Hyde, 1996:
This patch is a requirement to make OCaml count as new source code and be ready for a next century of MASM hacking.
(this patch is cosmetic, no incidence on produced code). No change entry needed.