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preproc: don't unmacro if macro cannot be found. #10

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5 changes: 5 additions & 0 deletions asm/preproc.c
Original file line number Diff line number Diff line change
Expand Up @@ -4330,6 +4330,11 @@ static int do_directive(Token *tline, Token **output)
goto done;
}
mmac_p = (MMacro **) hash_findi(&mmacros, spec.name, NULL);
if (mmac_p == NULL) {
// If the macro cannot be found, there's nothing to do.
free_tlist(spec.dlist);
break;
}

/* Check the macro to be undefined is not being expanded */
list_for_each(l, istk->expansion) {
Expand Down