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pp_line: do not swallow #line with negative deltas #49

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pp_line: do not swallow #line with negative deltas #49

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6 changes: 5 additions & 1 deletion tccpp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3802,7 +3802,11 @@ static void pp_line(TCCState *s1, BufferedFile *f, int level)

if (s1->Pflag == LINE_MACRO_OUTPUT_FORMAT_NONE) {
;
} else if (level == 0 && f->line_ref && d < 8) {
} else if (level == 0 && f->line_ref && d >= 0 && d < 8) {
/* Negative d (e.g. #line resume after a large synthetic injection)
* must not take the short-newline swallow path: while (d > 0) is a
* no-op then, so the directive was silently dropped and line
* tracking drifted. Restrict the swallow to non-negative deltas. */
while (d > 0)
fputs("\n", s1->ppfp), --d;
} else if (s1->Pflag == LINE_MACRO_OUTPUT_FORMAT_STD) {
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