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[flang] Fix prescanner bug w/ empty macros in line continuation #141274

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Merged
merged 1 commit into from
May 28, 2025
Merged

[flang] Fix prescanner bug w/ empty macros in line continuation #141274

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2 changes: 1 addition & 1 deletion flang/lib/Parser/prescan.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1473,7 +1473,7 @@ const char *Prescanner::FreeFormContinuationLine(bool ampersand) {
GetProvenanceRange(p, p + 1),
"Character literal continuation line should have been preceded by '&'"_port_en_US);
}
} else if (p > lineStart) {
} else if (p > lineStart && IsSpaceOrTab(p - 1)) {
--p;
} else {
insertASpace_ = true;
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6 changes: 6 additions & 0 deletions flang/test/Preprocessing/bug890.F90
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
! RUN: %flang -E %s 2>&1 | FileCheck %s
!CHECK: subroutine sub()
#define empty
subroutine sub ( &
empty)
end