Follow-up Comment #1, bug #52335 (project groff):
Hi Bjarni,
I believe fall-through is the correct behavior for groff.cpp, line 295.
However, I don't have GCC 7 handy. Can you test the following patch, please?
diff --git a/src/roff/groff/groff.cpp b/src/roff/groff/groff.cpp
index 46cbf018..ef654f6d 100644
--- a/src/roff/groff/groff.cpp
+++ b/src/roff/groff/groff.cpp
@@ -293,6 +293,7 @@ int main(int argc, char **argv)
break;
case 'o':
oflag = 1;
+ __attribute__ ((fallthrough));
case 'f':
case 'm':
case 'r':
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