Add a die(...) to a default case for the switch statement selecting
between grep pattern types under --recurse-submodules.
Normally this would be caught by -Wswitch, but the grep_pattern_type
type is converted to int by going through parse_options(). Changing
the argument type passed to compile_submodule_options() won't work,
the value will just get coerced.
Thus catching this at runtime is the least worst option. This won't
ever trigger in practice, but if a new pattern type were to be added
this catches an otherwise silent bug during development.
See commit 0281e487fd ("grep: optionally recurse into submodules",
2016-12-16) for the initial addition of this code.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
builtin/grep.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/builtin/grep.c b/builtin/grep.c
index 3ffb5b4e81..1c0adb30f3 100644
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -495,6 +495,12 @@ static void compile_submodule_options(const struct grep_opt *opt,
break;
case GREP_PATTERN_TYPE_UNSPECIFIED:
break;
+ default:
+ /*
+ * -Wswitch doesn't catch this due to casting &
+ * -Wswitch-default is too noisy.
+ */
+ die("BUG: Added a new grep pattern type without updating switch statement");
}
for (pattern = opt->pattern_list; pattern != NULL;
--
2.11.0