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| author | Jeff King <peff@peff.net> | 2016-11-08 22:57:28 -0500 |
|---|---|---|
| committer | Jeff King <peff@peff.net> | 2016-11-08 22:59:24 -0500 |
| commit | 2ae38f2a65abae910ff7ad62861414d4333d01fc (patch) | |
| tree | 23da3c77d27543b677424a4336e07b413c94a8e1 | |
| parent | 791eb8708f7a98c9f3924b1810c20a9c7dd4c767 (diff) | |
| download | git-2ae38f2a65abae910ff7ad62861414d4333d01fc.tar.gz | |
sequencer: silence -Wtautological-constant-out-of-range-compare
When clang compiles sequencer.c, it complains:
sequencer.c:632:14: warning: comparison of constant 2 with
expression of type 'const enum todo_command' is always
true [-Wtautological-constant-out-of-range-compare]
if (command < ARRAY_SIZE(todo_command_strings))
This is because "command" is an enum that may only have two
values (0 and 1) and the array in question has two elements.
As it turns out, clang is actually wrong here, at least
according to its own bug tracker:
https://llvm.org/bugs/show_bug.cgi?id=16154
But it's still worth working around this, as the warning is
present with -Wall, meaning we fail compilation with "make
DEVELOPER=1".
Casting the enum to size_t sufficiently unconfuses clang. As
a bonus, it also catches any possible out-of-bounds access
if the enum takes on a negative value (which shouldn't
happen either, but again, this is a defensive check).
Signed-off-by: Jeff King <peff@peff.net>
| -rw-r--r-- | sequencer.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sequencer.c b/sequencer.c index a61fe76f98..fae2bbd2ba 100644 --- a/sequencer.c +++ b/sequencer.c @@ -629,7 +629,7 @@ static const char *todo_command_strings[] = { static const char *command_to_string(const enum todo_command command) { - if (command < ARRAY_SIZE(todo_command_strings)) + if ((size_t)command < ARRAY_SIZE(todo_command_strings)) return todo_command_strings[command]; die("Unknown command: %d", command); } |