Prazek added a comment.
In http://reviews.llvm.org/D19105#422702, @Quuxplusone wrote:
> It seems like this proposed diagnostic and fixit, statistically speaking, is
> *never* correct.
> In the cases where there is a code issue to be corrected, the diagnosable
> issue really seems to involve dataflow analysis:
>
> "Here is a variable of integral type (not bool), which over its lifetime
> assumes only the values `0` and `1`. This variable should be declared as type
> `bool`."
> "Here is a function returning integral type (not bool), which returns only
> the values `0` and `1`. This function should be declared as returning type
> `bool`."
> "Here is a parameter of integral type (not bool), which (via whole-program
> analysis) assumes only the values `0` and `1`. This parameter should be
> declared as type `bool`."
You are right, if someone is using true/false, then he probably mean it, and he
is just assigning it to wrong type. But I don't see a point spending too much
time to write something that would be smart enough to fix most of the issues as
we would like. I think having this fixit is good for now and I would leave it
like this.
From my usage, I like when clang-tidy touch some files and changes it somewhow,
so it is much simpler to check it in git than to look at the warnings.
================
Comment at: lib/Driver/Tools.cpp:2022
@@ -2021,3 +2021,3 @@
- if (OptionIter->second == true) {
+ if (OptionIter->second == 1) {
// Duplicate option specified.
----------------
Quuxplusone wrote:
> Shouldn't the original code already have triggered some warning about
> explicit comparison with a boolean value?
>
> if (OptionIter->second) {
>
> doesn't have literally the same semantics, but it's clearly IMHO what was
> intended.
> Also, if `decltype(llvm::StringMap<bool>::iterator{}->second)` is not `bool`,
> something weird is going on.
te misc-simplify-boolean-expression is to solve this problem. I will check if
this code make sense.
http://reviews.llvm.org/D19105
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