[cfe-dev] Clang warning for invalid casting!

[Raphael Isemann via cfe-dev]

Oh true, I stand corrected.

- Raphael

2017-07-27 12:44 GMT+02:00 Roman Lebedev <lebedev.ri at gmail.com>:
> On Thu, Jul 27, 2017 at 1:42 PM, Roman Lebedev <lebedev.ri at gmail.com> wrote:
>> On Thu, Jul 27, 2017 at 1:03 PM, Raphael Isemann via cfe-dev
>> <cfe-dev at lists.llvm.org> wrote:
>>> Clang 3.8 gives an error as expected, so the problem is probably in
>>> your setup. See https://godbolt.org/g/Uf6XyX
>> To add to that, it only warns if -m64 is specified, and does not warn
>> if -m32 is specified. Similarly, here on 64-bit machine, it does not warn.
> Edit: also, the original author asked about C, and not C++.
> And if -x c is specified, there is no warning no matter the -m32/-m64
>
>>> - Raphael
>> Roman.
>
>>> 2017-07-27 4:05 GMT+02:00 David John via cfe-dev <cfe-dev at lists.llvm.org>:
>>>> I am trying to compile a simple code (see below) with gcc and clang. the gcc
>>>> generates a warning indicating an incomparable casting (great!). However,
>>>> clang didn't generate any warnings! I have passed the same arguments for
>>>> both:
>>>>
>>>> cc -Wall -Wextra tmp3.c
>>>> gcc -Wall -Wextra tmp3.c
>>>>
>>>> Should I expect clang to generate error or not? If yes, is there an
>>>> additional option needs to be passed to clang compiler to generate a warning
>>>> for something that is obviously wrong?
>>>>
>>>> Code:
>>>>
>>>> int main(void)
>>>> {
>>>>    void *b = (void *)0x12345678;
>>>>    int   a = (int)(unsigned long)b;
>>>>    int   c = (int)b;
>>>>    return a + c;
>>>> }
>>>>
>>>>
>>>> Clang version 3.8
>>>>
>>>>
>>>>
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