[cfe-dev] Clang warning for invalid casting!

[Roman Lebedev via cfe-dev]

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.

> - 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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