[cfe-dev] Missing -Wshorten-64-to-32 for operator+=

[Milan Kříž via cfe-dev]

Hi,

I have found that operator+= doesn't fire -Wshorten-64-to-32 warning, while pure opreator+ fires it. See the 
following example:

#include <stdint.h>

int main()
{
     uint32_t test = 0;
     uint64_t test64 = UINT32_MAX + 1;
     test += test64;// doesn't fire the warning
     test = test + test64; // fires the warning: implicit conversion loses integer precision: 'unsigned long' to 
'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
}

I've found this in 32-bit build while adding uint64_t to size_t (size_t has 4 byte on 32-bit) variable (Clang 
didn't warn me while MSVC surprisingly did :-)).

Should I post a bug-report or is it some known exception where the warning should not occur?

Mi-L@


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