[Info-vax] New VSI post on Youtube

[Arne Vajhøj]

On 8/14/2024 8:07 PM, Lawrence D'Oliveiro wrote:
> On Wed, 14 Aug 2024 19:58:30 -0400, Arne Vajhøj wrote:
>> I am saying that:
>>
>> default sizeof long C++ x64 <> default sizeof long C++ Itanium & Alpha
>> default sizeof pointer C++ x64 <> default sizeof pointer C++ Itanium &
>> Alpha
>>
>> and later:
>>
>> default sizeof long C++ x64 <> default sizeof long C x64
> 
> This is why you have stdint.h.

Yes.

But short/int/long/long long are unfortunately very common in C/C++
code probably an order of magnitude larger than
int8_t/int16_t/int32_t/int64_t.

>> default sizeof pointer C++ x64 <> default sizeof pointer C x64
> 
> Interesting ... is C++ always supposed to be ABI-compatible with C?

I don't think there is any guarantee for such compatibility. Two
different compilers are free to behave differently.

But they were compatible on Alpha and Itanium.

And I think C++ and C compilers of same origin are usually compatible
on other platforms as well.

It is practical. C++ code calling C code is quite common.

Arne