[Development] QStringLiteral is broken(ish) on MSVC (compiler bug?)

Giuseppe D'Angelo giuseppe.dangelo at kdab.com
Mon Mar 18 17:20:54 CET 2019

On 18/03/2019 17:02, Matthew Woehlke wrote:
> On 16/03/2019 12.13, Giuseppe D'Angelo via Development wrote:
>> What I meant is this: during phase 5 and 6, are string literals
>> simply sequences of symbols from a set, or are they already encoded
>> in some encoding? From my reading, it's the former (the execution
>> character set is just this -- a set of symbols), and it's only after
>> phase 6 that those symbols are encoded in sequences of
>> char/char16_t/... values (depending on the string literal prefix).
> I would certainly read 5 as*implying*  that at the conclusion of that
> phase, string literals have a definite encoding.*Not*  applying that
> assumption seems to be how we get the broken MSVC behavior of
> "reinterpreting" a UTF-8 string as CP-1252.

Is there a "not" or a double negation somewhere? The way I am what 
_should_ happen is: at the end of phase 5 / 6, string literals are just 
sequences of symbols from a set. Encoding is still not a thing. After 
phase 7 (\0 appended at the end), then the string gets actually encoded 
as an array of char/char16_t/etc.

The fact that MSVC is not seeing sequences of symbols but encoded 
sequences at the end of phase 5, and then messing things up in phase 6, 
is IMHO the bug.

At the end of this... did anyone submit a bugreport against MSVC? Is it 
worth proposing a clarification against the Standard?

Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
KDAB (France) S.A.S., a KDAB Group company
Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
KDAB - The Qt, C++ and OpenGL Experts

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