[PATCH] [PATCH] PR9804 - __is_signed conflicts with libstdc++

[Richard Smith]

On Tue, Apr 21, 2015 at 12:28 PM, Charlie Turner <charlesturner7c5 at gmail.com
> wrote:

> Hi Richard, thanks for taking a look.
>
> The motivation is that I have code that looks a bit like,
>
> ------------------8<--------------------------
> typedef bool BOOL;
>
> class Foo {
>     static const BOOL __is_signed;
>

__is_signed is a reserved identifier, so your code is ill-formed (no
diagnostic required). The existing compatibility hack exists to work around
an issue with libstdc++, which (being part of the implementation) is
permitted to use names like this, not to support user code doing this sort
of thing.


>   };
>
> #include <map>
>
> int main() {}
> ------------------>8--------------------------
>
> and that Clang fails to compile it,
>
> test.c:4:23: error: expected member name or ';' after declaration
> specifiers
>     static const BOOL __is_signed;
>     ~~~~~~~~~~~~~~~~~ ^
>
> - Charlie.
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