[patch] libstdc++/65630 add exports for operator+() with std::__cxx11::basic_string

[Jonathan Wakely]

On 30/03/15 18:59 +0100, Jonathan Wakely wrote:
>In the library we instantiate these functions:
>
> template S operator+(const C*, const S&);
> template S operator+(C, const S&);
> template S operator+(const S&, const S&);

Hmm, that's a bit cryptic, sorry :-)

It would have been useful to explain that we then compile that chunk
four times with the following definitions:

  #define C char
  #define S std::basic_string<C>

  #define C wchar_t
  #define S std::basic_string<C>

  #define C char
  #define S std::__cxx11::basic_string<C>

  #define C wchar_t
  #define S std::__cxx11::basic_string<C>

The problem was that the instantiations generated by the third and
fourth cases were not exported from the shared library.

I've attached the patch I'm planning for stage 1.

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