[Patch] libstdc++/29989

[Gabriel Dos Reis]

Paolo Carlini <pcarlini@suse.de> writes:

| Doug Gregor wrote:
| 
| > <windows.h> is known to #define min and max as macros.
| 
| Interesting, thanks. Then, what do you suggest? Should we undef min
| and max elsewhere too? The PR was about <limits>, which, at some point
| in the far past also had undefs, not anymore...

At some point, I thought c++config was supposed to do that; but
apparently it does not.

-- Gaby