Changes in C++ FE regarding pedwarns to be errors are harmful

[Andreas Schwab]

Ismail Dönmez <ismail@pardus.org.tr> writes:

> That was just an example, real life testcase shows that problem stems from 
> autoconf and its config.h. Projects end up defining things like HAVE_STDLIB_H 
> twice which is not harmful at all but now causes an error if g++ is used.

Redefinitions with the same replacement list are not an error.

Andreas.

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Andreas Schwab, SuSE Labs, schwab@suse.de
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