[cfe-dev] clang comparison webpage

[Mouse]

http://clang.llvm.org/comparison.html compares clang versus three other
compilers, one of them gcc, and invites mail to cfe-dev "if you think
some characterization is unfair here".

But the comparison to gcc leaves off the major reason clang is a
complete nonstarter for me: lack of support for gcc extensions.  (In my
case nested function support is the biggest one; clang appears to be
under the impression that they are "infrequently used", which, true or
not in general, is not true of my code.)

Not that it's a screaming big deal.  But I do think it's at least
somewhat unfair to gcc to fail to at least mention clang's lack of
support for some of gcc's extensions when comparing the two.

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