Deprecate -traditional-cpp?

[Nathan Sidwell]

Is it time to deprecate traditional preprocessing?  It's been  30 years 
since C89.  Are (non-compiler) tools that use it still things?

Handling it gets its hooks into a bunch of odd places in libcpp.
To be specific: deprecate -traditional-cpp for GCC10, remove in GCC11.

nathan

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Nathan Sidwell