Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/cc-cpp-c99-comm/readme

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When running "?c -p ...", ensure the backend cpp recognizes C++ comments.

2c(1) states that the compilers recognize // comments, and the bare compilers
do.  But if you invoke the compiler with '-p', the backend cpp process
doesn't handle // comments properly unless you also give ?c the undocumented
'-+' option (which it passes through to cpp).

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