[PATCH] Do not escape a newline after ??/ unless trigraphs are enabled

[Rui Ueyama]

Hi,

I found that Clang always treats character sequence "??/" at the end of a
line comment as a trigraph, even if trigraphs are disabled. As a result, if
??/ is at the end of a line comment, the subsequent newline is escaped, and
the next line become a continuation of the line comment.

Patch attached. Now it warns about a trigraph and does not treat it as a
backslash unless trigraphs are enabled.

Rui
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