Not exactly: the C Standard *allows* ? to be escaped as \?, it does
not specify that it should be.
Hmm .. I stand corrected! OK - so if it sees \? its ? and if it sees ?
it checks to see if its a trigraph, and if it sees \??= then it cries.
Imagine you have a date template that looks like this: “??/??/??”
It looks pretty harmless, but with trigraph conversion, it translates
as “\\??”
As I read this I was thinking .. why would they escape a question mark?
And then
I saw the word trigraphs and thought .. what were trigraphs again? And
then I looked it up and went .. OH YEAH! Not only have I never needed
them, but I don't even understand WHEN I would need them. Apparently,
I will never need them and it doesn't matter. If I haven't used em in
25 years, its not gonna happen.
The good news is tcc does not support trigraphs at all, but try gcc
and clang on this ;-)
That is good news! If it supported them I would hack the code out of
the source to make my copy a little bit smaller.
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