I am not sure why ## was used in this macro, as w/o the string concatenation the tokens are legal ANSI-C.  Maybe to enable 'op' to be a macro itself? Anyway, with the ## concatenation Gcc 3.1's integrated `cpp' treats "=op(" as a single token vs. the three tokens it is.
I am not sure why ## was used in this macro, as w/o the string concatenation
the tokens are legal ANSI-C.  Maybe to enable 'op' to be a macro itself?
Anyway, with the ## concatenation Gcc 3.1's integrated `cpp' treats "=op("
as a single token vs. the three tokens it is.

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