[Bug preprocessor/49928] Only workaround for "-Wundef" is "defined(Macro) && Macro", but it is undefined behavior?

[egall at gwmail dot gwu.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=49928

Eric Gallager <egall at gwmail dot gwu.edu> changed:

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                 CC|                            |egall at gwmail dot gwu.edu

--- Comment #2 from Eric Gallager <egall at gwmail dot gwu.edu> ---
-Wexpansion-to-defined now exists and should warn about this