Non hashable args like fdebug-prefix-map & related #2409
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Hello!
I realized that compilers arguments/flags for gcc like the mentioned above are being used in the hash_key function. This means that strategies for handling the absolute paths to relatives regarding debug info or in similar fashion that involves passing a dynamic value into the argument depending of the builder origin will create a different hash key.
From my point of view, these kind of arguments should not affect the computer hash key at all:
A naive change could just include a non-hashable list of args that should be skipped or not considered into the hash key.