[cfe-dev] magic __has_feature macro
clattner at apple.com
Fri Jun 12 18:03:07 PDT 2009
As Clang "grows up", it will continue to get more features. I'd like
to add new "__has_feature" builtin function-like macro that evaluates
to 0 or 1 if clang has a specified feature. This would allow us to
have something like this:
#if defined(__has_feature) && __has_feature(whatever)
... where "whatever" is an identifier. The list of accepted
identifiers would be listed in the extensions manual.
I want to add this, because I really hate the proliferation of random
predefines macros that the preprocessor ends up accreting. Does
anyone have any objection to this?
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