On Jan 31, 2012, at 4:58 AM, Marc Glisse wrote: >>>> The docs say that ‘__has_builtin’ & co. are macros. What do they expand >>>> to? >>> >>> 0 or 1. >> >> I understand. To put it another way, how are they defined? > > Compiler magic, like __LINE__ for instance? I am still not sure what you are > asking...
Yes, they are compiler magic. __has_attribute() __has_extension() etc all work the same way as well. > Interestingly enough: > $ cat q.c > __has_builtin > $ clang -E q.c > <segfault> Nice catch, fixed in r149397. Thanks! -Chris
