[cfe-dev] __has_attribute in system headers

Jonathan Sauer jonathan.sauer at gmx.de
Sat Feb 25 12:19:02 PST 2012

>> I got hit by this issue too. 
>> I tried to declare a cxx_noreturn macros (which is perfectly legal AFAIK), but it conflicted with clang  __has_feature() .
>> Having an alternate syntax for __has_xxx() special functions, or disabling macro evaluation in such context, would be really useful.
> GCC's attributes have an '__attribute__' form to avoid this case (as identifiers beginning with '__' are reserved for the
> system and the compiler). Maybe clang should follow this example.

For those not reading cfe-commits: It now (r151445) does (cf. clang's language extension manual at


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