https://bugs.llvm.org/show_bug.cgi?id=48462
Bug ID: 48462
Summary: Macro expansion not performed on argument to
__has_cpp_attribute
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: ndkrem...@gmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
C++20 specifies that the pp-tokens given to __has_cpp_attribute are subject to
macro expansion (http://eel.is/c++draft/cpp.cond#5). GCC performs macro
expansion here, but clang does not. For example (compiled with -std=c++20):
#define X noreturn
#if !__has_cpp_attribute(X)
#error FAIL
#endif
(https://gcc.godbolt.org/z/jWG586)
The above program hits the error case, whereas using "noreturn" directly
instead of "X" does not.
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