https://bugs.llvm.org/show_bug.cgi?id=43708
Bug ID: 43708
Summary: -Wc++2a-compat erroneously emitted before
preprocessing is complete
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Compile the following with -std=c++17 -Wc++2a-compat -Werror:
#define LPAREN (
#define EXPAND(...) __VA_ARGS__
#define EAT(...)
EAT(requires) // OK, no warning.
EXPAND(EAT LPAREN requires)) // Oops, warning.
This file emits no tokens after full preprocessing; however, the compiler still
complains about the presence of the `requires` keyword on the last line. Note
that `EAT(requires)` compiles without warning, which leads me to believe that
the warning is looking for C++20 keywords after each macro expansion instead of
after full expansion.
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