https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109877
Bug ID: 109877 Summary: Support for clang-style attributes is needed to parse Darwin SDK headers properly Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: iains at gcc dot gnu.org Target Milestone: --- clang has GNU-style attribute support, but with essentially per-attribute parsing of the attribute argument list. This extends to, for example: __attribute__((availability(macOS, introduced=12.3.4))) and: __attribute__((availability(macOS, message="partial string" "more string"))) These are examples that GCC rejects; The issue actually need addressing during lexing since the first is an invalid token for a number (it's intended to represent a version) and we reject it before the parser has a chance to treat it specially. Ergo, we need a way to escape clang-specific attributes so that we can parse them.