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tokens is a required parameter on _flag_defines and _project_flags now, so the per-consumer re-lex the shared lexer was meant to end cannot come back. The cache stamp covers the gcc binary's size and mtime via a shared _stat_sig (an in-place toolchain re-extraction regenerates the script like a header edit). A bare -I or -D from an empty argument is warned and skipped instead of letting gcc eat the next flag. _defines_flags documents that its tokens carry shell-level escaping and must be emitted unquoted, and _MMU_DEFAULT notes why the board-manifest values are hardcoded.