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FOREACH_ARG() hands the position of each argument as the expression "count - N", which can be used as a value but cannot be pasted into an identifier, because "##" pastes a single token. Hand it out as a literal instead, so that an action macro can build a symbol name out of it, which is what a subsystem needs when the link order of its objects has to follow the declaration order. The list is reversed through REVERSE_ARG() so that the position becomes the level of the chain, and each step emits the recursion before its own action so that the actions still come out in the order the arguments were given. This is how the same problem is solved upstream in Zephyr, whose FOR_EACH_IDX() also reverses the list before walking a per arity chain. The index values are unchanged, so the arithmetic use keeps working: NOTE_PRINTF_TYPES(), the only user in tree, produces the same tags for every argument count. It now supplies the leading zero itself, because FOREACH_ARG() no longer expands to "0" when the list is empty. An empty list expanding to nothing is what lets an action expanding to declarations be used at file scope. Assisted-by: Claude Code Signed-off-by: Jorge Guzman <jorge.gzm@gmail.com> |
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