C preprocessor: VA_ARGS variadic macros

• Type: feature (cpreproc). Track C.
• Found: 2026-07-06 c-testsuite run.

Failing tests

• 00083: #define CALL(FUN, ...) FUN(__VA_ARGS__) — exit 2
• 00084: #define ARGS(...) __VA_ARGS__ — exit 2

Exit 2 not compile error → macro expands to SOMETHING but drops/garbles the variadic tail (second check in each test fails).

Fix site

compiler/cpreproc.inc macro parameter collection + expansion: ... parameter, __VA_ARGS__ substitution (comma-joined rest args, empty allowed).

Gate

Drop 00083.c/00084.c from test/c-conformance/pxx.skip; runner green.

Log

• 2026-07-06 — resolved, commit d26fd5da.