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A bare -DMMU_IRAM_SIZE would preprocess to len = 1 and fail far away in ld (or as a misleading testing-mode message), so MMU_CUSTOM requires a body on both segment sizes before the shape check. -fuse-ld=/-specs=/ --specs= are driver options with no -Wl, spelling, so they get their own rejection instead of advice that would make things worse. An unremovable stale stderr note now warns with the clean hint, since its consequence is a permanently unstamped cache.