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Malte UblandClaude Opus 5.5
019fc51e31
The static hello binary grew past the 96 KiB ceiling of the runtime tree-shaking test on Linux hosts that link with GNU ld (99,040 B). CI does not see it: its pinned LLVM ships ld.lld, which the compiler prefers, and hello links to about 65 KB there. The Sandbox gate installs Ubuntu's clang-22 without lld, so it links with GNU ld.dd418b067crossed the ceiling (98,032 -> 98,960 B). Its scr_glibc_math.c defines floor, fmod, frexp and other glibc names as hidden functions so a program can start without libm. With GNU ld that cannot work: ld decides --as-needed before section GC, so the runtime's unreachable code keeps libm needed, and it keeps every regular definition of a name a needed shared library defines, hidden or not. Every executable carried the whole unit (about 2.5 KB of code and unwind data) and still loaded libm. Links without lld now leave the unit out; its functions answer what glibc's do.192ea3247installed scr_gen_tag_reader from a load-time constructor in scr_async.c. A constructor is a link root on every format, so each executable kept scr_gen_tag and, with GNU ld, all of scr_async.c's string literals (about 1.1 KB). The generator runtime now installs the reader when it creates a generator, the only time a reader can be needed. Hello is now 93,928 B with GNU ld and 65,472 B with lld. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>