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When `NO_SYMLINK_HEAD` is defined, `create_ref_symlink()` is hard-coded as `(-1)`, and as a consequence the condition `!create_ref_symlink()` always evaluates to false, rendering any code guarded by that condition unreachable. Therefore, clang is _technically_ correct when it complains about unreachable code. It does completely miss the fact that this is okay because on _other_ platforms, where `NO_SYMLINK_HEAD` is not defined, the code isn't unreachable at all. Let's use the same trick as in 82e79c63642c (git-compat-util: add NOT_CONSTANT macro and use it in atfork_prepare(), 2025-03-17) to appease clang while at the same time keeping the `-Wunreachable` flag to potentially find _actually_ unreachable code. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>