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When is the bloom filter in .gnu.hash used in an ELF file?

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The .gnu.hash. section in elf binaries contain a bloom filter for dynamic symbol lookup. However, when I create simple binaries the bloom filter seems to be unused and empty.

Why is there no bloom filter?Does the compiler only add them after a specific threshold of symbols that need a lookup?How does the symbol lookup happen if the bloom filter is not used?

Edit: There is no .hash section either that could act as a fallback.


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