Yu Watanabe
5403bd48fc
This PR optimizes the handling of `dlopen` ELF notes and reduces binary footprints across the tree. By enabling compiler section-splitting (`-ffunction-sections`/`-fdata-sections`), the linker can now accurately garbage-collect unused code and data. To align with this, `SD_ELF_NOTE_DLOPEN_ANCHORED()` macro is introduced, which ties `dlopen` notes to their calling functions so that unused notes are automatically removed by `--gc-sections`. Additionally, this explicitly embeds required `dlopen` notes into individual executables to fix a visibility issue where package managers missed runtime dependencies invoked indirectly through `libsystemd-shared.so`.
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