From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Fri, 10 Jul 2026 08:37:39 +0000 (+0900)
Subject: Optimize dlopen ELF notes via anchoring and explicitly embed them into executables... 
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5403bd48fc8a399ccf09859a59d86cc8a864a395;p=thirdparty%2Fsystemd.git

Optimize dlopen ELF notes via anchoring and explicitly embed them into executables (#42908)

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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5403bd48fc8a399ccf09859a59d86cc8a864a395