Luca Boccassi
56a7febca7
If the SD_ELF_NOTE_DLOPEN macro gets used twice in the same binary, with identical content, it will add two identical notes, which is wasteful and confusing. Emit each note into a COMDAT group keyed on its JSON payload, with an assembler .ifndef guard, so byte-identical notes fold to a single copy within a translation unit (assembler) and across translation units (linker). The section is marked SHF_GNU_RETAIN so --gc-sections keeps it, and uses the portable "%note" section type so it also assembles on architectures where "@" is the comment character (e.g. 32-bit ARM). This ensures SD_ELF_NOTE_DLOPEN can be used as many times as needed, and the result will be automatically deduplicated. The SHF_GNU_RETAIN (R) flag requires binutils >= 2.36, which cuts off CentOS 9. To avoid breaking builds, override the flags passed to the linker to skip that flag. This unfortunately means in many cases the ELF notes section will be dropped by the linker due to --gc-sections. For CentOS 9 builds, the choice is thus between not using --gc-sections and losing dlopen ELF notes, and the latter is made here given it's less impactful. Co-developed-by: Claude Opus 4.8 <noreply@anthropic.com>
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