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If __gnu_lto_slim is global, undefined, default visibility in the early debug object, then it finds its way into .dynsym when creating shared libraries. __gnu_lto_slim in a symbol table (.dynsym or .symtab) signals nm and other binutils that the object is an LTO object needing a plugin, but that isn't the case for the ld liblti-17 tests. So, make __gnu_lto_slim hidden to prevent it becoming dynamic. Further, make it weak because some linkers may warn on finding an undefined global non-default visibility symbol. PR lto/82575 * simple-object-elf.c (simple_object_elf_copy_lto_debug_sections): Make discarded non-local symbols weak and hidden. From-SVN: r253914
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