[Bug ld/29823] ld riscv: undefined elf_backend_obj_attrs_handle_unknown causes segfault when merging .riscv.attributes

[nelsonc1225 at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=29823

Nelson Chu <nelsonc1225 at sourceware dot org> changed:

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                 CC|                            |nelsonc1225 at sourceware dot 
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--- Comment #3 from Nelson Chu <nelsonc1225 at sourceware dot org> ---
There may be a TODO that handle vendor elf attributes,

According to the psabi, the vendor attribute number is from 32768, so need to
use elf_other_obj_attributes_proc rather than elf_known_obj_attributes_proc to
access, and may need to handle the merge rules in the
riscv_elf_obj_attrs_handle_unknown.  I had tried the similar support in the
pr31179, even that we choose another way to fix problem there, maybe the
proposed patch will help to support vendor attributes.

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