LLD --save-temps ELF object file output does not set e_flags the same as for the final link

[ilovepi]

While investigating #65090, using --save-temps I was surprised that the e_flags in the lto.o file were not the same as those in the final linked binary. This makes using tools like llvm-objdump hard to use without passing several other flags. I'm not sure if this is related to RISC-V target features or if this is an existing problem that goes beyond RISC-V.

CC: @MaskRay Is this a known issue? Is there a workaround?

[llvmbot]

@llvm/issue-subscribers-lld-elf

[MaskRay]

This isn't an lld/ELF issue. It's the LTO target-abi target-features problem that is tracked elsewhere

#50591
#59350

[MaskRay]

Closing as we have other, more canonical places for discussion, but I'll keep this in mind:)

[frobtech]

The flags are correct in the final link output, so how is it not an lld issue that its -save-temps .lto.o file is not consistent with what winds up in the final link file it produces?