patchelf complaining about missing .dynamic section

[mazunki]

During the fixupPhase, we can see that patchelf complains that it's not finding a dynamic section:

Running phase: fixupPhase
shrinking RPATHs of ELF executables and libraries in /nix/store/jaw6zd4z8fdh98i029dmv59lsx27nxc2-includeos_example-static-x86_64-unknown-linux-musl-dev
shrinking /nix/store/jaw6zd4z8fdh98i029dmv59lsx27nxc2-includeos_example-static-x86_64-unknown-linux-musl-dev/net_slaac.elf.bin
patchelf: cannot find section '.dynamic'. The input file is most likely statically linked

Our builds are always statically built, this is correct.

The fix for this is most likely just enabling a flag to inform patchelf that its input is a static file. I assume this is not harmful in anyway, but it'd be nice to get rid of the warning.

[mazunki]

In some cases, this is also followed by the following:

patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type

Could this be related to the triple mentioned in #2335 ?

[mazunki]

dynamic section source: https://github.com/NixOS/patchelf/blob/b49de1b3384e7928bf0df9a889fe5a4e7b3fbddf/src/patchelf.cc#L591

[mazunki]

The reason we get the "Wrong ELF type" message is because our binaries are neither executable nor dynamic. I think we should set the header to be executable. Why is it not?

Looks executable from file result/*.elf.bin: result/net_dns.elf.bin: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped

See: https://github.com/NixOS/patchelf/blob/b49de1b3384e7928bf0df9a889fe5a4e7b3fbddf/src/patchelf.cc#L282