Building C static Library for UEFI

["Ayush Singh" <ayushdevel1325@gmail.com>]

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Hello everyone. There are some tests in Rust std that statically link to 
a C static library to check ffi. Since if Rust is ever used in edk2, it 
would probably have to integrate with the existing C code. Thus, I 
thought rather than ignoring these tests, I wanted to make them work.

What Rust cargo needs is a static C library (`.lib`) to link against. I 
was not really able to find much about linking in UEFI applications. 
However, from what I understand [1], edk2 already does do static link 
for C modules, so it should technically be the same for Rust as well as 
long as a static library can be generated from C code. I did look at the 
`build_rules` [2], but I don't know where the flags are defined. I think 
following rules: `C-Code-File` -> `Object-File` should technically 
create a static library, but would it work with projects outside edk2? 
Also, it would be great if someone can also help me with the flags that 
need to be supplied if it can.


Yours Sincerely

Ayush Singh


[1]: 
https://edk2-docs.gitbook.io/edk-ii-build-specification/9_build_or_make_stage/95_dynamic_link

[2]: 
https://github.com/tianocore/edk2/blob/e9150618ec91f79e70a1719ac8c198bee34a99be/BaseTools/Conf/build_rule.template

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