SeanLyons[m]: > <@seanmlyons22:matrix.org> I am trying to link a c static library into my rust program. Does anyone know if there is any requirements of the library for `rust-lld` to find it? I am quite sure that I have the right `-L` and `-l` options. I am calling rustc directly to strip out any potential issues with cargo or build.rs.
> 
> This is the command (note that I have also tried with `-L` and `-l`:
> 
> ```
> rustc --crate-name cc13x2_cc26x2_flash --edition=2021 src/main.rs  --crate-type bin --emit=dep-info,link -C opt-level=3 -C embed-bitcode=no -C codegen-units=1 -C debuginfo=2 -C debug-assertions=on -C metadata=1ab2fc47a140afb5 -C extra-filename=-1ab2fc47a140afb5 --out-dir /Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/deps --target thumbv7em-none-eabi -L dependency=/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/deps -L dependency=/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/debug/deps --extern cortex_m=/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/deps/libcortex_m-8a38242e065cd52d.rlib --extern flash_algorithm=/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/deps/libflash_algorithm-c1ddc23f2f09f032.rlib --extern libc=/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/deps/liblibc-492e23184cbd9914.rlib --extern rtt_target=/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/deps/librtt_target-0ea74ddb0a3e4deb.rlib -C link-arg=--nmagic -C link-arg=-Tlink.x -C link-arg=-Tmemory.x -C inline-threshold=5 -C no-vectorize-loops -C force-frame-pointers=no -l "/Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/lib/driverlib.a" -L /Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/build/cortex-m-3b797ecef263c29e/out -L /Users/seanlyons/dev/rust/cc13x2-cc26x2-flash/target/thumbv7em-none-eabi/debug/build/flash-algorithm-b2e1a7e29afecc9c/out
> ```
> 
> Things I tried:
> 
> 1. invoking `file` on the library says "current ar archive"
> 2. Running `arm-none-eabi-readelf -h lib/driverlib.a` gives the following:
> 
> ```
> File: lib/driverlib.a(pwr_ctrl.o)
> ELF Header:
>   Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00 
>   Class:                             ELF32
>   Data:                              2's complement, little endian
>   Version:                           1 (current)
>   OS/ABI:                            UNIX - System V
>   ABI Version:                       0
>   Type:                              REL (Relocatable file)
>   Machine:                           ARM
>   Version:                           0x1
>   Entry point address:               0x0
>   Start of program headers:          0 (bytes into file)
>   Start of section headers:          2632 (bytes into file)
>   Flags:                             0x5000000, Version5 EABI
>   Size of this header:               52 (bytes)
>   Size of program headers:           0 (bytes)
>   Number of program headers:         0
>   Size of section headers:           40 (bytes)
>   Number of section headers:         24
> ```

Your readelf says the OS/ABI is Unix. Is that right?