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vanjacosic / rust-ffi-to-c

A simple tutorial on how to call a C function from Rust 🦀
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I am getting error at step 3, rustc src/main.rs -l multiply.o -L . #3

Open erdikilic opened 10 months ago

erdikilic commented 10 months ago

Hi,

Firstly thanks for the tutorial. I follow the steps but I got this error at step 3. I am so new in rust and c, and could not solve the problems. However, when I run this ar rcs libmultiply.a multiply.o and then rustc -l static=multiply -L . src/main.rs, it works as expected. Are there any options to run without ar rcs?

error: linking with `cc` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/erdi/miniconda3/bin:/home/erdi/miniconda3/condabin:/home/erdi/.cargo/bin:/home/erdi/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin" VSLANG="1033" "cc" "-m64" "/tmp/rustchwXAys/symbols.o" "main.main.b620efc257d42d9c-cgu.0.rcgu.o" "main.52fsdrpxr24z69pc.rcgu.o" "-Wl,--as-needed" "-L" "." "-L" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bdynamic" "-lmultiply.o" "-Wl,-Bstatic" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-6498d8891e016dca.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-3debdee1a9058d84.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-8339c5bd5cbc92bf.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-160ebcebb54c11ba.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-95c75789f1b65e37.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-7e8094f2d6258832.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-bac9783ef1b45db0.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-a1cd87df2f2d8e76.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-7fd06d468d7dba16.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-5ac19487656e05bf.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-c7c35d32cf825c11.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-c523f1571362e70b.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-85f17c92b770a911.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-598d3ba148dadcea.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-a58ec2dab545caa4.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-f9dda8cca149f0fc.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-7ba4c315dd7a3503.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-5ac2993e19124966.rlib" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-df2fb7f50dec519a.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/home/erdi/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "main" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
  = note: /usr/bin/ld: cannot find -lmultiply.o: No such file or directory
          collect2: error: ld returned 1 exit status

error: aborting due to previous error
DanielUMorales commented 9 months ago

Same here image

DanielUMorales commented 9 months ago

How did you know to use ar? I would never have thought of that, thank you very much

coalooball commented 7 months ago

Hello @DanielUMorales, @erdikilic .

I encountered the same error, and my solution was to use a archive file instead of the object file.

clang src/multiply.c -c

ar rcs libmultiply.a multiply.o

rustc src/main.rs -l multiply -L .

./main
[Rust] Hello from Rust! 🦀
[Rust] Calling function in C..
[C] Hello from C!
[C] Input a is: 5000 
[C] Input b is: 5 
[C] Multiplying and returning result to Rust..
[Rust] Result: 25000