[Bug]: Running cargo test/build fails with 'linking with cc failed'

[0xNeshi]

EDIT: this seems to be an issue with stylus-hello-world. Closing this issue, and opening it in that repo.

Repro steps:

• run the following script:

cargo stylus new tempproj && cd tempproj
rustup toolchain install 1.80 # in case it's not already installed
rustup target add wasm32-unknown-unknown
cargo update # resolves some weird "type annotations needed for `Box<_>`" error

• open src/lib.rs, and at the end of the file add:

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}

• run cargo test --lib

Error log:
```bash
error: linking with `cc` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/nenad/.nvm/versions/node/v22.12.0/bin:/home/nenad/.local/share/pnpm:/home/nenad/.asdf/shims:/home/nenad/.asdf/bin:/home/nenad/.starkli/bin:/home/nenad/.cargo/bin:/home/nenad/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/snap/bin:/home/nenad/.foundry/bin:/home/nenad/.local/bin:/home/nenad/.local/bin" VSLANG="1033" "cc" "-m64" "/tmp/rustcXrS4KN/symbols.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.0a4738f2g99ere2ypmq4m1nrk.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.22wox5v7e9c8e466e9hejwqa1.rcgu.o" 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"/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.bz0g4rzw0xnqcwsh5p75p615u.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.cv4846bhf4aedxn6mebu3w68f.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.damt1o68vxnxt572m0h2ev7te.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.ewtivwxbm7rwyuag1zehemyrs.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.ex699cetzyoe5yedver7r2tm6.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.f2ben15evq9dztg81khkz5kfo.rcgu.o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a.0iz66e2akqfs7swn9oo9fy4hm.rcgu.o" "-Wl,--as-needed" "-L" "/home/nenad/repos/tempproj/target/debug/deps" "-L" "/home/nenad/repos/tempproj/target/debug/build/ring-46fa3655fc8a512f/out" "-L" 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"/home/nenad/repos/tempproj/target/debug/deps/liballoy_sol_types-05ce77bdab7acb94.rlib" "/home/nenad/repos/tempproj/target/debug/deps/liballoy_primitives-0565d776c7590d35.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libitoa-42af64bdede19cfe.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libhex_literal-83a66bba401d9ee3.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libbytes-78702b9fbbc2f3b1.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libserde-5038efda9de1e01f.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libconst_hex-2fe5baf2ace47b66.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libhex-17de966a983efd22.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libcpufeatures-3176e9805aaaa4fc.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libcfg_if-f93ad0443750a3ea.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libruint-f4263af1b8f65a04.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libtiny_keccak-33225fd9e44ef21d.rlib" "/home/nenad/repos/tempproj/target/debug/deps/libcrunchy-9c51c2066d1ef88c.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-0fbbe72b9e0d57dc.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-4cbc28d57c85be7b.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-d583e13b4b2d89a2.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-5d2a1bfb1589ab43.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-dcf90797fbd00d23.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-3b6828d7a1725131.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-f75bdd612dd19f44.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-130d6997e9e34e6a.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-c9c9da5b4611a660.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-0f5b4153173c663b.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-877178c8f84ba478.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler-3907ca7c36d3c032.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-e8b263070ac20a8a.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-d1969118c6f0c13e.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-d48855f89c749535.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-9a1cbc1305da137e.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-d290b706bbcc90ac.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-fd707bd9d5d3d672.rlib" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-d4ebcca572002f93.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/home/nenad/.rustup/toolchains/1.80.0-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/home/nenad/repos/tempproj/target/debug/deps/stylus_hello_world-67a73fa8d245e82a" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
  = note: /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
          (.text+0x1b): undefined reference to `main'
          collect2: error: ld returned 1 exit status
          
  = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
  = note: use the `-l` flag to specify native libraries to link
  = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#rustc-link-lib)

error: could not compile `stylus-hello-world` (lib test) due to 1 previous error

It seems the problem is caused by main function not being generated when tests are run. The logic for when main is generated needs to be fixed.

---

Another problem, as mentioned above, is that it's necessary to run cargo update before running cargo test, because of an issue with external dependency time:

   Compiling encoding_rs v0.8.33
   Compiling bech32 v0.9.1
   Compiling data-encoding v2.5.0
error[E0282]: type annotations needed for `Box<_>`
  --> /home/nenad/.cargo/registry/src/index.crates.io-6f17d22bba15001f/time-0.3.34/src/format_description/parse/mod.rs:83:9
   |
83 |     let items = format_items
   |         ^^^^^
...
86 |     Ok(items.into())
   |              ---- type must be known at this point
   |
help: consider giving `items` an explicit type, where the placeholders `_` are specified
   |
83 |     let items: Box<_> = format_items
   |              ++++++++

   Compiling sync_wrapper v0.1.2
   Compiling untrusted v0.7.1

Running cargo update solves this issue.