Cross-compiling issue with libcrypto on Linux

[hedgar2017]

I have an Ubuntu Docker image which cross-compiles my application for MacOS.
I use osxcross tools and the OpenSSL 1.1.1g build.
All the crates which depend on openssl-sys are built without errors, but I have an issue with sqlx-macros, which requires some libcrypto symbols, and for some reason rustc is unable to find the library.

   Compiling sqlx v0.4.0-beta.1
     Running `rustc --crate-name sqlx --edition=2018 /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/sqlx-0.4.0-beta.1/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -Cembed-bitcode=no --cfg 'feature="json"' --cfg 'feature="macros"' --cfg 'feature="postgres"' --cfg 'feature="runtime-async-std"' --cfg 'feature="sqlx-macros"' -C metadata=7c40358ea7c4ec8a -C extra-filename=-7c40358ea7c4ec8a --out-dir /zinc-dev/target/x86_64-apple-darwin/release/deps --target x86_64-apple-darwin -C linker=x86_64-apple-darwin14-clang -L dependency=/zinc-dev/target/x86_64-apple-darwin/release/deps -L dependency=/zinc-dev/target/release/deps --extern sqlx_core=/zinc-dev/target/x86_64-apple-darwin/release/deps/libsqlx_core-97f61aca60bd39af.rmeta --extern sqlx_macros=/zinc-dev/target/release/deps/libsqlx_macros-e396e661b598d675.so --cap-lints allow -L '/zinc-dev/[email protected]/1.1.1g/lib/' -C link-args=-lssl -C link-args=-lcrypto`
error: /zinc-dev/target/release/deps/libsqlx_macros-e396e661b598d675.so: undefined symbol: PKCS5_PBKDF2_HMAC
  --> /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/sqlx-0.4.0-beta.1/src/lib.rs:59:1
   |
59 | pub extern crate sqlx_macros;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

error: could not compile `sqlx`.

Could you please give a hint?

[hedgar2017]

I tried to specify linker flags in different manners, but with no effect:
-L '/zinc-dev/[email protected]/1.1.1g/lib/' -C link-args=-lssl -C link-args=-lcrypto
-L '/zinc-dev/[email protected]/1.1.1g/lib/' -lssl -lcrypto

.cargo/config:

[target.x86_64-apple-darwin]
linker = "x86_64-apple-darwin14-clang"
ar = "x86_64-apple-darwin14-ar"
rustflags = [
    "-L", "/zinc-dev/[email protected]/1.1.1g/lib",
    "-C", "link-args=-lssl",
    "-C", "link-args=-lcrypto",
]

[emk]

I am not associated with sqlx in any way, but I've recently managed to get this working for musl-libc targets using my Docker image https://github.com/emk/rust-musl-builder. I am happy to support this use case and help improve the documentation.

For a discussion of the various fixes and workarounds people have used, see #670.

[hedgar2017]

@emk , thank you very much!
It seems unrelated to my specific MacOS cross-compiling case, but I have found some other potentially viable solutions there.

[hedgar2017]

@emk , thanks one more time!
Adding

[dependencies.openssl]
version = "0.10"
features = [
    "vendored"
]

to Cargo.toml of the application depending on sqlx-macros worked like a charm!