Unable to Compile Project Without Openssl Crate

[emnul]

I have a project with the following Cargo.toml file:

[dependencies]
koba = "0.2.0"
serde = "1"
lambda_runtime = "0.13.0"
alloy-primitives = { version = "0.3.1", default-features = false }
alloy = { version = "0.1.1", features = [
   "contract",
   "network",
   "providers",
   "provider-http",
   "rpc-client",
   "rpc-types-eth",
   "signer-local",
   "getrandom",
] }
tokio = { version = "1", features = ["full"] }
# openssl = { version = "0.10.64", features = ["vendored"] }

When I try to compile the project with cargo lambda build I get the following error:

0] % cargo lambda build
   Compiling openssl-sys v0.9.103
error: failed to run custom build command for `openssl-sys v0.9.103`

Caused by:
  process didn't exit successfully: `path/KOBA_POC/lambda/target/debug/build/openssl-sys-a0b9a8a26589113f/build-script-main` (exit status: 101)
  --- stdout
  cargo:rustc-check-cfg=cfg(osslconf, values("OPENSSL_NO_OCB", "OPENSSL_NO_SM4", "OPENSSL_NO_SEED", "OPENSSL_NO_CHACHA", "OPENSSL_NO_CAST", "OPENSSL_NO_IDEA", "OPENSSL_NO_CAMELLIA", "OPENSSL_NO_RC4", "OPENSSL_NO_BF", "OPENSSL_NO_PSK", "OPENSSL_NO_DEPRECATED_3_0", "OPENSSL_NO_SCRYPT", "OPENSSL_NO_SM3", "OPENSSL_NO_RMD160", "OPENSSL_NO_EC2M", "OPENSSL_NO_OCSP", "OPENSSL_NO_CMS", "OPENSSL_NO_COMP", "OPENSSL_NO_SOCK", "OPENSSL_NO_STDIO"))
  cargo:rustc-check-cfg=cfg(openssl)
  cargo:rustc-check-cfg=cfg(libressl)
  cargo:rustc-check-cfg=cfg(boringssl)
  cargo:rustc-check-cfg=cfg(libressl250)
  cargo:rustc-check-cfg=cfg(libressl251)
  cargo:rustc-check-cfg=cfg(libressl252)
  cargo:rustc-check-cfg=cfg(libressl261)
  cargo:rustc-check-cfg=cfg(libressl270)
  cargo:rustc-check-cfg=cfg(libressl271)
  cargo:rustc-check-cfg=cfg(libressl273)
  cargo:rustc-check-cfg=cfg(libressl280)
  cargo:rustc-check-cfg=cfg(libressl281)
  cargo:rustc-check-cfg=cfg(libressl291)
  cargo:rustc-check-cfg=cfg(libressl310)
  cargo:rustc-check-cfg=cfg(libressl321)
  cargo:rustc-check-cfg=cfg(libressl332)
  cargo:rustc-check-cfg=cfg(libressl340)
  cargo:rustc-check-cfg=cfg(libressl350)
  cargo:rustc-check-cfg=cfg(libressl360)
  cargo:rustc-check-cfg=cfg(libressl361)
  cargo:rustc-check-cfg=cfg(libressl370)
  cargo:rustc-check-cfg=cfg(libressl380)
  cargo:rustc-check-cfg=cfg(libressl381)
  cargo:rustc-check-cfg=cfg(libressl382)
  cargo:rustc-check-cfg=cfg(libressl390)
  cargo:rustc-check-cfg=cfg(libressl400)
  cargo:rustc-check-cfg=cfg(ossl101)
  cargo:rustc-check-cfg=cfg(ossl102)
  cargo:rustc-check-cfg=cfg(ossl102f)
  cargo:rustc-check-cfg=cfg(ossl102h)
  cargo:rustc-check-cfg=cfg(ossl110)
  cargo:rustc-check-cfg=cfg(ossl110f)
  cargo:rustc-check-cfg=cfg(ossl110g)
  cargo:rustc-check-cfg=cfg(ossl110h)
  cargo:rustc-check-cfg=cfg(ossl111)
  cargo:rustc-check-cfg=cfg(ossl111b)
  cargo:rustc-check-cfg=cfg(ossl111c)
  cargo:rustc-check-cfg=cfg(ossl111d)
  cargo:rustc-check-cfg=cfg(ossl300)
  cargo:rustc-check-cfg=cfg(ossl310)
  cargo:rustc-check-cfg=cfg(ossl320)
  cargo:rustc-check-cfg=cfg(ossl330)
  cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR
  X86_64_UNKNOWN_LINUX_GNU_OPENSSL_LIB_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_LIB_DIR
  OPENSSL_LIB_DIR unset
  cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR
  X86_64_UNKNOWN_LINUX_GNU_OPENSSL_INCLUDE_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_INCLUDE_DIR
  OPENSSL_INCLUDE_DIR unset
  cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR
  X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_DIR
  OPENSSL_DIR unset
  cargo:rerun-if-env-changed=OPENSSL_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_ALLOW_CROSS
  cargo:rerun-if-env-changed=PKG_CONFIG_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=TARGET_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  run pkg_config fail: pkg-config has not been configured to support cross-compilation.

  Install a sysroot for the target platform and configure it via
  PKG_CONFIG_SYSROOT_DIR and PKG_CONFIG_PATH, or install a
  cross-compiling wrapper for pkg-config and set it via
  PKG_CONFIG environment variable.

  --- stderr
  thread 'main' panicked at /Users/emnul/.cargo/registry/src/index.crates.io-6f17d22bba15001f/openssl-sys-0.9.103/build/find_normal.rs:190:5:

  Could not find directory of OpenSSL installation, and this `-sys` crate cannot
  proceed without this knowledge. If OpenSSL is installed and this crate had
  trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
  compilation process.

  Make sure you also have the development packages of openssl installed.
  For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora.

  If you're in a situation where you think the directory *should* be found
  automatically, please open a bug at https://github.com/sfackler/rust-openssl
  and include information about your system as well as this message.

  $HOST = aarch64-apple-darwin
  $TARGET = x86_64-unknown-linux-gnu
  openssl-sys = 0.9.103

  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Adding openssl to my Cargo.toml fixes this issue, but I'd like to know what the root cause of the issue is so I can avoid an unnecessary dependency if possible.

It seems lambda-runtime depends on openssl for... reasons??

cargo tree

├── lambda_runtime v0.13.0
...
├── openssl v0.10.66
│   ├── bitflags v2.6.0
│   ├── cfg-if v1.0.0
│   ├── foreign-types v0.3.2
│   │   └── foreign-types-shared v0.1.1
│   ├── libc v0.2.155
│   ├── once_cell v1.19.0
│   ├── openssl-macros v0.1.1 (proc-macro)
│   │   ├── proc-macro2 v1.0.86 (*)
│   │   ├── quote v1.0.36 (*)
│   │   └── syn v2.0.74 (*)
│   └── openssl-sys v0.9.103
│       └── libc v0.2.155
│       [build-dependencies]
│       ├── cc v1.1.10
│       ├── openssl-src v300.3.1+3.3.1
│       │   └── cc v1.1.10
│       ├── pkg-config v0.3.30
│       └── vcpkg v0.2.15
...

I suspect the native binaries on my local machine aren't playing nice with cargo lambda's cross compilation. Any help would be greatly appreciated.

Thanks!

[calavera]

The runtime does not depend on OpenSSL. It's probably a transitive dependency from one of the dependencies in your project, most likely alloy.

There are some recommendations on how to deal with this kind of problems in Cargo Lambda's documentation: https://www.cargo-lambda.info/guide/cross-compiling.html#known-cross-compilation-issues

[emnul]

Yup, you're totally right. Alloy has the following dep: reqwest = { version = "0.12", default-features = false } which is known to cause build issues with cargo lambda.

Thanks for making this more clear!

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