Can't compile vendored version for iOS

[ivnsch]

Trying to use rust-openssl on iOS:

[dependencies]
openssl = { version = "0.10.30", features = ["vendored"] }

Build script:

#!/bin/bash

# Ensure that `cargo` is in PATH, using the default location.
export PATH="$PATH:${HOME}/.cargo/bin"

# This obviously doesn't work for the app, only to build on desktop.
export OPENSSL_DIR="/usr/local/opt/openssl"

set -x

# Go to repo's root
cd "${SRCROOT}/../"

# Build binaries
RUSTFLAGS="-Z embed-bitcode" cargo +ios-arm64 build --target aarch64-apple-ios --release --lib
cargo build --target=x86_64-apple-ios --release

# Create fat binary
libtool -static -o ./ios_app/core/libcore ./target/aarch64-apple-ios/release/libcore.a ./target/x86_64-apple-ios/release/libcore.a

When the app is linking, it fails:

+ cd /Users/.../ios_app/../
+ RUSTFLAGS='-Z embed-bitcode'
+ cargo +ios-arm64 build --target aarch64-apple-ios --release --lib
   Compiling openssl v0.10.30
   Compiling openssl-sys v0.9.58
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-m64" "-L" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib" "/Users/.../dev/match/apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.0.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.1.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.2.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.3.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.4.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.5.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.6.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.7.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.8.rcgu.o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.build_script_build.2u6htd52-cgu.9.rcgu.o" "-o" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4" "/Users/.../apps/target/release/build/openssl-c9dd36216d69fda4/build_script_build-c9dd36216d69fda4.2v08avjo20u7n477.rcgu.o" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/Users/.../apps/target/release/deps" "-L" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libstd-fda0e7855b9402e8.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-8db4d246b93490a3.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libhashbrown-045cb03abe14acb0.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_alloc-08f40434a91057b9.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libbacktrace-85e9f4ed0eefd4eb.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libbacktrace_sys-268fe4d097282e32.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/librustc_demangle-58ce83a0b48d29df.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libunwind-93b6de48441f0c71.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libcfg_if-10b40de50aced175.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/liblibc-d2f2a948e54a1b51.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/liballoc-b63539fad2a53809.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_core-115f860040d4f0e8.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libcore-2952e6310f3dc706.rlib" "/Users/.../.rust-ios-arm64/toolchain-1.43.0/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-d051efb0275a42f6.rlib" "-lSystem" "-lresolv" "-lc" "-lm"
  = note: ld: library not found for -lSystem
          clang: error: linker command failed with exit code 1 (use -v to see invocation)
          

error: aborting due to previous error

error: could not compile `openssl`.

According to the docs, for vendored OpenSSL I need a C compiler, perl and make installed:

If the vendored Cargo feature is enabled, the openssl-src crate will be used to compile and statically link to a copy of OpenSSL. The build process requires a C compiler, perl, and make.

I checked: gcc, perl and make run in the terminal. The xcode tools also seem to be installed. I also ran brew update and brew upgrade gcc, just in case.

Someone suggested adding the path to libSystem.a to the linker flags. I couldn't find exactly libSystem.a in the SDK. I tried with libSystem.tbd and it didn't work.

I found a maybe related issue: alexcrichton/openssl-src-rs#41. My error is different and getting it both on the simulator and device.

Any ideas?

[sfackler]

I am not personally familiar with building things for iOS. The issue on openssl-src-rs would be the thing to refer to though.