Build failed with ssl features on mac m1

[aiyajsupra]

Build is failing with following message when we run rdkafka with ssl feature enabled on mac m1.

          Undefined symbols for architecture arm64:
            "_SSL_get1_peer_certificate", referenced from:
                _rd_kafka_transport_ssl_handshake in librdkafka_sys-66bfa0eb454c4b25.rlib(rdkafka_ssl.c.o)
          ld: symbol(s) not found for architecture arm64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

openssl version: OpenSSL 1.1.1q  5 Jul 2022
uname -m: arm64

[drake-cloudwalk]

Exporting the OPENSSL_ROOT_DIR makes the build works for me.

Example:
export OPENSSL_ROOT_DIR="/opt/homebrew/opt/openssl@3"

[benesch]

This is expected behavior. If you enable the ssl feature, rdkafka-sys will link against your system's OpenSSL. On an M1 Mac, there is no system OpenSSL unless you install OpenSSL with Homebrew and set OPENSSL_ROOT_DIR, as demonstrated above. You can instead use the ssl-vendored feature if you'd prefer to have Cargo download and build a bundled copy of OpenSSL.