librdkafka: Opportunistically uses lots of libraries

[ryandesign (Ryan Carsten Schmidt)]

librdkafka opportunistically uses lots of libraries.

The binary built by our build server on which no extra libraries would be installed has the following linkage:

$ otool -L ./opt/local/lib/librdkafka.1.dylib
./opt/local/lib/librdkafka.1.dylib:
	/opt/local/lib/librdkafka.1.dylib (compatibility version 0.0.0, current version 0.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
	/usr/lib/libsasl2.2.dylib (compatibility version 3.0.0, current version 3.15.0)
	/usr/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.11)

In contrast, building it from source on my own computer which has many extra libraries installed had the following linkage:

$ otool -L ./opt/local/lib/librdkafka.1.dylib
./opt/local/lib/librdkafka.1.dylib:
	/opt/local/lib/librdkafka.1.dylib (compatibility version 0.0.0, current version 0.0.0)
	/opt/local/lib/liblz4.1.dylib (compatibility version 1.0.0, current version 1.9.2)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
	/opt/local/lib/libzstd.1.dylib (compatibility version 1.0.0, current version 1.4.4)
	/opt/local/lib/libsasl2.3.dylib (compatibility version 4.0.0, current version 4.0.0)
	/opt/local/lib/libssl.1.1.dylib (compatibility version 1.1.0, current version 1.1.0)
	/opt/local/lib/libcrypto.1.1.dylib (compatibility version 1.1.0, current version 1.1.0)
	/opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.11)

As you can see there are lots of MacPorts libraries that librdkafka will link with if they exist. For each such library, one of two fixes could be employed: either add the dependency on the corresponding MacPorts port or tell the build system not to use that library even if it is present. And then the revision would need to be increased.

[alexeyt820]

In 5ce3b00ccae3971cf23b55b4cd38143cc0f7acca/macports-ports (master):

librdkafka: fix opportunistic linkage

Fixes: #60485