CRC32C SSE4.2 is disabled for macOS universal build

[BewareMyPower]

See outputs from https://github.com/apache/pulsar-client-python/actions/runs/3236234222/jobs/5301759237

/Users/runner/work/pulsar-client-python/pulsar-client-python/.pulsar-mac-build/cpp/apache-pulsar-client-cpp-3.0.0/lib/checksum/crc32c_sse42.cc:42:2: warning: "BOOST_ARCH_X86_64 is not defined, CRC32C SSE4.2 will be disabled" [-W#warnings]
#warning "BOOST_ARCH_X86_64 is not defined, CRC32C SSE4.2 will be disabled"

/Applications/Xcode_13.2.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: for architecture: x86_64 file: /Users/runner/work/pulsar-client-python/pulsar-client-python/.pulsar-mac-build/cpp/install/lib/libpulsar.a(Log4cxxLogger.cc.o) has no symbols
/Applications/Xcode_13.2.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: for architecture: x86_64 file: /Users/runner/work/pulsar-client-python/pulsar-client-python/.pulsar-mac-build/cpp/install/lib/libpulsar.a(crc32c_arm.cc.o) has no symbols
-- Up-to-date: /Users/runner/work/pulsar-client-python/pulsar-client-python/.pulsar-mac-build/cpp/install/lib/libpulsar.a
/Applications/Xcode_13.2.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: for architecture: x86_64 file: /Users/runner/work/pulsar-client-python/pulsar-client-python/.pulsar-mac-build/cpp/install/lib/libpulsar.a(Log4cxxLogger.cc.o) has no symbols
/Applications/Xcode_13.2.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: for architecture: x86_64 file: /Users/runner/work/pulsar-client-python/pulsar-client-python/.pulsar-mac-build/cpp/install/lib/libpulsar.a(crc32c_arm.cc.o) has no symbols

[BewareMyPower]

If we cannot support SSE 4.2 for ARM64, we should not build universal binaries for Intel-based macOS users. i.e. change the ARCH to x86_64.

pulsar-client-python/pkg/mac/build-pulsar-cpp.sh

Line 46 in ddb1229

ARCHS='arm64;x86_64'

WDYT? @merlimat

[merlimat]

When compiling for multiple archs, the compiler is doing multiple passes. It's normal to not have SSE 4.2 in ARM, so we can ignore this warning message.

[BewareMyPower]

Thanks for your explanation. Close it.