install OpenSSL on Mac with gRPC

Author: duncanpo

CMakeLists.txt

@@ -251,9 +251,9 @@ if(WITH_OTLP_GRPC)
     find_package(absl REQUIRED)
     find_package(c-ares REQUIRED)
     find_package(re2 REQUIRED)
-    if(WIN32)
+    if(WIN32 OR APPLE)
         find_package(openssl REQUIRED)
-    elseif(UNIX AND NOT APPLE AND NOT CYGWIN)
+    elseif(UNIX AND NOT CYGWIN)
         find_package(upb REQUIRED)
     endif()
 endif()
@@ -443,6 +443,10 @@ else()
         set(OTEL_CPP_RUNTIME ${OTEL_CPP_RUNTIME} $<TARGET_FILE:ZLIB::ZLIB> 
            $<TARGET_FILE_DIR:ZLIB::ZLIB>/libz.${ZLIB_MAJOR_VERSION}${CMAKE_SHARED_LIBRARY_SUFFIX}
            $<TARGET_FILE_DIR:ZLIB::ZLIB>/libz.${ZLIB_VERSION}${CMAKE_SHARED_LIBRARY_SUFFIX})
+        
+        if(WITH_OTLP_GRPC)
+            set(OTEL_CPP_RUNTIME ${OTEL_CPP_RUNTIME} $<TARGET_FILE:OpenSSL::SSL>) 
+        endif()
     endif()
     set(OPENTELEMETRY_PROXY_RUNTIME_LIBRARIES ${OTEL_CPP_RUNTIME})
 endif()