Do not look for ZeroMQ directly as it is a dependency of cppzmq

Also only look for cppzmq if BTCPP_GROOT_INTERFACE

Author: ericriff

3rdparty/cppzmq/CMakeLists.txt

@@ -1,13 +1,6 @@
 find_package(ZeroMQ REQUIRED)
 
 add_library(cppzmq INTERFACE)
-if(TARGET libzmq-static)
-    target_link_libraries(cppzmq INTERFACE libzmq-static)
-elseif(TARGET libzmq)
-    target_link_libraries(cppzmq INTERFACE libzmq)
-else()
-    message(FATAL_ERROR "Failed to find libzmq")
-endif()
 
 # This library doesn't use modern targets unfortunately.
 #add_library(cppzmq::cppzmq ALIAS cppzmq)
@@ -16,3 +9,11 @@ target_include_directories(cppzmq
     INTERFACE
         ${CMAKE_CURRENT_SOURCE_DIR}
 )
+
+if(TARGET libzmq-static)
+    target_link_libraries(cppzmq INTERFACE libzmq-static)
+elseif(TARGET libzmq)
+    target_link_libraries(cppzmq INTERFACE libzmq)
+else()
+    message(FATAL_ERROR "Unknown zeromq target name")
+endif()

CMakeLists.txt

@@ -104,7 +104,11 @@ endif()
 find_package(Threads REQUIRED)
 
 if(BTCPP_GROOT_INTERFACE)
-    find_package(ZeroMQ REQUIRED)
+    if(USE_VENDORED_CPPZMQ)
+        add_subdirectory(3rdparty/cppzmq)
+    else()
+        find_package(cppzmq REQUIRED)
+    endif()
 endif()
 
 if(BTCPP_SQLITE_LOGGING)
@@ -115,11 +119,7 @@ if(BTCPP_SQLITE_LOGGING)
     endif()
 endif()
 
-if(USE_VENDORED_CPPZMQ)
-    add_subdirectory(3rdparty/cppzmq)
-else()
-    find_package(cppzmq REQUIRED)
-endif()
+
 
 if(USE_VENDORED_FLATBUFFERS)
     add_subdirectory(3rdparty/flatbuffers)