build: cmake: find and link against RapidJSON

despite that RapidJSON is a header-only library, we still need to
find it and "link" against it for adding the include directory.

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

CMakeLists.txt

@@ -35,6 +35,7 @@ find_package(ICU COMPONENTS uc i18n REQUIRED)
 find_package(absl REQUIRED)
 find_package(libdeflate REQUIRED)
 find_package(libxcrypt REQUIRED)
+find_package(RapidJSON REQUIRED)
 find_package(Thrift REQUIRED)
 find_package(xxHash REQUIRED)
 

alternator/CMakeLists.txt

@@ -20,7 +20,9 @@ target_sources(alternator
 target_include_directories(alternator
   PUBLIC
     ${CMAKE_SOURCE_DIR}
-    ${CMAKE_BINARY_DIR})
+    ${CMAKE_BINARY_DIR}
+  PRIVATE
+    ${RAPIDJSON_INCLUDE_DIRS})
 target_link_libraries(alternator
   cql3
   idl

tools/CMakeLists.txt

@@ -9,6 +9,7 @@ target_sources(tools
 target_include_directories(tools
   PUBLIC
     ${CMAKE_SOURCE_DIR}
+    ${RAPIDJSON_INCLUDE_DIRS}
   PRIVATE
     ${LUA_INCLUDE_DIR})
 target_link_libraries(tools

utils/CMakeLists.txt

@@ -44,7 +44,8 @@ target_sources(utils
     uuid.cc)
 target_include_directories(utils
   PUBLIC
-    ${CMAKE_SOURCE_DIR})
+    ${CMAKE_SOURCE_DIR}
+    ${RAPIDJSON_INCLUDE_DIRS})
 target_link_libraries(utils
   PUBLIC
     Seastar::seastar