build: always add the Speedb plugin to the build (#87)

This allows us to make sure that our additions are included
in the build even if the user forgot to set `ROCKSDB_PLUGINS`
explicitly.

CMakeLists.txt

@@ -976,12 +976,17 @@ list(APPEND SOURCES
   utilities/transactions/lock/range/range_tree/lib/util/dbt.cc
   utilities/transactions/lock/range/range_tree/lib/util/memarena.cc)
 
+if (ROCKSDB_PLUGINS)
+  separate_arguments(ROCKSDB_PLUGINS)
+endif()
+if (NOT ROCKSDB_PLUGINS OR NOT "speedb" IN_LIST ROCKSDB_PLUGINS)
+  list(APPEND ROCKSDB_PLUGINS speedb)
+endif()
 set(ROCKSDB_PLUGIN_EXTERNS "")
 set(ROCKSDB_PLUGIN_BUILTINS "")
 message(STATUS "ROCKSDB_PLUGINS: ${ROCKSDB_PLUGINS}")
-if ( ROCKSDB_PLUGINS )
-  string(REPLACE " " ";" PLUGINS ${ROCKSDB_PLUGINS})
-  foreach (plugin ${PLUGINS})
+if( ROCKSDB_PLUGINS )
+  foreach (plugin ${ROCKSDB_PLUGINS})
     set(plugin_root "plugin/${plugin}/")
     add_subdirectory(${plugin_root})
     # Use get_directory_property() to avoid having to declare the variables

Makefile

@@ -255,6 +255,10 @@ dummy := $(shell (export ROCKSDB_ROOT="$(CURDIR)"; \
 # this file is generated by the previous line to set build flags and sources
 include make_config.mk
 
+ifeq ($(strip $(filter speedb,$(ROCKSDB_PLUGINS))),)
+ROCKSDB_PLUGINS += speedb
+endif
+
 ROCKSDB_PLUGIN_MKS = $(foreach plugin, $(ROCKSDB_PLUGINS), plugin/$(plugin)/*.mk)
 include $(ROCKSDB_PLUGIN_MKS)
 ROCKSDB_PLUGIN_PROTO =ROCKSDB_NAMESPACE::ObjectLibrary\&, const std::string\&