cmake: add option WITH_CORE_TOOLS to exclude tools except ldb and sst_dump (#6506)

Summary:
ldb and sst_dump are most important tools and they don't dependend on gflags. In cmake, we don't have an way to only build these two tools and exclude other tools. This is inconvenient if the environment has a problem with gflags. Add such an option WITH_CORE_TOOLS.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6506

Test Plan: cmake and build with WITH_TOOLS and without.

Differential Revision: D20473029

fbshipit-source-id: 3d730fd14bbae6eeeae7f9cc9aec50a4e488ad72

CMakeLists.txt

@@ -1199,9 +1199,15 @@ if(WITH_BENCHMARK_TOOLS)
     ${ROCKSDB_LIB})
 endif()
 
+option(WITH_CORE_TOOLS "build with ldb and sst_dump" ON)
 option(WITH_TOOLS "build with tools" ON)
-if(WITH_TOOLS)
+if(WITH_CORE_TOOLS OR WITH_TOOLS)
   add_subdirectory(tools)
+  add_custom_target(core_tools
+    DEPENDS ${core_tool_deps})
+endif()
+
+if(WITH_TOOLS)
   add_subdirectory(db_stress_tool)
   add_custom_target(tools
     DEPENDS ${tool_deps})

tools/CMakeLists.txt

@@ -1,8 +1,18 @@
-set(TOOLS
+set(CORE_TOOLS
   sst_dump.cc
+  ldb.cc)
+foreach(src ${CORE_TOOLS})
+  get_filename_component(exename ${src} NAME_WE)
+  add_executable(${exename}${ARTIFACT_SUFFIX}
+    ${src})
+  target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${ROCKSDB_LIB})
+  list(APPEND core_tool_deps ${exename})
+endforeach()
+
+if(WITH_TOOLS)
+  set(TOOLS
     db_sanity_test.cc
     write_stress.cc
-  ldb.cc
     db_repl_stress.cc
     dump/rocksdb_dump.cc
     dump/rocksdb_undump.cc)
@@ -14,8 +24,7 @@ foreach(src ${TOOLS})
     list(APPEND tool_deps ${exename})
   endforeach()
 
-list(APPEND tool_deps)
-
   add_custom_target(ldb_tests
     COMMAND python ${CMAKE_CURRENT_SOURCE_DIR}/ldb_tests.py
     DEPENDS ldb)
+endif()