Add an option to the CMake build to disable building shared libraries (#6122)

Summary:
Add an option to explicitly disable building shared versions of the
RocksDB libraries.  The shared libraries cannot be built in cases where
some dependencies are only available as static libraries.  This allows
still building RocksDB in these situations.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6122

Differential Revision: D18920740

fbshipit-source-id: d24f66d93c68a1e65635e6e0b663bae62c903bca

CMakeLists.txt

@@ -766,7 +766,8 @@ endif()
 
 set(ROCKSDB_STATIC_LIB rocksdb${ARTIFACT_SUFFIX})
 set(ROCKSDB_SHARED_LIB rocksdb-shared${ARTIFACT_SUFFIX})
-set(ROCKSDB_IMPORT_LIB ${ROCKSDB_SHARED_LIB})
+
+option(ROCKSDB_BUILD_SHARED "Build shared versions of the RocksDB libraries" ON)
 
 option(WITH_LIBRADOS "Build with librados" OFF)
 if(WITH_LIBRADOS)
@@ -777,38 +778,42 @@ endif()
 
 if(WIN32)
   set(SYSTEM_LIBS ${SYSTEM_LIBS} shlwapi.lib rpcrt4.lib)
-  set(LIBS ${ROCKSDB_STATIC_LIB} ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
 else()
   set(SYSTEM_LIBS ${CMAKE_THREAD_LIBS_INIT})
-  set(LIBS ${ROCKSDB_SHARED_LIB} ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
-
-  add_library(${ROCKSDB_SHARED_LIB} SHARED ${SOURCES})
-  target_link_libraries(${ROCKSDB_SHARED_LIB}
-    ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
-  set_target_properties(${ROCKSDB_SHARED_LIB} PROPERTIES
-                        LINKER_LANGUAGE CXX
-                        VERSION ${rocksdb_VERSION}
-                        SOVERSION ${rocksdb_VERSION_MAJOR}
-                        CXX_STANDARD 11
-                        OUTPUT_NAME "rocksdb")
 endif()
 
 add_library(${ROCKSDB_STATIC_LIB} STATIC ${SOURCES})
 target_link_libraries(${ROCKSDB_STATIC_LIB}
   ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
 
-if(WIN32)
-  add_library(${ROCKSDB_IMPORT_LIB} SHARED ${SOURCES})
-  target_link_libraries(${ROCKSDB_IMPORT_LIB}
+if(ROCKSDB_BUILD_SHARED)
+  add_library(${ROCKSDB_SHARED_LIB} SHARED ${SOURCES})
+  target_link_libraries(${ROCKSDB_SHARED_LIB}
     ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
-  set_target_properties(${ROCKSDB_IMPORT_LIB} PROPERTIES
+
+  if(WIN32)
+    set_target_properties(${ROCKSDB_SHARED_LIB} PROPERTIES
       COMPILE_DEFINITIONS "ROCKSDB_DLL;ROCKSDB_LIBRARY_EXPORTS")
     if(MSVC)
       set_target_properties(${ROCKSDB_STATIC_LIB} PROPERTIES
         COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/${ROCKSDB_STATIC_LIB}.pdb")
-    set_target_properties(${ROCKSDB_IMPORT_LIB} PROPERTIES
-      COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/${ROCKSDB_IMPORT_LIB}.pdb")
+      set_target_properties(${ROCKSDB_SHARED_LIB} PROPERTIES
+        COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/${ROCKSDB_SHARED_LIB}.pdb")
     endif()
+  else()
+    set_target_properties(${ROCKSDB_SHARED_LIB} PROPERTIES
+                          LINKER_LANGUAGE CXX
+                          VERSION ${rocksdb_VERSION}
+                          SOVERSION ${rocksdb_VERSION_MAJOR}
+                          CXX_STANDARD 11
+                          OUTPUT_NAME "rocksdb")
+  endif()
+endif()
+
+if(ROCKSDB_BUILD_SHARED AND NOT WIN32)
+  set(ROCKSDB_LIB ${ROCKSDB_SHARED_LIB})
+else()
+  set(ROCKSDB_LIB ${ROCKSDB_STATIC_LIB})
 endif()
 
 option(WITH_JNI "build with JNI" OFF)
@@ -857,6 +862,7 @@ if(NOT WIN32 OR ROCKSDB_INSTALL_ON_WINDOWS)
     INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
   )
 
+  if(ROCKSDB_BUILD_SHARED)
     install(
       TARGETS ${ROCKSDB_SHARED_LIB}
       EXPORT RocksDBTargets
@@ -866,6 +872,7 @@ if(NOT WIN32 OR ROCKSDB_INSTALL_ON_WINDOWS)
       LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
       INCLUDES DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
     )
+  endif()
 
   install(
     EXPORT RocksDBTargets
@@ -1052,7 +1059,7 @@ if(WITH_TESTS AND CMAKE_BUILD_TYPE STREQUAL "Debug")
   add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND})
   set(TESTUTILLIB testutillib${ARTIFACT_SUFFIX})
   add_library(${TESTUTILLIB} STATIC ${TESTUTIL_SOURCE})
-  target_link_libraries(${TESTUTILLIB} ${LIBS})
+  target_link_libraries(${TESTUTILLIB} ${ROCKSDB_LIB})
   if(MSVC)
     set_target_properties(${TESTUTILLIB} PROPERTIES COMPILE_FLAGS "/Fd${CMAKE_CFG_INTDIR}/testutillib${ARTIFACT_SUFFIX}.pdb")
   endif()
@@ -1073,14 +1080,25 @@ if(WITH_TESTS AND CMAKE_BUILD_TYPE STREQUAL "Debug")
         EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
         OUTPUT_NAME ${exename}${ARTIFACT_SUFFIX}
         )
-      target_link_libraries(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} testutillib${ARTIFACT_SUFFIX} gtest ${LIBS})
+      target_link_libraries(${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX} testutillib${ARTIFACT_SUFFIX} gtest ${ROCKSDB_LIB})
       if(NOT "${exename}" MATCHES "db_sanity_test")
         add_test(NAME ${exename} COMMAND ${exename}${ARTIFACT_SUFFIX})
         add_dependencies(check ${CMAKE_PROJECT_NAME}_${exename}${ARTIFACT_SUFFIX})
       endif()
   endforeach(sourcefile ${TEST_EXES})
 
+  if(WIN32)
     # C executables must link to a shared object
+    if(ROCKSDB_BUILD_SHARED)
+      set(ROCKSDB_LIB_FOR_C ${ROCKSDB_SHARED_LIB})
+    else()
+      set(ROCKSDB_LIB_FOR_C OFF)
+    endif()
+  else()
+    set(ROCKSDB_LIB_FOR_C ${ROCKSDB_LIB})
+  endif()
+
+  if(ROCKSDB_LIB_FOR_C)
     set(C_TESTS db/c_test.c)
     set(C_TEST_EXES ${C_TESTS})
 
@@ -1093,11 +1111,12 @@ if(WITH_TESTS AND CMAKE_BUILD_TYPE STREQUAL "Debug")
           EXCLUDE_FROM_DEFAULT_BUILD_MINRELEASE 1
           EXCLUDE_FROM_DEFAULT_BUILD_RELWITHDEBINFO 1
           )
-      target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${ROCKSDB_IMPORT_LIB} testutillib${ARTIFACT_SUFFIX})
+        target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${ROCKSDB_LIB_FOR_C} testutillib${ARTIFACT_SUFFIX})
         add_test(NAME ${exename} COMMAND ${exename}${ARTIFACT_SUFFIX})
         add_dependencies(check ${exename}${ARTIFACT_SUFFIX})
     endforeach(sourcefile ${C_TEST_EXES})
   endif()
+endif()
 
 option(WITH_BENCHMARK_TOOLS "build with benchmarks" ON)
 if(WITH_BENCHMARK_TOOLS)
@@ -1117,14 +1136,14 @@ if(WITH_BENCHMARK_TOOLS)
     get_filename_component(exename ${sourcefile} NAME_WE)
     add_executable(${exename}${ARTIFACT_SUFFIX} ${sourcefile}
       $<TARGET_OBJECTS:testharness>)
-    target_link_libraries(${exename}${ARTIFACT_SUFFIX} gtest ${LIBS})
+    target_link_libraries(${exename}${ARTIFACT_SUFFIX} gtest ${ROCKSDB_LIB})
   endforeach(sourcefile ${BENCHMARKS})
 
   add_executable(db_bench${ARTIFACT_SUFFIX}
     tools/db_bench.cc
     tools/db_bench_tool.cc
     $<TARGET_OBJECTS:testharness>)
-  target_link_libraries(db_bench${ARTIFACT_SUFFIX} gtest ${LIBS})
+  target_link_libraries(db_bench${ARTIFACT_SUFFIX} gtest ${ROCKSDB_LIB})
 endif()
 
 option(WITH_TOOLS "build with tools" ON)

db_stress_tool/CMakeLists.txt

@@ -10,5 +10,5 @@ add_executable(db_stress${ARTIFACT_SUFFIX}
   db_stress_gflags.cc
   db_stress_tool.cc
   no_batched_ops_stress.cc)
-target_link_libraries(db_stress${ARTIFACT_SUFFIX} ${LIBS})
+target_link_libraries(db_stress${ARTIFACT_SUFFIX} ${ROCKSDB_LIB})
 list(APPEND tool_deps db_stress)

java/CMakeLists.txt

@@ -484,13 +484,13 @@ endif()
 set(ROCKSDBJNI_STATIC_LIB rocksdbjni${ARTIFACT_SUFFIX})
 add_library(${ROCKSDBJNI_STATIC_LIB} ${JNI_NATIVE_SOURCES})
 add_dependencies(${ROCKSDBJNI_STATIC_LIB} rocksdbjni_headers)
-target_link_libraries(${ROCKSDBJNI_STATIC_LIB} ${ROCKSDB_STATIC_LIB} ${LIBS})
+target_link_libraries(${ROCKSDBJNI_STATIC_LIB} ${ROCKSDB_STATIC_LIB} ${ROCKSDB_LIB})
 
 if(NOT MINGW)
   set(ROCKSDBJNI_SHARED_LIB rocksdbjni-shared${ARTIFACT_SUFFIX})
   add_library(${ROCKSDBJNI_SHARED_LIB} SHARED ${JNI_NATIVE_SOURCES})
   add_dependencies(${ROCKSDBJNI_SHARED_LIB} rocksdbjni_headers)
-  target_link_libraries(${ROCKSDBJNI_SHARED_LIB} ${ROCKSDB_STATIC_LIB} ${LIBS})
+  target_link_libraries(${ROCKSDBJNI_SHARED_LIB} ${ROCKSDB_STATIC_LIB} ${ROCKSDB_LIB})
 
   set_target_properties(
     ${ROCKSDBJNI_SHARED_LIB}

tools/CMakeLists.txt

@@ -10,7 +10,7 @@ foreach(src ${TOOLS})
   get_filename_component(exename ${src} NAME_WE)
   add_executable(${exename}${ARTIFACT_SUFFIX}
     ${src})
-  target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${LIBS})
+  target_link_libraries(${exename}${ARTIFACT_SUFFIX} ${ROCKSDB_LIB})
   list(APPEND tool_deps ${exename})
 endforeach()