cmake: Build `leveldb` static library

Co-authored-by: Cory Fields <cory-nospam-@coryfields.com>

CMakeLists.txt

@@ -210,6 +210,7 @@ try_append_cxx_flags("-fstack-reuse=none" TARGET core_interface)
 set(CMAKE_SKIP_BUILD_RPATH TRUE)
 set(CMAKE_SKIP_INSTALL_RPATH TRUE)
 include(cmake/crc32c.cmake)
+include(cmake/leveldb.cmake)
 add_subdirectory(src)
 
 message("\n")

cmake/leveldb.cmake

@@ -0,0 +1,105 @@
+# Copyright (c) 2023-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+# This file is part of the transition from Autotools to CMake. Once CMake
+# support has been merged we should switch to using the upstream CMake
+# buildsystem.
+
+include(CheckCXXSymbolExists)
+check_cxx_symbol_exists(F_FULLFSYNC "fcntl.h" HAVE_FULLFSYNC)
+
+add_library(leveldb STATIC EXCLUDE_FROM_ALL
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/builder.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/c.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/db_impl.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/db_iter.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/dbformat.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/dumpfile.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/filename.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/log_reader.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/log_writer.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/memtable.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/repair.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/table_cache.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/version_edit.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/version_set.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/db/write_batch.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/block.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/block_builder.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/filter_block.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/format.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/iterator.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/merger.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/table.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/table_builder.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/table/two_level_iterator.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/arena.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/bloom.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/cache.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/coding.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/comparator.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/crc32c.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/env.cc
+  $<$<NOT:$<BOOL:${WIN32}>>:${PROJECT_SOURCE_DIR}/src/leveldb/util/env_posix.cc>
+  $<$<BOOL:${WIN32}>:${PROJECT_SOURCE_DIR}/src/leveldb/util/env_windows.cc>
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/filter_policy.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/hash.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/histogram.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/logging.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/options.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/util/status.cc
+  ${PROJECT_SOURCE_DIR}/src/leveldb/helpers/memenv/memenv.cc
+)
+
+target_compile_definitions(leveldb
+  PRIVATE
+    HAVE_SNAPPY=0
+    HAVE_CRC32C=1
+    HAVE_FDATASYNC=$<BOOL:${HAVE_FDATASYNC}>
+    HAVE_FULLFSYNC=$<BOOL:${HAVE_FULLFSYNC}>
+    HAVE_O_CLOEXEC=$<BOOL:${HAVE_O_CLOEXEC}>
+    FALLTHROUGH_INTENDED=[[fallthrough]]
+    LEVELDB_IS_BIG_ENDIAN=$<STREQUAL:${CMAKE_CXX_BYTE_ORDER},BIG_ENDIAN>
+    $<$<NOT:$<BOOL:${WIN32}>>:LEVELDB_PLATFORM_POSIX>
+    $<$<BOOL:${WIN32}>:LEVELDB_PLATFORM_WINDOWS>
+    $<$<BOOL:${WIN32}>:_UNICODE;UNICODE>
+)
+if(MINGW)
+  target_compile_definitions(leveldb
+    PRIVATE
+      __USE_MINGW_ANSI_STDIO=1
+  )
+endif()
+
+target_include_directories(leveldb
+  PRIVATE
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src/leveldb>
+  PUBLIC
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src/leveldb/include>
+)
+
+add_library(nowarn_leveldb_interface INTERFACE)
+if(MSVC)
+  target_compile_options(nowarn_leveldb_interface INTERFACE
+    /wd4722
+  )
+  target_compile_definitions(nowarn_leveldb_interface INTERFACE
+    _CRT_NONSTDC_NO_WARNINGS
+  )
+else()
+  target_compile_options(nowarn_leveldb_interface INTERFACE
+    -Wno-conditional-uninitialized
+    -Wno-suggest-override
+  )
+endif()
+
+target_link_libraries(leveldb PRIVATE
+  core_interface
+  nowarn_leveldb_interface
+  crc32c
+)
+
+set_target_properties(leveldb PROPERTIES
+  EXPORT_COMPILE_COMMANDS OFF
+)