cmake: Build leveldb static library

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

Github-Pull: #6
Rebased-From: df89945

CMakeLists.txt

@@ -64,6 +64,7 @@ include(CheckSourceCompilesAndLinks)
 include(cmake/introspection.cmake)
 
 include(cmake/crc32c.cmake)
+include(cmake/leveldb.cmake)
 
 add_subdirectory(src)
 

cmake/leveldb.cmake

@@ -0,0 +1,94 @@
+# Copyright (c) 2023 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+# 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
+  ${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
+)
+if(WIN32)
+  target_sources(leveldb PRIVATE ${PROJECT_SOURCE_DIR}/src/leveldb/util/env_windows.cc)
+  set_property(SOURCE ${PROJECT_SOURCE_DIR}/src/leveldb/util/env_windows.cc
+    APPEND PROPERTY COMPILE_OPTIONS $<$<AND:$<CXX_COMPILER_ID:MSVC>,$<CONFIG:Release>>:/wd4722>
+  )
+else()
+  target_sources(leveldb PRIVATE ${PROJECT_SOURCE_DIR}/src/leveldb/util/env_posix.cc)
+endif()
+
+target_compile_definitions(leveldb
+  PRIVATE
+    HAVE_SNAPPY=0
+    HAVE_CRC32C=1
+    HAVE_FDATASYNC=$<BOOL:${HAVE_FDATASYNC}>
+    HAVE_FULLFSYNC=$<BOOL:${HAVE_FULLFSYNC}>
+    HAVE_O_CLOEXEC=$<BOOL:${HAVE_O_CLOEXEC}>
+    FALLTHROUGH_INTENDED=[[fallthrough]]
+    LEVELDB_IS_BIG_ENDIAN=${WORDS_BIGENDIAN}
+)
+
+if(WIN32)
+  target_compile_definitions(leveldb
+    PRIVATE
+      LEVELDB_PLATFORM_WINDOWS
+      _UNICODE
+      UNICODE
+      __USE_MINGW_ANSI_STDIO=1
+  )
+else()
+  target_compile_definitions(leveldb PRIVATE LEVELDB_PLATFORM_POSIX)
+endif()
+
+target_include_directories(leveldb
+  PRIVATE
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src/leveldb>
+  PUBLIC
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/src/leveldb/include>
+)
+
+#TODO: figure out how to filter out:
+# -Wconditional-uninitialized -Werror=conditional-uninitialized -Wsuggest-override -Werror=suggest-override
+
+target_link_libraries(leveldb PRIVATE crc32c)