Add: Standalone SQLite binary

Closes #358

CMakeLists.txt

@@ -9,6 +9,7 @@ project(
 
 # Determine if USearch is built as a subproject (using `add_subdirectory`) or if it is the main project
 set(USEARCH_IS_MAIN_PROJECT OFF)
+
 if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
     set(USEARCH_IS_MAIN_PROJECT ON)
 endif ()
@@ -31,6 +32,7 @@ option(USEARCH_BUILD_BENCH_CPP "Compile a native benchmark in C++" ${USEARCH_IS_
 option(USEARCH_BUILD_LIB_C "Compile a native library for the C 99 interface" OFF)
 option(USEARCH_BUILD_TEST_C "Compile a test for the C 99 interface" OFF)
 option(USEARCH_BUILD_WOLFRAM "Compile Wolfram Language bindings" OFF)
+option(USEARCH_BUILD_SQLITE "Compile separate SQLite extension" OFF)
 
 # Includes
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
@@ -56,6 +58,7 @@ set(USEARCH_PKGCONFIG_INSTALL_DIR "${CMAKE_INSTALL_DATADIR}/pkgconfig")
 add_library(${USEARCH_TARGET_NAME} INTERFACE)
 add_library(${PROJECT_NAME}::${USEARCH_TARGET_NAME} ALIAS ${USEARCH_TARGET_NAME})
 set(USEARCH_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
+
 if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
     target_compile_features(${USEARCH_TARGET_NAME} INTERFACE cxx_range_for)
 else ()
@@ -122,6 +125,7 @@ if (CMAKE_HOST_SYSTEM_NAME MATCHES "Darwin")
     set(CMAKE_USE_PTHREADS_INIT 1)
     set(THREADS_PREFER_PTHREAD_FLAG ON)
 endif ()
+
 find_package(Threads REQUIRED)
 
 if (USEARCH_USE_OPENMP)
@@ -291,6 +295,7 @@ function (setup_target TARGET_NAME)
     # On Linux and MacOS our primary shared libraries for C are called `libusearch_c.so` and `libusearch_c.dylib`, while
     # on Windows the "lib" prefix might be missing by default, so let's ensure it's always there
     get_target_property(TARGET_TYPE ${TARGET_NAME} TYPE)
+
     if (TARGET_TYPE STREQUAL "SHARED_LIBRARY" OR TARGET_TYPE STREQUAL "STATIC_LIBRARY")
         set_target_properties(${TARGET_NAME} PROPERTIES PREFIX "lib")
     endif ()
@@ -299,12 +304,9 @@ function (setup_target TARGET_NAME)
     target_compile_definitions(${TARGET_NAME} PRIVATE $<$<NOT:$<BOOL:${USEARCH_USE_OPENMP}>>:USEARCH_USE_OPENMP=0>)
 
     # Supplementary compilation settings affecting "index_plugins.hpp"
-    target_compile_definitions(
-        ${TARGET_NAME} PRIVATE $<$<NOT:$<BOOL:${USEARCH_USE_FP16LIB}>>:USEARCH_USE_FP16LIB=1>
-    )
+    target_compile_definitions(${TARGET_NAME} PRIVATE $<$<NOT:$<BOOL:${USEARCH_USE_FP16LIB}>>:USEARCH_USE_FP16LIB=1>)
 
     target_compile_definitions(${TARGET_NAME} PRIVATE $<$<NOT:$<BOOL:${USEARCH_USE_SIMSIMD}>>:USEARCH_USE_SIMSIMD=0>)
-
 endfunction ()
 
 if (${USEARCH_BUILD_TEST_CPP} OR ${USEARCH_BUILD_BENCH_CPP})
@@ -322,3 +324,7 @@ endif ()
 if (${USEARCH_BUILD_LIB_C} OR ${USEARCH_BUILD_TEST_C})
     add_subdirectory(c)
 endif ()
+
+if (${USEARCH_BUILD_SQLITE})
+    add_subdirectory(sqlite)
+endif ()

CONTRIBUTING.md

@@ -45,6 +45,7 @@ The CMakeLists.txt file has a number of options you can pass:
   - `USEARCH_BUILD_BENCH_CPP` - build the C++ benchmark suite
   - `USEARCH_BUILD_LIB_C` - build the C library
   - `USEARCH_BUILD_TEST_C` - build the C test suite
+  - `USEARCH_BUILD_SQLITE` - build the SQLite extension
 - Which dependencies to use:
   - `USEARCH_USE_OPENMP` - use OpenMP for parallelism
   - `USEARCH_USE_SIMSIMD` - use SimSIMD for vectorization
@@ -66,6 +67,7 @@ cmake \
     -DUSEARCH_BUILD_BENCH_CPP=1 \
     -DUSEARCH_BUILD_LIB_C=1 \
     -DUSEARCH_BUILD_TEST_C=1 \
+    -DUSEARCH_BUILD_SQLITE=1 \
     -B ./build_release
 
 cmake --build ./build_release --config Release

sqlite/CMakeLists.txt

@@ -0,0 +1,23 @@
+# This article discusses a better way to allow building either static or shared libraries:
+# https://alexreinking.com/blog/building-a-dual-shared-and-static-library-with-cmake.html
+if (USEARCH_BUILD_SQLITE)
+    find_package(SQLite3 REQUIRED)
+
+    add_library(usearch_sqlite STATIC lib.cpp)
+
+    # Set the compile options for the static library
+    if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+        target_compile_options(usearch_sqlite PRIVATE -static-libstdc++)
+    elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+        target_compile_options(usearch_sqlite PRIVATE -static)
+    endif ()
+
+    target_link_libraries(usearch_sqlite PRIVATE SQLite::SQLite3)
+    target_include_directories(usearch_sqlite PRIVATE ${SQLite3_INCLUDE_DIRS})
+
+    target_include_directories(usearch_sqlite PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/../stringzilla/include)
+    target_compile_options(usearch_sqlite PRIVATE -fPIC)
+    target_compile_options(usearch_sqlite PRIVATE -Wno-vla -Wno-unused-function -Wno-cast-function-type)
+    setup_target(usearch_sqlite)
+
+endif ()

sqlite/lib.cpp

@@ -260,6 +260,7 @@ extern "C" SZ_DYNAMIC int sqlite3_compiled_init( //
 
     int flags = SQLITE_UTF8 | SQLITE_DETERMINISTIC | SQLITE_INNOCUOUS;
     int num_params = -1; // Any number will be accepted
+    (void)error_message; // Unused
 
     // String similarity metrics
     sqlite3_create_function(db, "distance_levenshtein_bytes", num_params, flags, NULL,