Add CMake option SQLITE_ENABLE_RTREE to enable RTree extension when building internal sqlite3 library

See more here: https://sqlite.org/rtree.html

Disabled by default

Author: SRombauts

CMakeLists.txt

@@ -253,6 +253,7 @@ option(SQLITECPP_INTERNAL_SQLITE "Add the internal SQLite3 source to the project
 if (SQLITECPP_INTERNAL_SQLITE)
     message(STATUS "Compile sqlite3 from source in subdirectory")
     option(SQLITE_ENABLE_JSON1 "Enable JSON1 extension when building internal sqlite3 library." ON)
+    option(SQLITE_ENABLE_RTREE "Enable RTree extension when building internal sqlite3 library." OFF)
     # build the SQLite3 C library (for ease of use/compatibility) versus Linux sqlite3-dev package
     add_subdirectory(sqlite3)
     target_link_libraries(SQLiteCpp PUBLIC SQLite::SQLite3)

sqlite3/CMakeLists.txt

@@ -36,10 +36,11 @@ if (SQLITE_ENABLE_JSON1)
     target_compile_definitions(sqlite3 PUBLIC SQLITE_ENABLE_JSON1)
 endif (SQLITE_ENABLE_JSON1)
 
-if(SQLITE_ENABLE_RTREE)
+if (SQLITE_ENABLE_RTREE)
     # Enable RTree extension when building sqlite3
     # See more here: https://sqlite.org/rtree.html
     target_compile_definitions(sqlite3 PUBLIC SQLITE_ENABLE_RTREE)
+    message(STATUS "Compile sqlite3 with SQLITE_ENABLE_RTREE")
 endif (SQLITE_ENABLE_RTREE)
 
 if (UNIX AND (CMAKE_COMPILER_IS_GNUCXX OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang"))