build: optimize cmake structure

src/core/CMakeLists.txt

@@ -1,9 +1,9 @@
 cmake_minimum_required(VERSION 3.12)
-project(core VERSION 0.0.1 LANGUAGES CXX)
+project(klotski_core VERSION 0.0.1 LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 23)
 
-set(KLOTSKI_CORE_SRC
+set(KLSK_CORE_SRC
     ranges/internal/spawn.cc
     ranges/internal/ranges.cc
     ranges/internal/derive.cc
@@ -31,16 +31,15 @@ set(KLOTSKI_CORE_SRC
     fast_cal/internal/fast_cal.cc
 )
 
-add_library(klotski_core STATIC ${KLOTSKI_CORE_SRC})
+add_library(klotski_core STATIC ${KLSK_CORE_SRC})
 target_compile_options(klotski_core PRIVATE -fno-rtti -fno-exceptions)  # option for `-fvisibility=hidden`
 target_include_directories(klotski_core PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
 target_link_libraries(klotski_core PUBLIC phmap::phmap)
 add_library(klotski::core ALIAS klotski_core)
 
-# TODO: just for dev testing
 if (KLSK_DEV_MODE)
   add_executable(klotski_core_bin main.cc)
-  target_link_libraries(klotski_core_bin PRIVATE klotski_core)
+  target_link_libraries(klotski_core_bin PRIVATE klotski::core)
 endif()
 
 if (KLSK_ENABLE_BENCHMARK)

src/core_ffi/CMakeLists.txt

@@ -1,31 +1,14 @@
 cmake_minimum_required(VERSION 3.12)
 project(core_ffi)
 
-set(CMAKE_CXX_STANDARD 23)
-
 if (KLSK_C_FFI)
-  add_library(klotski_c c_ffi/all_cases.cc)
-  target_include_directories(klotski_c PUBLIC c_ffi/include)
-  target_link_libraries(klotski_c PRIVATE klotski::core)
-  set_target_properties(klotski_c PROPERTIES OUTPUT_NAME klotski)
+  add_subdirectory(c_ffi)
 endif()
 
-if (KLSK_PYTHON_FFI)
-    add_subdirectory(py_ffi)
+if (KLSK_RUST_FFI)
+  add_subdirectory(rust_ffi)
 endif()
 
-if (KLSK_RUST_FFI)
-  if (CARGO_BUILD)
-    install(TARGETS klotski_core DESTINATION .)
-  else()
-    # just for IDE highlight
-    add_library(klotski_rs
-      rust_ffi/adapter/short_code.cc
-      rust_ffi/adapter/common_code.cc
-      rust_ffi/target/cxxbridge/rust_ffi/src/bridge.rs.cc
-    )
-    target_include_directories(klotski_rs PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
-    target_include_directories(klotski_rs PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/rust_ffi/target/cxxbridge)
-    target_link_libraries(klotski_rs PRIVATE klotski_core)
-  endif()
+if (KLSK_PYTHON_FFI)
+  add_subdirectory(python_ffi)
 endif()

src/core_ffi/c_ffi/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.12)
+project(klotski_c LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+
+set(KLSK_C_FFI_SRC
+    all_cases.cc
+)
+
+# TODO: add `-fno-rtti -fno-exceptions -fvisibility=hidden`
+add_library(klotski_c STATIC ${KLSK_C_FFI_SRC})  # TODO: allow shared lib
+target_include_directories(klotski_c PUBLIC include)
+target_link_libraries(klotski_c PRIVATE klotski::core)
+
+set_target_properties(klotski_c PROPERTIES OUTPUT_NAME klotski)
+add_library(klotski::c_ffi ALIAS klotski_c)

src/core_ffi/py_ffi/CMakeLists.txt → src/core_ffi/python_ffi/CMakeLists.txt

@@ -1,9 +1,9 @@
 cmake_minimum_required(VERSION 3.12)
-project(py_ffi)
+project(klotski_py LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 23)
 
-pybind11_add_module(klotski_py
+set(KLSK_PYTHON_FFI_SRC
     klotski.cc
 
     binder/cases.cc
@@ -20,9 +20,13 @@ pybind11_add_module(klotski_py
     wrapper/group.cc
     wrapper/fast_cal.cc
 )
+
+pybind11_add_module(klotski_py ${KLSK_PYTHON_FFI_SRC})
 target_include_directories(klotski_py PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/include)
 target_link_libraries(klotski_py PRIVATE klotski::core)
+
 set_target_properties(klotski_py PROPERTIES OUTPUT_NAME _klotski)
+add_library(klotski::py_ffi ALIAS klotski_py)
 
 if (SKBUILD)
   install(TARGETS klotski_py DESTINATION .)

src/core_ffi/py_ffi/packing/MANIFEST.in → src/core_ffi/python_ffi/packing/MANIFEST.in

@@ -10,8 +10,8 @@ include src/CMakeLists.txt
 include src/core_ffi/CMakeLists.txt
 
 recursive-include src/core *
-recursive-include src/core_ffi/py_ffi *
-recursive-exclude src/core_ffi/py_ffi/packing *
+recursive-include src/core_ffi/python_ffi *
+recursive-exclude src/core_ffi/python_ffi/packing *
 
 include third_party/ThirdParty.cmake
 recursive-include third_party/pybind11 *

src/core_ffi/rust_ffi/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.12)
+project(klotski_rs LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+
+if (KLSK_DEV_MODE)
+  set(KLSK_RUST_FFI_SRC
+      adapter/short_code.cc
+      adapter/common_code.cc
+      target/cxxbridge/rust_ffi/src/bridge.rs.cc
+  )
+  add_library(klotski_rs STATIC ${KLSK_RUST_FFI_SRC}) # just for IDE highlight
+  target_include_directories(klotski_rs PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../)
+  target_include_directories(klotski_rs PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/target/cxxbridge)
+  target_link_libraries(klotski_rs PRIVATE klotski::core)
+
+  set_target_properties(klotski_rs PROPERTIES OUTPUT_NAME klotski)
+  add_library(klotski::rs_ffi ALIAS klotski_rs)
+endif()
+
+if (CARGO_BUILD)
+  install(TARGETS klotski_core DESTINATION .)
+endif()

src/core_ffi/rust_ffi/build.rs

@@ -1,27 +1,23 @@
-extern crate cmake;
+// NOTE: add the following environment variables for using llvm toolchain
+//         CC=clang-20
+//         CXX=clang++-20
+//         CXXSTDLIB="c++"
+//         CXXFLAGS="-stdlib=libc++"
+//         RUSTFLAGS="-Clinker=clang-20 -Clink-arg=-fuse-ld=lld-20 -Clink-arg=-stdlib=libc++"
 
 use cxx_build::CFG;
 
-// NOTE: add `CC=clang-20 CXX=clang++-20 CXXFLAGS="-stdlib=libc++"` for cargo command
-//       we should keep cxx crate using clang for `cxx.cc`
-
-// NOTE: also, `RUSTFLAGS="-C linker=clang-20"` should be added to cargo env for using lld
-
-// NOTE: add `CC=clang-20 CXX=clang++-20 CXXFLAGS="-stdlib=libc++" RUSTFLAGS="-C linker=clang-20 -C link-arg=-fuse-ld=lld-20 -C link-arg=-stdlib=libc++"` for using llvm toolchain
-
-// NOTE: it seems that cxx_build link `libstdc++` on linux, we can add `-C link-arg=-lc++ -C link-arg=-lc++abi` for workaround, but it should be fixed in the future.
-
 fn main() {
-    let dst = cmake::Config::new("klotski")
+    cmake::Config::new("klotski")
         .define("CARGO_BUILD:BOOL", "ON")
         .define("KLSK_ENABLE_TESTING:BOOL", "OFF")
         .define("KLSK_ENABLE_BENCHMARK:BOOL", "OFF")
         .define("KLSK_C_FFI:BOOL", "OFF")
         .define("KLSK_PYTHON_FFI:BOOL", "OFF")
         .build();
+    println!("cargo:rustc-link-lib=static=klotski_core");
 
     CFG.include_prefix = "rust_ffi";
-
     cxx_build::bridge("src/bridge.rs")
         .file("adapter/short_code.cc")
         .file("adapter/common_code.cc")
@@ -31,9 +27,6 @@ fn main() {
         .flag("-fno-exceptions")
         .compile("klotski");
 
-    println!("cargo:rustc-link-search=native={}", dst.display());
-    println!("cargo:rustc-link-lib=static=klotski_core");
-
     println!("cargo:rerun-if-changed=src/bridge.rs");
     println!("cargo:rerun-if-changed=adapter/short_code.cc");
     println!("cargo:rerun-if-changed=adapter/common_code.cc");

src/core_ffi/rust_ffi/klotski/src/core_ffi/rust_ffi/CMakeLists.txt

@@ -0,0 +1 @@
+../../../../CMakeLists.txt

src/core_test/CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
-project(core-test LANGUAGES CXX)
+project(klotski_test LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 23)