moving champ build process to a separate CMakeLists.txt file

Author: ye11owSub

CMakeLists.txt

@@ -29,3 +29,5 @@ target_link_libraries(${TARGET_NAME}
 )
 
 target_compile_definitions(${TARGET_NAME} PUBLIC ${ALL_DEF})
+
+add_subdirectory(contrib/champ)

contrib/champ/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.13)
+
+set(CHEMPY_PROJECT_NAME chempy.champ._champ)
+set(CMAKE_VERBOSE_MAKEFILE on)
+
+project(${CHEMPY_PROJECT_NAME} LANGUAGES C)
+
+find_package(Python REQUIRED COMPONENTS Interpreter Development)
+
+file(GLOB_RECURSE SOURCES "src/*.c")
+add_library(${CHEMPY_PROJECT_NAME} MODULE ${SOURCES})
+
+target_include_directories(${CHEMPY_PROJECT_NAME} PUBLIC
+    ${Python_INCLUDE_DIRS}
+    include
+)
+set_target_properties(${CHEMPY_PROJECT_NAME} PROPERTIES
+    PREFIX ""
+    SUFFIX "${Python_MODULE_EXTENSION}"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CHEMPY_PROJECT_NAME}"
+)
+target_compile_features(${CHEMPY_PROJECT_NAME} PRIVATE cxx_std_17)