Export "compile_commands.json" for clangd (#8)

Author: AllanZyne

Diff for: .gitignore

@@ -133,3 +133,6 @@ dmypy.json
 
 # emacs
 *~
+
+# clangd
+/compile_commands.json

Diff for: setup.py

@@ -32,6 +32,7 @@ def build_cmake(self, ext):
             f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir.parent.absolute()}",
             f"-DCMAKE_BUILD_TYPE={config}",
             "-DCMAKE_VERBOSE_MAKEFILE=ON",
+            "-DCMAKE_EXPORT_COMPILE_COMMANDS=1",
             "-G=Ninja",
             "-DLLVM_ENABLE_LLD=ON",
             f"-DCMAKE_PREFIX_PATH={os.getenv('CONDA_PREFIX')}/lib/cmake",