[clangd] add cmake files and guide for clangd usage

.clangd

@@ -1,2 +1,2 @@
 CompileFlags:
-    Add: [-std=c23]
+  CompilationDatabase: build

.gitignore

@@ -86,3 +86,5 @@ dkms.conf
 *.out
 *.app
 
+.cache/
+build/

CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.20)
+project(pracitces)
+
+set(CMAKE_C_STANDARD 23)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(GLOBAL_INCLUDES ${CMAKE_SOURCE_DIR}/include)
+
+add_subdirectory(practice-1)

README.md

@@ -1,3 +1,13 @@
 # practices
-
 Repository with code from practice sessions
+
+# Clangd
+First, build the project to generate `compile_commands.json`:
+```bash
+cmake -B build
+```
+Then tell clangd where to find it by adding to `.clangd`:
+```yaml
+CompileFlags:
+  CompilationDatabase: build
+```

include/add.h

@@ -0,0 +1,3 @@
+#include <stdint.h>
+
+int32_t add(int32_t a, int32_t b);

practice-1/CMakeLists.txt

@@ -0,0 +1,2 @@
+add_executable(practice-1 main.c)
+target_include_directories(practice-1 PRIVATE ${GLOBAL_INCLUDES})

practice-1/main.c

@@ -1,5 +1,5 @@
-#include <stdio.h>
 #include <stdint.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 struct my_perfect_float
@@ -32,7 +32,6 @@ struct dm
 	int32_t mod;
 };
 
-
 int divmod(int32_t x, int32_t y, struct dm* dm)
 {
 	int aa = 2;	   // initialization
@@ -47,7 +46,7 @@ int divmod(int32_t x, int32_t y, struct dm* dm)
 }
 
 // x, y => /, %
-struct dm divmod(int32_t x, int32_t y, int *error_code)
+struct dm divmod(int32_t x, int32_t y, int* error_code)
 {
 	int aa = 2;	   // initialization
 	aa = 3;		   // assignment
@@ -55,10 +54,10 @@ struct dm divmod(int32_t x, int32_t y, int *error_code)
 	if (y == 0)
 	{
 		*error_code = 1;
-    return (struct dm) { .div = 0, .mod = 0 };
+		return (struct dm){ .div = 0, .mod = 0 };
 	}
-  //struct dm dm = { .div = x / y, .mod = x % y };
-  //return dm;
+	// struct dm dm = { .div = x / y, .mod = x % y };
+	// return dm;
 	return (struct dm){ .div = x / y, .mod = x % y };	 // compound literal
 }