Add kernel. Link everything

nob.c

@@ -61,6 +61,40 @@ bool build_c(Nob_Cmd *cmd) {
     return true;
 }
 
+bool link_everything(Nob_Cmd *cmd) {
+    Nob_File_Paths objectFiles = {0};
+    nob_da_append(&objectFiles, BUILD_FOLDER "kernel.o");
+    nob_da_append(&objectFiles, BUILD_FOLDER "boot.o");
+    nob_cmd_append(cmd,
+                   "i686-elf-gcc",
+                   "-T", SRC_FOLDER "linker.ld",
+                   "-o", BUILD_FOLDER "kernel",
+                   "-ffreestanding",
+                   "-O2",
+                   "-nostdlib");
+
+    for (size_t i = 0; i < objectFiles.count; ++i) {
+        nob_cmd_append(cmd, objectFiles.items[i]);
+    }
+
+    nob_cmd_append(cmd, "-lgcc");
+    if (!nob_cmd_run(cmd))
+        return false;
+
+    return true;
+}
+
+bool check_kernel(Nob_Cmd *cmd) {
+    nob_cmd_append(cmd, "grub-file", "--is-x86-multiboot", BUILD_FOLDER "kernel");
+    if (!nob_cmd_run(cmd))
+        return false;
+
+    return true;
+}
+
+bool clean_build() {
+}
+
 int main(int argc, char **argv) {
     NOB_GO_REBUILD_URSELF(argc, argv);
 
@@ -71,10 +105,15 @@ int main(int argc, char **argv) {
 
     if (!render_clangd_config())
         return 1;
+
     if (!build_assembly(&cmd))
         return 1;
     if (!build_c(&cmd))
         return 1;
+    if (!link_everything(&cmd))
+        return 1;
+    if (!check_kernel(&cmd))
+        return 1;
 
     return 0;
 }