kbuild.jinja2: Add olddefconfig step to build

As sometimes defconfig and fragments might miss some options,
we need to make sure at compile time config process wont restart
and try to ask questions by using olddefconfig.

Signed-off-by: Denys Fedoryshchenko <[email protected]>

config/runtime/kbuild.jinja2

@@ -101,6 +101,16 @@ class Config:
                 print(f"[_merge_frags] Failed to merge fragment")
             print(f"[_merge_frags] Merging fragment done")
             os.remove(f"/tmp/{i}.config")
+
+    def olddefconfig(self, srcdir):
+        cwd = os.getcwd()
+        os.chdir(srcdir)
+        print(f"[_olddefconfig] Running olddefconfig")
+        cmd = f"make ARCH=x86_64 olddefconfig"
+        ret = subprocess.run(cmd, shell=True).returncode
+        if ret != 0:
+            print(f"[_olddefconfig] Failed to run olddefconfig")
+        print(f"[_olddefconfig] Running olddefconfig done")
 
     # TODO(nuclearcat): ChromeOS should have its own config as "defconfig"
     def cros_config(self, config):
@@ -231,6 +241,7 @@ echo '# {command}' | tee -a {job_log}
                 if fwdir:
                     cfg.add_option(f'CONFIG_EXTRA_FIRMWARE_DIR="{fwdir}"')
                 cfg.merge_frags(src_path)
+                cfg.olddefconfig(src_path)
 
         print(f"[_run] Uploading artifacts")
         artifacts = self._upload_artifacts(local_artifacts)