[FL-2052] New build system based on scons (#1269)

site_scons/site_tools/fbt_extapps.py

@@ -0,0 +1,30 @@
+import os
+
+
+def BuildAppElf(env, app):
+    work_dir = env.subst("$EXT_APPS_WORK_DIR")
+    app_target_name = os.path.join(work_dir, app.appid)
+    app_alias = f"{env['FIRMWARE_BUILD_CFG']}_{app.appid}"
+    app_elf = env.Program(
+        app_target_name,
+        env.GlobRecursive("*.c*", os.path.join(work_dir, app._appdir)),
+        APP_ENTRY=app.entry_point,
+    )
+    app_elf_dump = env.ObjDump(app_target_name)
+    env.Alias(f"{app_alias}_list", app_elf_dump)
+
+    app_stripped_elf = env.ELFStripper(
+        os.path.join(env.subst("$PLUGIN_ELF_DIR"), app.appid), app_elf
+    )
+    env.Alias(app_alias, app_stripped_elf)
+    return app_stripped_elf
+
+
+def generate(env, **kw):
+    env.SetDefault(EXT_APPS_WORK_DIR=kw.get("EXT_APPS_WORK_DIR", ".extapps"))
+    env.VariantDir(env.subst("$EXT_APPS_WORK_DIR"), ".", duplicate=False)
+    env.AddMethod(BuildAppElf)
+
+
+def exists(env):
+    return True