From cc45f309d95779079ea25e5a9f99c97f95547960 Mon Sep 17 00:00:00 2001
From: Jinsun Yoo <jinsunyoo332@gmail.com>
Date: Tue, 11 Nov 2025 17:36:30 +0000
Subject: [PATCH] Import submodules through FetchContent

---
 CMakeLists.txt      | 10 ++++++++--
 extern/googletest   |  1 -
 extern/yaml-cpp     |  1 -
 test/CMakeLists.txt |  8 +++++++-
 4 files changed, 15 insertions(+), 5 deletions(-)
 delete mode 160000 extern/googletest
 delete mode 160000 extern/yaml-cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 80b1c10..f0f308f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,8 +19,14 @@ set(BUILDTARGET "all" CACHE STRING "Compilation target ([all]/congestion_unaware
 # Can be compiled into either library or executable
 option(NETWORK_BACKEND_BUILD_AS_LIBRARY "Build as a library" OFF)
 
-# Compile external libraries
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/extern/yaml-cpp yaml-cpp)
+# Add external libraries
+include(FetchContent)
+FetchContent_Declare(
+    yaml-cpp
+    GIT_REPOSITORY https://github.com/jbeder/yaml-cpp.git
+    GIT_TAG a83cd31 # Current as of 2025-10-01
+)
+FetchContent_MakeAvailable(yaml-cpp)
 
 # Include src files to compile
 file(GLOB srcs_common
diff --git a/extern/googletest b/extern/googletest
deleted file mode 160000
index 1204d63..0000000
--- a/extern/googletest
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 1204d634444b0ba6da53201a8b6caf2a502d883c
diff --git a/extern/yaml-cpp b/extern/yaml-cpp
deleted file mode 160000
index 3d2888c..0000000
--- a/extern/yaml-cpp
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 3d2888cc8a45da2f420454ad728cdfad01a3d54f
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index f4f7a02..b1695ff 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -19,7 +19,13 @@ option(NETWORK_BACKEND_BUILD_AS_LIBRARY "Build as a library" ON)
 add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/.. analytical)
 
 # Compile GoogleTest
-add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/../extern/googletest googletest)
+include(FetchContent)
+FetchContent_Declare(
+    googletest
+    GIT_REPOSITORY https://github.com/google/googletest.git
+    GIT_TAG 1204d63 # Commit of 2024-10-31
+)
+FetchContent_MakeAvailable(googletest)
 include(GoogleTest)
 
 # Compile Congestion Unaware Backend