From 5a6c2baadbc16fc2099a6951e389b9bd3cad08f6 Mon Sep 17 00:00:00 2001
From: lujinwangnv <143145775+lujinwangnv@users.noreply.github.com>
Date: Fri, 9 May 2025 18:01:22 -0700
Subject: Update build to allow setting more external paths (#7044)

* Update build to allow setting more external paths

Update the build to allow setting user-specific paths for the external
modules: glm, imgui, slang-rhi, and tinyobjloader.
---
 external/CMakeLists.txt | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

(limited to 'external')

diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index afab86a9d..55d9e4941 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -157,11 +157,19 @@ endif()
 
 # imgui
 add_library(imgui INTERFACE)
-target_include_directories(
-    imgui
-    ${system}
-    INTERFACE "${CMAKE_CURRENT_LIST_DIR}/imgui"
-)
+if(NOT SLANG_OVERRIDE_IMGUI_PATH)
+    target_include_directories(
+        imgui
+        ${system}
+        INTERFACE "${CMAKE_CURRENT_LIST_DIR}/imgui"
+    )
+else()
+    target_include_directories(
+        imgui
+        ${system}
+        INTERFACE "${SLANG_OVERRIDE_IMGUI_PATH}"
+    )
+endif()
 
 # stb
 add_library(stb INTERFACE)
@@ -196,7 +204,16 @@ if(SLANG_ENABLE_SLANG_RHI)
         set(SLANG_RHI_ENABLE_D3D11 OFF)
         set(SLANG_RHI_ENABLE_D3D12 OFF)
     endif()
-    add_subdirectory(slang-rhi)
+    if(NOT SLANG_OVERRIDE_SLANG_RHI_PATH)
+        add_subdirectory(slang-rhi)
+    else()
+        add_subdirectory(
+            ${SLANG_OVERRIDE_SLANG_RHI_PATH}
+            slang-rhi
+            EXCLUDE_FROM_ALL
+            ${system}
+        )
+    endif()
 endif()
 
 # Tidy things up:
-- 
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