From 9d7d943db47dd7805a710431cf7eedc0bec8ecc7 Mon Sep 17 00:00:00 2001
From: jarcherNV <jarcher@nvidia.com>
Date: Thu, 6 Mar 2025 19:16:27 -0800
Subject: Update build to allow setting external paths (#6528)

* Update build to allow setting external paths

Update the build to allow setting user-specific paths for the external modules.
This allows building Slang without also fetching the external modules, assuming
they are already present elsewhere locally.
---
 CMakeLists.txt | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'CMakeLists.txt')

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 48d263d14..a74047e0f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,6 +166,43 @@ option(
 )
 mark_as_advanced(SLANG_SPIRV_HEADERS_INCLUDE_DIR)
 
+# Options for user defined paths for external modules.
+advanced_option(
+    SLANG_OVERRIDE_LZ4_PATH
+    "Build using user defined path for LZ4"
+    OFF
+)
+advanced_option(
+    SLANG_OVERRIDE_MINIZ_PATH
+    "Build using user defined path for Miniz"
+    OFF
+)
+advanced_option(
+    SLANG_OVERRIDE_UNORDERED_DENSE_PATH
+    "Build using user defined path for unordered_dense"
+    OFF
+)
+advanced_option(
+    SLANG_OVERRIDE_VULKAN_HEADERS_PATH
+    "Build using user defined path for Vulkan headers"
+    OFF
+)
+advanced_option(
+    SLANG_OVERRIDE_SPIRV_HEADERS_PATH
+    "Build using user defined path for SPIR-V headers"
+    OFF
+)
+advanced_option(
+    SLANG_OVERRIDE_SPIRV_TOOLS_PATH
+    "Build using user defined path for SPIR-V tools"
+    OFF
+)
+advanced_option(
+    SLANG_OVERRIDE_GLSLANG_PATH
+    "Build using user defined path for glslang, this also requires "
+    OFF
+)
+
 if(${SLANG_USE_SYSTEM_LZ4})
     add_compile_definitions(SLANG_USE_SYSTEM_LZ4_HEADER)
 endif()
@@ -178,6 +215,10 @@ if(${SLANG_USE_SYSTEM_UNORDERED_DENSE})
     add_compile_definitions(SLANG_USE_SYSTEM_UNORDERED_DENSE_HEADER)
 endif()
 
+if(SLANG_OVERRIDE_SPIRV_HEADERS_PATH)
+    add_compile_definitions(SLANG_USE_SYSTEM_SPIRV_HEADER)
+endif()
+
 enum_option(
     SLANG_LIB_TYPE
     # Default
-- 
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