From b50d311b66ec0a7f7122767a8363c896805c2df6 Mon Sep 17 00:00:00 2001
From: Lukas Lipp <15105596+fknfilewalker@users.noreply.github.com>
Date: Fri, 16 Feb 2024 06:15:18 +0100
Subject: cmake: option to build a static library version of slang (#3578)

* cmake: slang lib type setting

* cmake: change name for slang lib type setting

---------

Co-authored-by: Yong He <yonghe@outlook.com>
---
 CMakeLists.txt              | 12 ++++++++++++
 cmake/SlangTarget.cmake     |  7 +++++++
 docs/building.md            |  1 +
 source/slang/CMakeLists.txt |  2 +-
 4 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a295e81a4..8b5683c15 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -95,6 +95,18 @@ option(SLANG_ENABLE_SLANG_GLSLANG "Enable glslang dependency and slang-glslang w
 option(SLANG_ENABLE_TESTS "Enable test targets, requires SLANG_ENABLE_GFX, SLANG_ENABLE_SLANGD and SLANG_ENABLE_SLANGRT" ON)
 option(SLANG_ENABLE_EXAMPLES "Enable example targets, requires SLANG_ENABLE_GFX" ON)
 
+enum_option(
+    SLANG_LIB_TYPE 
+    # Default
+    SHARED
+    "How to build the slang lib:"
+    # Options
+    SHARED
+    "Build slang as a shared library (default)"
+    STATIC
+    "Build slang as a static library"
+)
+
 set(SLANG_GENERATORS_PATH
     ""
     CACHE PATH
diff --git a/cmake/SlangTarget.cmake b/cmake/SlangTarget.cmake
index 44d6c945c..cb4443d0e 100644
--- a/cmake/SlangTarget.cmake
+++ b/cmake/SlangTarget.cmake
@@ -241,6 +241,13 @@ function(slang_add_target dir type)
                 PUBLIC "${ARG_EXPORT_MACRO_PREFIX}_DYNAMIC"
                 PRIVATE "${ARG_EXPORT_MACRO_PREFIX}_DYNAMIC_EXPORT"
             )
+        elseif(
+            target_type STREQUAL STATIC_LIBRARY
+        )
+            target_compile_definitions(
+                ${target}
+                PUBLIC "${ARG_EXPORT_MACRO_PREFIX}_STATIC"
+            )
         endif()
     endif()
 
diff --git a/docs/building.md b/docs/building.md
index 3cac636a1..89ee9a998 100644
--- a/docs/building.md
+++ b/docs/building.md
@@ -260,6 +260,7 @@ See the [documentation on testing](../tools/slang-test/README.md) for more infor
 | `SLANG_ENABLE_SLANG_GLSLANG`      | `TRUE`           | Enable glslang dependency and slang-glslang wrapper target         |
 | `SLANG_ENABLE_TESTS`              | `TRUE`           | Enable test targets, requires SLANG_ENABLE_GFX, SLANG_ENABLE_SLANGD and SLANG_ENABLE_SLANGRT |
 | `SLANG_ENABLE_EXAMPLES`           | `TRUE`           | Enable example targets, requires SLANG_ENABLE_GFX                  |
+| `SLANG_LIB_TYPE`                  | `SHARED`         | How to build the slang library                                     |
 | `SLANG_SLANG_LLVM_FLAVOR`         | `FETCH_BINARY`   | How to set up llvm support                                         |
 | `SLANG_SLANG_LLVM_BINARY_URL`     | System dependent | URL specifying the location of the slang-llvm prebuilt library     |
 | `SLANG_GENERATORS_PATH`           | ``               | Path to an installed `all-generators` target for cross compilation |
diff --git a/source/slang/CMakeLists.txt b/source/slang/CMakeLists.txt
index cbec1c793..320cd0ce9 100644
--- a/source/slang/CMakeLists.txt
+++ b/source/slang/CMakeLists.txt
@@ -243,7 +243,7 @@ target_include_directories(
 #
 slang_add_target(
     .
-    SHARED
+    ${SLANG_LIB_TYPE}
     LINK_WITH_PRIVATE
         core
         compiler-core
-- 
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