From 7e20337ae5ee77db50f7a47992dfe39ff1fa4a00 Mon Sep 17 00:00:00 2001
From: Jeremy Schonfeld <jschonfeld@apple.com>
Date: Thu, 8 Aug 2024 10:58:25 -0700
Subject: [PATCH 1/4] Enable whole-module-optimization for release builds

---
 CMakeLists.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index edb6cf06f9..5c35718c86 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -185,6 +185,13 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android")
         "-D_GNU_SOURCE")
 endif()
 
+# Enable whole module optimization for release builds & incremental for debug builds
+if(POLICY CMP0157)
+    set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
+else()
+    add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<IF:$<CONFIG:Release>>>:-wmo>)
+endif()
+
 include(GNUInstallDirs)
 include(FoundationSwiftSupport)
 

From 0cca2f1fd4984dac5aa9853b9608c2a1ad22e189 Mon Sep 17 00:00:00 2001
From: Jeremy Schonfeld <jschonfeld@apple.com>
Date: Thu, 8 Aug 2024 11:22:14 -0700
Subject: [PATCH 2/4] Address feedback

---
 CMakeLists.txt | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5c35718c86..54f40901bb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,13 @@ if(NOT SWIFT_SYSTEM_NAME)
   endif()
 endif()
 
+# Enable whole module optimization for release builds & incremental for debug builds
+if(POLICY CMP0157)
+    set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
+else()
+    add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<IF:$<CONFIG:Release>>>:-wmo>)
+endif()
+
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
@@ -185,13 +192,6 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android")
         "-D_GNU_SOURCE")
 endif()
 
-# Enable whole module optimization for release builds & incremental for debug builds
-if(POLICY CMP0157)
-    set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
-else()
-    add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<IF:$<CONFIG:Release>>>:-wmo>)
-endif()
-
 include(GNUInstallDirs)
 include(FoundationSwiftSupport)
 

From a99ecc235a22e966e7859f5d51c1f5172bb5a6f6 Mon Sep 17 00:00:00 2001
From: Jeremy Schonfeld <jschonfeld@apple.com>
Date: Thu, 8 Aug 2024 15:52:20 -0700
Subject: [PATCH 3/4] Fix build failures

---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 54f40901bb..772ba0d85d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,7 +45,7 @@ endif()
 if(POLICY CMP0157)
     set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
 else()
-    add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<IF:$<CONFIG:Release>>>:-wmo>)
+    add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<CONFIG:Release>>:-wmo>)
 endif()
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)

From e20e3adddd181b076ae3c79d86ecf65ec80bed8b Mon Sep 17 00:00:00 2001
From: Jeremy Schonfeld <jschonfeld@apple.com>
Date: Fri, 9 Aug 2024 09:29:56 -0700
Subject: [PATCH 4/4] Don't enable WMO on Windows

---
 CMakeLists.txt | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 772ba0d85d..5e28bbf327 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,11 +41,14 @@ if(NOT SWIFT_SYSTEM_NAME)
   endif()
 endif()
 
-# Enable whole module optimization for release builds & incremental for debug builds
-if(POLICY CMP0157)
-    set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
-else()
-    add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<CONFIG:Release>>:-wmo>)
+# Don't enable WMO on Windows due to linker failures
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Windows)
+    # Enable whole module optimization for release builds & incremental for debug builds
+    if(POLICY CMP0157)
+        set(CMAKE_Swift_COMPILATION_MODE "$<IF:$<CONFIG:Release>,wholemodule,incremental>")
+    else()
+        add_compile_options($<$<AND:$<COMPILE_LANGUAGE:Swift>,$<CONFIG:Release>>:-wmo>)
+    endif()
 endif()
 
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)