https://github.com/tstellar updated 
https://github.com/llvm/llvm-project/pull/200734

>From f75de69eaded84471f7eacd64636c30212818b2e Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Fri, 5 Jun 2026 13:46:27 -0700
Subject: [PATCH 01/13] Use wix

---
 clang/cmake/caches/Release.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
index b0bc3ebfe5cb6..ff65a83c7cf93 100644
--- a/clang/cmake/caches/Release.cmake
+++ b/clang/cmake/caches/Release.cmake
@@ -168,7 +168,11 @@ set_final_stage_var(LLVM_ENABLE_PROJECTS 
"${LLVM_RELEASE_ENABLE_PROJECTS}" STRIN
 if (${CMAKE_HOST_SYSTEM_NAME} MATCHES "Linux")
   set_final_stage_var(CLANG_BOLT "INSTRUMENT" STRING)
 endif()
+if (WIN32)
+set_final_stage_var(CPACK_GENERATOR "WIX" STRING)
+else()
 set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
+endif()
 set_final_stage_var(CPACK_ARCHIVE_THREADS "0" STRING)
 
 set_final_stage_var(LLVM_USE_STATIC_ZSTD "ON" BOOL)

>From 78b4d12dfd0faf0a350eb6c18e29c44e44710db0 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Thu, 4 Jun 2026 17:00:26 -0700
Subject: [PATCH 02/13] Dump NSIS log

---
 .github/workflows/release-binaries.yml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/.github/workflows/release-binaries.yml 
b/.github/workflows/release-binaries.yml
index 573ddfb43cdd7..5bbac29de5405 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -308,6 +308,12 @@ jobs:
         RELEASE_BINARY_FILENAME_ZSTD: ${{ 
needs.prepare.outputs.release-binary-filename-zstd }}
       run: |
         xz -dc "$RELEASE_BINARY_FILENAME" | zstd --ultra -22 -T0 -o 
"$RELEASE_BINARY_FILENAME_ZSTD"
+    - name: Dump Build logs
+      if: runner.os == 'Windows' && failure()
+      env:
+        LLVM_VERSION: ${{ needs.prepare.outputs.release-version }}
+      run: |
+        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:RUNNER_ARCH.ToLower())/_CPack_Packages/win64/NSIS/NSISOutput.log
 
     - name: Generate sha256 digest for binaries
       id: digest

>From ba320ef3348bb35678da4d5c9103e6bfa96ae544 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Fri, 5 Jun 2026 16:54:54 -0700
Subject: [PATCH 03/13] Debug

---
 .github/workflows/release-binaries-all.yml | 4 ----
 clang/cmake/caches/Release.cmake           | 4 ++--
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/release-binaries-all.yml 
b/.github/workflows/release-binaries-all.yml
index 3687de77e0156..45062cb9774b1 100644
--- a/.github/workflows/release-binaries-all.yml
+++ b/.github/workflows/release-binaries-all.yml
@@ -100,11 +100,7 @@ jobs:
         # We use ubuntu-22.04 rather than the latest version to make the built
         # binaries more portable (eg functional aginast older glibc).
         runs-on:
-          - ubuntu-22.04
-          - ubuntu-22.04-arm
-          - macos-14
           - windows-2022
-          - windows-11-arm
 
     uses: ./.github/workflows/release-binaries.yml
     with:
diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
index ff65a83c7cf93..46625a6e55b68 100644
--- a/clang/cmake/caches/Release.cmake
+++ b/clang/cmake/caches/Release.cmake
@@ -169,9 +169,9 @@ if (${CMAKE_HOST_SYSTEM_NAME} MATCHES "Linux")
   set_final_stage_var(CLANG_BOLT "INSTRUMENT" STRING)
 endif()
 if (WIN32)
-set_final_stage_var(CPACK_GENERATOR "WIX" STRING)
+  set_final_stage_var(CPACK_GENERATOR "WIX" STRING)
 else()
-set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
+  set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
 endif()
 set_final_stage_var(CPACK_ARCHIVE_THREADS "0" STRING)
 

>From 0baff50d2b7e30973400b83f61f0340104c0bdbe Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Fri, 5 Jun 2026 09:06:15 -0700
Subject: [PATCH 04/13] Fix log

---
 .github/workflows/release-binaries.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/release-binaries.yml 
b/.github/workflows/release-binaries.yml
index 5bbac29de5405..30887ff7cefb1 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -312,8 +312,9 @@ jobs:
       if: runner.os == 'Windows' && failure()
       env:
         LLVM_VERSION: ${{ needs.prepare.outputs.release-version }}
+        BUILD_DIR_SUFFIX: ${{ case(runner.arch == 'ARM64', 'arm64', 'amd64') }}
       run: |
-        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:RUNNER_ARCH.ToLower())/_CPack_Packages/win64/NSIS/NSISOutput.log
+        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/NSIS/NSISOutput.log
 
     - name: Generate sha256 digest for binaries
       id: digest

>From a2ac2fa9fc2dcda3986d3c27aa49f814b9d85043 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Fri, 5 Jun 2026 22:11:49 -0700
Subject: [PATCH 05/13] Use wix

---
 llvm/utils/release/build_llvm_release.bat | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/utils/release/build_llvm_release.bat 
b/llvm/utils/release/build_llvm_release.bat
index 0f6dbb36ad784..9a0f33f7862fc 100644
--- a/llvm/utils/release/build_llvm_release.bat
+++ b/llvm/utils/release/build_llvm_release.bat
@@ -188,6 +188,7 @@ set common_cmake_flags=^
   -DLLVM_ENABLE_RPMALLOC=ON ^
   -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld" ^
   -DLLVM_ENABLE_RUNTIMES="compiler-rt;openmp" ^
+  -DCPACK_GENERATOR="WIX" ^
   -DCOMPILER_RT_BUILD_ORC=OFF
 
 if "%force-msvc%" == "" (

>From f488f778a367fbd4caea25d982f712240bf89d00 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Sat, 6 Jun 2026 08:22:42 -0700
Subject: [PATCH 06/13] Add wix log

---
 .github/workflows/release-binaries.yml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/.github/workflows/release-binaries.yml 
b/.github/workflows/release-binaries.yml
index 30887ff7cefb1..32609d2288d7b 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -314,6 +314,7 @@ jobs:
         LLVM_VERSION: ${{ needs.prepare.outputs.release-version }}
         BUILD_DIR_SUFFIX: ${{ case(runner.arch == 'ARM64', 'arm64', 'amd64') }}
       run: |
+        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/WIX/wix.log
         cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/NSIS/NSISOutput.log
 
     - name: Generate sha256 digest for binaries

>From 39937c04181ed4a6af41e51ea322aae5946d1efe Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Sat, 6 Jun 2026 17:55:59 -0700
Subject: [PATCH 07/13] Disable sval

---
 clang/cmake/caches/Release.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
index 46625a6e55b68..385d2218e2d44 100644
--- a/clang/cmake/caches/Release.cmake
+++ b/clang/cmake/caches/Release.cmake
@@ -170,6 +170,7 @@ if (${CMAKE_HOST_SYSTEM_NAME} MATCHES "Linux")
 endif()
 if (WIN32)
   set_final_stage_var(CPACK_GENERATOR "WIX" STRING)
+  set_final_stage_var(CPACK_WIX_LIGHT_EXTRA_FLAGS "-sval" STRING)
 else()
   set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
 endif()

>From 610ed03e244bcc2023f82a70cdda7ebba58a5a57 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Sat, 6 Jun 2026 17:56:42 -0700
Subject: [PATCH 08/13] Fix wix

---
 llvm/utils/release/build_llvm_release.bat | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/utils/release/build_llvm_release.bat 
b/llvm/utils/release/build_llvm_release.bat
index 9a0f33f7862fc..94379261920c5 100644
--- a/llvm/utils/release/build_llvm_release.bat
+++ b/llvm/utils/release/build_llvm_release.bat
@@ -189,6 +189,7 @@ set common_cmake_flags=^
   -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld" ^
   -DLLVM_ENABLE_RUNTIMES="compiler-rt;openmp" ^
   -DCPACK_GENERATOR="WIX" ^
+  -DCPACK_WIX_LIGHT_EXTRA_FLAGS="-sval" ^
   -DCOMPILER_RT_BUILD_ORC=OFF
 
 if "%force-msvc%" == "" (

>From 0a79ae68fd16420da0f1412917f1bb008470f812 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Sun, 7 Jun 2026 12:23:07 -0700
Subject: [PATCH 09/13] Fix installer suffix

---
 .github/workflows/release-binaries.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/release-binaries.yml 
b/.github/workflows/release-binaries.yml
index 32609d2288d7b..9de8f015cfd6f 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -294,7 +294,7 @@ jobs:
         subst S: ${{ github.workspace }}
         cd S:\llvm\utils\release\
         .\build_llvm_release.bat "--$($env:RUNNER_ARCH.ToLower())" --version 
$env:LLVM_VERSION --local-python --skip-checkout
-        $installer = (Get-ChildItem -Recurse -Filter "*.exe" | Select-Object 
-First 1).fullName
+        $installer = (Get-ChildItem -Recurse -Filter "*.msi" | Select-Object 
-First 1).fullName
         $tarball = (Get-ChildItem -Recurse -Filter "*.tar.xz" | Select-Object 
-First 1).fullName
         # Move installer to top-level directory so it is easier to upload.
         mv $installer $env:GITHUB_WORKSPACE

>From 81118431d15151c3b47bf7666fcdab31b7928a1b Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Mon, 8 Jun 2026 17:26:07 -0700
Subject: [PATCH 10/13] Revert "Debug"

This reverts commit ba320ef3348bb35678da4d5c9103e6bfa96ae544.
---
 .github/workflows/release-binaries-all.yml | 4 ++++
 clang/cmake/caches/Release.cmake           | 7 +------
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/release-binaries-all.yml 
b/.github/workflows/release-binaries-all.yml
index 45062cb9774b1..3687de77e0156 100644
--- a/.github/workflows/release-binaries-all.yml
+++ b/.github/workflows/release-binaries-all.yml
@@ -100,7 +100,11 @@ jobs:
         # We use ubuntu-22.04 rather than the latest version to make the built
         # binaries more portable (eg functional aginast older glibc).
         runs-on:
+          - ubuntu-22.04
+          - ubuntu-22.04-arm
+          - macos-14
           - windows-2022
+          - windows-11-arm
 
     uses: ./.github/workflows/release-binaries.yml
     with:
diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
index 385d2218e2d44..b0bc3ebfe5cb6 100644
--- a/clang/cmake/caches/Release.cmake
+++ b/clang/cmake/caches/Release.cmake
@@ -168,12 +168,7 @@ set_final_stage_var(LLVM_ENABLE_PROJECTS 
"${LLVM_RELEASE_ENABLE_PROJECTS}" STRIN
 if (${CMAKE_HOST_SYSTEM_NAME} MATCHES "Linux")
   set_final_stage_var(CLANG_BOLT "INSTRUMENT" STRING)
 endif()
-if (WIN32)
-  set_final_stage_var(CPACK_GENERATOR "WIX" STRING)
-  set_final_stage_var(CPACK_WIX_LIGHT_EXTRA_FLAGS "-sval" STRING)
-else()
-  set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
-endif()
+set_final_stage_var(CPACK_GENERATOR "TXZ" STRING)
 set_final_stage_var(CPACK_ARCHIVE_THREADS "0" STRING)
 
 set_final_stage_var(LLVM_USE_STATIC_ZSTD "ON" BOOL)

>From f4ae7c531c825d82b693f0c1129dec6a8a0c8679 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Fri, 5 Jun 2026 09:06:15 -0700
Subject: [PATCH 11/13] Fix log

---
 .github/workflows/release-binaries.yml | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.github/workflows/release-binaries.yml 
b/.github/workflows/release-binaries.yml
index 9de8f015cfd6f..d43e14402dc14 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -315,7 +315,6 @@ jobs:
         BUILD_DIR_SUFFIX: ${{ case(runner.arch == 'ARM64', 'arm64', 'amd64') }}
       run: |
         cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/WIX/wix.log
-        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/NSIS/NSISOutput.log
 
     - name: Generate sha256 digest for binaries
       id: digest

>From 18d20cabd62184989125505eb5e520ef3bc60361 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Tue, 9 Jun 2026 09:42:54 -0700
Subject: [PATCH 12/13] Review changes

---
 .github/workflows/release-binaries.yml    | 15 ++++++++-------
 llvm/utils/release/build_llvm_release.bat |  1 -
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/.github/workflows/release-binaries.yml 
b/.github/workflows/release-binaries.yml
index d43e14402dc14..9cec8ed301aa9 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -300,6 +300,14 @@ jobs:
         mv $installer $env:GITHUB_WORKSPACE
         mv $tarball $env:GITHUB_WORKSPACE
         echo "windows-installer-filename=$(Split-Path -Path $installer -Leaf)" 
>> $env:GITHUB_OUTPUT
+    
+    - name: Dump Wix logs
+      if: runner.os == 'Windows'
+      env:
+        LLVM_VERSION: ${{ needs.prepare.outputs.release-version }}
+        BUILD_DIR_SUFFIX: ${{ case(runner.arch == 'ARM64', 'arm64', 'amd64') }}
+      run: |
+        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/WIX/wix.log
 
     - name: Create zstd compressed tarball
       shell: bash
@@ -308,13 +316,6 @@ jobs:
         RELEASE_BINARY_FILENAME_ZSTD: ${{ 
needs.prepare.outputs.release-binary-filename-zstd }}
       run: |
         xz -dc "$RELEASE_BINARY_FILENAME" | zstd --ultra -22 -T0 -o 
"$RELEASE_BINARY_FILENAME_ZSTD"
-    - name: Dump Build logs
-      if: runner.os == 'Windows' && failure()
-      env:
-        LLVM_VERSION: ${{ needs.prepare.outputs.release-version }}
-        BUILD_DIR_SUFFIX: ${{ case(runner.arch == 'ARM64', 'arm64', 'amd64') }}
-      run: |
-        cat 
S:/llvm/utils/release/llvm_package_$($env:LLVM_VERSION)/build_$($env:BUILD_DIR_SUFFIX)/_CPack_Packages/win64/WIX/wix.log
 
     - name: Generate sha256 digest for binaries
       id: digest
diff --git a/llvm/utils/release/build_llvm_release.bat 
b/llvm/utils/release/build_llvm_release.bat
index 94379261920c5..9eebd75d82dd8 100644
--- a/llvm/utils/release/build_llvm_release.bat
+++ b/llvm/utils/release/build_llvm_release.bat
@@ -85,7 +85,6 @@ if not "%version_7z%"=="" (
 REM Prerequisites:
 REM
 REM   Visual Studio 2019, CMake, Ninja, GNUWin32, SWIG, Python 3,
-REM   NSIS with the strlen_8192 patch,
 REM   Perl (for the OpenMP run-time).
 REM
 REM

>From 0d7268bb7fbde2c57eaa27787df65a64f04ec673 Mon Sep 17 00:00:00 2001
From: Tom Stellard <[email protected]>
Date: Wed, 10 Jun 2026 13:50:54 -0700
Subject: [PATCH 13/13] Move flags into llvm/CMakeLists.txt

---
 llvm/CMakeLists.txt                       | 23 +++++++++++++++--------
 llvm/utils/release/build_llvm_release.bat |  1 -
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index 4509fbaba1d25..ad69c4b719a3f 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -483,20 +483,27 @@ set(CPACK_PACKAGE_VERSION_PATCH ${LLVM_VERSION_PATCH})
 set(CPACK_PACKAGE_VERSION ${PACKAGE_VERSION})
 set(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE.TXT")
 if(WIN32 AND NOT UNIX)
-  set(CPACK_NSIS_COMPRESSOR "/SOLID lzma \r\n SetCompressorDictSize 32")
   if(NOT DEFINED CPACK_PACKAGE_INSTALL_REGISTRY_KEY)
     set(CPACK_PACKAGE_INSTALL_REGISTRY_KEY "LLVM")
   endif()
   set(CPACK_PACKAGE_ICON 
"${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_logo.bmp")
-  set(CPACK_NSIS_MUI_ICON 
"${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_icon.ico")
-  set(CPACK_NSIS_MUI_UNIICON 
"${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_icon.ico")
-  set(CPACK_NSIS_MODIFY_PATH "ON")
-  set(CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL "ON")
-  if( CMAKE_CL_64 )
-    if(NOT DEFINED CPACK_NSIS_INSTALL_ROOT)
-      set(CPACK_NSIS_INSTALL_ROOT "$PROGRAMFILES64")
+  if (CPACK_GENERATOR STREQUAL "NSIS")
+    set(CPACK_NSIS_COMPRESSOR "/SOLID lzma \r\n SetCompressorDictSize 32")
+    set(CPACK_NSIS_MUI_ICON 
"${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_icon.ico")
+    set(CPACK_NSIS_MUI_UNIICON 
"${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_icon.ico")
+    set(CPACK_NSIS_MODIFY_PATH "ON")
+    set(CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL "ON")
+    if( CMAKE_CL_64 )
+      if(NOT DEFINED CPACK_NSIS_INSTALL_ROOT)
+        set(CPACK_NSIS_INSTALL_ROOT "$PROGRAMFILES64")
+      endif()
     endif()
   endif()
+  if(CPACK_GENERATOR STREQUAL "WIX")
+    set(CPACK_WIX_PRODUCT_ICON 
"${CMAKE_CURRENT_SOURCE_DIR}\\\\cmake\\\\nsis_icon.ico")
+    # The WIX installer needs admin privileges unless we use this flag.
+    set(CPACK_WIX_LIGHT_EXTRA_FLAGS "-sval")
+  endif()
 endif()
 include(CPack)
 
diff --git a/llvm/utils/release/build_llvm_release.bat 
b/llvm/utils/release/build_llvm_release.bat
index 9eebd75d82dd8..76397929c7ed3 100644
--- a/llvm/utils/release/build_llvm_release.bat
+++ b/llvm/utils/release/build_llvm_release.bat
@@ -188,7 +188,6 @@ set common_cmake_flags=^
   -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;lld" ^
   -DLLVM_ENABLE_RUNTIMES="compiler-rt;openmp" ^
   -DCPACK_GENERATOR="WIX" ^
-  -DCPACK_WIX_LIGHT_EXTRA_FLAGS="-sval" ^
   -DCOMPILER_RT_BUILD_ORC=OFF
 
 if "%force-msvc%" == "" (

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