[llvm-branch-commits] [clang] [llvm] release/19.x: workflows/release-binaries: Enable flang builds on Windows (#101344) (PR #106480)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport 8927576b8f6442bb6129bda597efee46176f8aec

Requested by: @<!-- -->tstellar

---
Full diff: https://github.com/llvm/llvm-project/pull/106480.diff


2 Files Affected:

- (modified) .github/workflows/release-binaries.yml (-8) 
- (modified) clang/cmake/caches/Release.cmake (+5-2) 


``````````diff
diff --git a/.github/workflows/release-binaries.yml b/.github/workflows/release-binaries.yml
index 509016e5b89c45..672dd7517d23ce 100644
--- a/.github/workflows/release-binaries.yml
+++ b/.github/workflows/release-binaries.yml
@@ -135,16 +135,8 @@ jobs:
           target_cmake_flags="$target_cmake_flags -DBOOTSTRAP_DARWIN_osx_ARCHS=$arches -DBOOTSTRAP_DARWIN_osx_BUILTIN_ARCHS=$arches"
         fi
 
-        # x86 macOS and x86 Windows have trouble building flang, so disable it.
-        # Windows: https://github.com/llvm/llvm-project/issues/100202
-        # macOS: 'rebase opcodes terminated early at offset 1 of 80016' when building __fortran_builtins.mod
         build_flang="true"
 
-        if [ "$target" = "Windows-X64" ]; then
-          target_cmake_flags="$target_cmake_flags -DLLVM_RELEASE_ENABLE_PROJECTS=\"clang;lld;lldb;clang-tools-extra;bolt;polly;mlir\""
-          build_flang="false"
-        fi
-
         if [ "${{ runner.os }}" = "Windows" ]; then
           # The build times out on Windows, so we need to disable LTO.
           target_cmake_flags="$target_cmake_flags -DLLVM_RELEASE_ENABLE_LTO=OFF"
diff --git a/clang/cmake/caches/Release.cmake b/clang/cmake/caches/Release.cmake
index e5161dd9a27b96..6d5f75ca0074ee 100644
--- a/clang/cmake/caches/Release.cmake
+++ b/clang/cmake/caches/Release.cmake
@@ -47,11 +47,14 @@ set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "")
 set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "")
 
 set(STAGE1_PROJECTS "clang")
-set(STAGE1_RUNTIMES "")
+
+# Building Flang on Windows requires compiler-rt, so we need to build it in
+# stage1.  compiler-rt is also required for building the Flang tests on
+# macOS.
+set(STAGE1_RUNTIMES "compiler-rt")
 
 if (LLVM_RELEASE_ENABLE_PGO)
   list(APPEND STAGE1_PROJECTS "lld")
-  list(APPEND STAGE1_RUNTIMES "compiler-rt")
   set(CLANG_BOOTSTRAP_TARGETS
     generate-profdata
     stage2-package

``````````

</details>


https://github.com/llvm/llvm-project/pull/106480