[Clang] Respect MS layout attributes during CUDA/HIP device compilation (#146620)

This patch fixes an issue where Microsoft-specific layout attributes,
such as __declspec(empty_bases), were ignored during CUDA/HIP device
compilation on a Windows host. This caused a critical memory layout
mismatch between host and device objects, breaking libraries that rely
on these attributes for ABI compatibility.

The fix introduces a centralized hasMicrosoftRecordLayout() check within
the TargetInfo class. This check is aware of the auxiliary (host) target
and is set during TargetInfo::adjust if the host uses a Microsoft ABI.

The empty_bases, layout_version, and msvc::no_unique_address attributes
now use this centralized flag, ensuring device code respects them and
maintains layout consistency with the host.

Fixes: https://github.com/llvm/llvm-project/issues/146047

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 4ebec8e..b7f52fd 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -631,7 +631,7 @@ private:
     //
     // FIXME: We shouldn't need to do this, the target should be immutable once
     // created. This complexity should be lifted elsewhere.
-    Target->adjust(PP.getDiagnostics(), LangOpt);
+    Target->adjust(PP.getDiagnostics(), LangOpt, /*AuxTarget=*/nullptr);
 
     // Initialize the preprocessor.
     PP.Initialize(*Target);