[PATCH] D106303: [clang] fix oops: enable implicit moves in MSVC compatibility mode

[Matheus Izvekov via Phabricator via cfe-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG1d68ecafd6ad: [clang] fix oops: enable implicit moves in MSVC compatibility mode (authored by mizvekov).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D106303/new/

https://reviews.llvm.org/D106303

Files:
  clang/lib/Sema/SemaStmt.cpp
  clang/test/SemaCXX/cxx2b-p2266-disable-with-msvc-compat.cpp


Index: clang/test/SemaCXX/cxx2b-p2266-disable-with-msvc-compat.cpp
===================================================================
--- clang/test/SemaCXX/cxx2b-p2266-disable-with-msvc-compat.cpp
+++ clang/test/SemaCXX/cxx2b-p2266-disable-with-msvc-compat.cpp
@@ -48,3 +48,5 @@
   throw x; // new-error {{no matching constructor for initialization}}
 } catch (...) {
 }
+
+MoveOnly test6(MoveOnly x) { return x; }
Index: clang/lib/Sema/SemaStmt.cpp
===================================================================
--- clang/lib/Sema/SemaStmt.cpp
+++ clang/lib/Sema/SemaStmt.cpp
@@ -3483,7 +3483,12 @@
 Sema::PerformMoveOrCopyInitialization(const InitializedEntity &Entity,
                                       const NamedReturnInfo &NRInfo,
                                       Expr *Value) {
-  if (!getLangOpts().CPlusPlus2b && NRInfo.isMoveEligible()) {
+  // FIXME: We force P1825 implicit moves here in msvc compatibility mode
+  // because we are disabling simpler implicit moves as a temporary
+  // work around, as the MSVC STL has issues with this change.
+  // We will come back later with a more targeted approach.
+  if ((!getLangOpts().CPlusPlus2b || getLangOpts().MSVCCompat) &&
+      NRInfo.isMoveEligible()) {
     ImplicitCastExpr AsRvalue(ImplicitCastExpr::OnStack, Value->getType(),
                               CK_NoOp, Value, VK_XValue, FPOptionsOverride());
     Expr *InitExpr = &AsRvalue;


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