[flang-commits] [flang] [flang][runtime] Workaround cuda-11.8 compilation issue. (PR #68459)

[Slava Zakharin via flang-commits]

https://github.com/vzakhari created https://github.com/llvm/llvm-project/pull/68459

cuda-11.8 nvcc cannot handle brace initialization of the lambda
object. 12.1 works okay, but I would like to have an option
to use 11.8.


>From 9e65483d9cece12ce995010a20d21473816a1450 Mon Sep 17 00:00:00 2001
From: Slava Zakharin <szakharin at nvidia.com>
Date: Fri, 6 Oct 2023 16:14:06 -0700
Subject: [PATCH] [flang][runtime] Workaround cuda-11.8 compilation issue.

cuda-11.8 nvcc cannot handle brace initialization of the lambda
object. 12.1 works okay, but I would like to have an option
to use 11.8.
---
 flang/runtime/assign.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/flang/runtime/assign.cpp b/flang/runtime/assign.cpp
index 458a1ba006b690e..237acb0c89fc2e3 100644
--- a/flang/runtime/assign.cpp
+++ b/flang/runtime/assign.cpp
@@ -263,10 +263,12 @@ RT_API_ATTRS static void Assign(
   }
   std::size_t toElementBytes{to.ElementBytes()};
   std::size_t fromElementBytes{from.ElementBytes()};
-  auto isSimpleMemmove{[&]() {
+  // The following lambda definition violates the conding style,
+  // but cuda-11.8 nvcc hits an internal error with the brace initialization.
+  auto isSimpleMemmove = [&]() {
     return !toDerived && to.rank() == from.rank() && to.IsContiguous() &&
         from.IsContiguous() && toElementBytes == fromElementBytes;
-  }};
+  };
   StaticDescriptor<maxRank, true, 10 /*?*/> deferredDeallocStatDesc;
   Descriptor *deferDeallocation{nullptr};
   if (MayAlias(to, from)) {