From c1859984205f1cd66d62045cabb8b543279e023c Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Thu, 13 Nov 2025 14:48:59 -0500
Subject: [PATCH] VS/CUDA: Forward unknown flags to the host compiler when
 possible

Extend commit 7f15c99851 (CUDA: forward unknown flags to host compiler
when possible, 2019-11-29, v3.17.0-rc1~326^2~1) to work in VS too.

Fixes: #27210
---
 Source/cmVisualStudio10TargetGenerator.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index 3cd9c62d1f..23d7fd6d77 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -3872,7 +3872,8 @@ bool cmVisualStudio10TargetGenerator::ComputeCudaOptions(
   auto cudaVersion = this->GlobalGenerator->GetPlatformToolsetCudaString();
 
   // Get compile flags for CUDA in this directory.
-  std::string flags;
+  std::string flags =
+    this->Makefile->GetSafeDefinition("_CMAKE_CUDA_EXTRA_FLAGS");
   this->LocalGenerator->AddLanguageFlags(
     flags, this->GeneratorTarget, cmBuildStep::Compile, "CUDA", configName);
   this->LocalGenerator->AddCompileOptions(flags, this->GeneratorTarget, "CUDA",