From af8771f9747041d87cfc8984613c7f803ca10e75 Mon Sep 17 00:00:00 2001
From: Eduard Voronkin <edward.voronkin@gmail.com>
Date: Thu, 25 Dec 2025 12:50:21 -0800
Subject: FASTBuild: set PlatformToolset in the generated .bff file

Fixes: #27481
---
 Source/cmGlobalFastbuildGenerator.cxx | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Source/cmGlobalFastbuildGenerator.cxx b/Source/cmGlobalFastbuildGenerator.cxx
index 7b613c7..383a129 100644
--- a/Source/cmGlobalFastbuildGenerator.cxx
+++ b/Source/cmGlobalFastbuildGenerator.cxx
@@ -1437,6 +1437,14 @@ void cmGlobalFastbuildGenerator::WriteTarget(FastbuildTarget const& target)
 }
 void cmGlobalFastbuildGenerator::WriteIDEProjects()
 {
+#if defined(_WIN32)
+  std::string platformToolset;
+  std::string const toolset =
+    this->GetSafeGlobalSetting("MSVC_TOOLSET_VERSION");
+  if (!toolset.empty()) {
+    platformToolset = cmStrCat('v', toolset);
+  }
+#endif
   for (auto const& proj : IDEProjects) {
     (void)proj;
     // VS
@@ -1445,6 +1453,9 @@ void cmGlobalFastbuildGenerator::WriteIDEProjects()
     WriteCommand("VCXProject", Quote(VSProj.Alias));
     *this->BuildFileStream << "{\n";
     WriteVariable("ProjectOutput", Quote(VSProj.ProjectOutput), 1);
+    if (!platformToolset.empty()) {
+      WriteVariable("PlatformToolset", Quote(platformToolset), 1);
+    }
     WriteIDEProjectConfig(VSProj.ProjectConfigs);
     WriteVSBuildCommands();
     WriteIDEProjectCommon(VSProj);
-- 
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