VS: Add flag table entry for -Qspectre

Add special logic to map this flag to a top-level build setting
instead of being in ClCompile.

Fixes: #18426

1 files changed, 8 insertions, 0 deletions

diff --git a/Source/cmVisualStudio10TargetGenerator.cxx b/Source/cmVisualStudio10TargetGenerator.cxx
index 16eca96..57d66e0 100644
--- a/Source/cmVisualStudio10TargetGenerator.cxx
+++ b/Source/cmVisualStudio10TargetGenerator.cxx
@@ -1125,6 +1125,9 @@ void cmVisualStudio10TargetGenerator::WriteMSToolConfigurationValues(
   if (this->IPOEnabledConfigurations.count(config) > 0) {
     e1.Element("WholeProgramOptimization", "true");
   }
+  if (this->SpectreMitigationConfigurations.count(config) > 0) {
+    e1.Element("SpectreMitigation", "Spectre");
+  }
 }
 
 void cmVisualStudio10TargetGenerator::WriteMSToolConfigurationValuesManaged(
@@ -2625,6 +2628,11 @@ bool cmVisualStudio10TargetGenerator::ComputeClOptions(
     }
   }
 
+  if (clOptions.HasFlag("SpectreMitigation")) {
+    this->SpectreMitigationConfigurations.insert(configName);
+    clOptions.RemoveFlag("SpectreMitigation");
+  }
+
   this->ClOptions[configName] = std::move(pOptions);
   return true;
 }