Implement NoSEH flag setting for crossgened modules in ILLink (#117779)

Copilot · AaronRobinsonMSFT · web-flow · commit a3df2a80eba1 · 2025-08-06T11:31:04.000-07:00
* Set NoSEH flag for crossgened modules in ILLink output

Co-authored-by: AaronRobinsonMSFT &lt;30635565+AaronRobinsonMSFT@users.noreply.github.com&gt;
diff --git a/src/tools/illink/src/linker/Linker.Steps/OutputStep.cs b/src/tools/illink/src/linker/Linker.Steps/OutputStep.cs
@@ -100,6 +100,7 @@ protected virtual void WriteAssembly(AssemblyDefinition assembly, string directo
                     module.Attributes |= ModuleAttributes.ILOnly;
                     module.Attributes ^= ModuleAttributes.ILLibrary;
                     module.Architecture = TargetArchitecture.I386; // I386+ILOnly which ultimately translates to AnyCPU
+                    module.Characteristics |= ModuleCharacteristics.NoSEH;
                 }
             }
 

Original file line number	Diff line number	Diff line change
`@@ -100,6 +100,7 @@ protected virtual void WriteAssembly(AssemblyDefinition assembly, string directo`
`100`	`100`	`module.Attributes \|= ModuleAttributes.ILOnly;`
`101`	`101`	`module.Attributes ^= ModuleAttributes.ILLibrary;`
`102`	`102`	`module.Architecture = TargetArchitecture.I386; // I386+ILOnly which ultimately translates to AnyCPU`
	`103`	`+ module.Characteristics \|= ModuleCharacteristics.NoSEH;`
`103`	`104`	`}`
`104`	`105`	`}`
`105`	`106`