Add LayoutSizeOverflow

src/context.rs

@@ -18,6 +18,7 @@
 use rustc_target::spec::{HasTargetSpec, Target, TlsModel};
 
 use crate::callee::get_fn;
+use crate::errors::LayoutSizeOverflow;
 
 #[derive(Clone)]
 pub struct FuncSig<'gcc> {
@@ -477,7 +478,7 @@ impl<'gcc, 'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'gcc, 'tcx> {
     #[inline]
     fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
         if let LayoutError::SizeOverflow(_) = err {
-            self.sess().span_fatal(span, &err.to_string())
+            self.sess().emit_fatal(LayoutSizeOverflow { span, error: err.to_string() })
         } else {
             span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
         }
@@ -495,7 +496,7 @@ fn handle_fn_abi_err(
         fn_abi_request: FnAbiRequest<'tcx>,
     ) -> ! {
         if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err {
-            self.sess().span_fatal(span, &err.to_string())
+            self.sess().emit_fatal(LayoutSizeOverflow { span, error: err.to_string() })
         } else {
             match fn_abi_request {
                 FnAbiRequest::OfFnPtr { sig, extra_args } => {

src/errors.rs

@@ -7,6 +7,14 @@ pub(crate) struct RanlibFailure {
     pub exit_code: Option<i32>
 }
 
+#[derive(SessionDiagnostic)]
+#[diag(codegen_gcc::layout_size_overflow)]
+pub(crate) struct LayoutSizeOverflow {
+    #[primary_span]
+    pub span: Span,
+    pub error: String,
+}
+
 #[derive(SessionDiagnostic)]
 #[diag(codegen_gcc::linkage_const_or_mut_type)]
 pub(crate) struct LinkageConstOrMutType {