Add diags

.github/workflows/ci.yml

@@ -913,7 +913,7 @@ jobs:
       if: ${{ failure() && runner.debug }}
       uses: mxschmitt/action-tmate@v3
       # When debugging increase to a suitable value!
-      timeout-minutes: 30
+      timeout-minutes: 60
     - name: Prepare code coverage report
       if: ${{ success() && (matrix.coverage == true) }}
       run: |

lib/Differentiator/ReverseModeVisitor.cpp

@@ -1776,8 +1776,9 @@ Expr* getArraySizeExpr(const ArrayType* AT, ASTContext& context,
         pullbackRequest.BaseFunctionName =
             clad::utils::ComputeEffectiveFnName(FD);
         pullbackRequest.Mode = DiffMode::experimental_pullback;
-        // Silence diag outputs in nested derivation process.
-        pullbackRequest.VerboseDiags = false;
+        // Silence diag outputs in nested derivation process unless we are going
+        // through a builtin function which we know we cannot differentiate.
+        pullbackRequest.VerboseDiags = FD->getBuiltinID();
         pullbackRequest.EnableTBRAnalysis = m_DiffReq.EnableTBRAnalysis;
         bool isaMethod = isa<CXXMethodDecl>(FD);
         for (size_t i = 0, e = FD->getNumParams(); i < e; ++i)
@@ -1803,7 +1804,7 @@ Expr* getArraySizeExpr(const ArrayType* AT, ASTContext& context,
         // it already correctly support reference arguments then confirm the
         // support and add tests for the same.
         if (!pullbackFD && !utils::HasAnyReferenceOrPointerArgument(FD) &&
-            !isa<CXXMethodDecl>(FD)) {
+            !isa<CXXMethodDecl>(FD) && !FD->getBuiltinID()) {
           // Try numerically deriving it.
           if (NArgs == 1) {
             OverloadedDerivedFn = GetSingleArgCentralDiffCall(