[PATCH] D24371: Add diagnostics to require_constant_initialization

Richard Smith via cfe-commits cfe-commits at lists.llvm.org
Fri Sep 9 13:36:47 PDT 2016

rsmith added inline comments.

Comment at: lib/Sema/SemaDecl.cpp:10535-10538
@@ -10534,1 +10534,6 @@
           << attr->getRange();
+        APValue Value;
+        SmallVector<PartialDiagnosticAt, 8> Notes;
+        cast<Expr>(var->ensureEvaluatedStmt()->Value)->EvaluateAsInitializer(
+          Value, getASTContext(), var, Notes);
+        for (auto &it : Notes)
loladiro wrote:
> rsmith wrote:
> > Can you capture the diagnostics from `checkInitIsICE` instead of recomputing them here? (It looks straightforward to add an overload that takes a vector of notes.) In the non-C++11 case, you can produce a note pointing to `CacheCulprit` instead.
> The problem is that the result of checking is cached internally and the diagnostics are only produced the first time. I don't think it's necessarily guaranteed that the above `checkInitIsICE` is the first such call (unless you can see such a reason). 
That's unfortunate, but yeah, it's not reasonable to rely on that. Please just use `Init` instead of `cast<Expr>(var->ensureEvaluatedStmt()->Value)` here (`ensureEvaluatedStmt()` really ought to be a private member of `VarDecl`...).



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