rsmith added inline comments.
================
Comment at: include/clang/Basic/AttrDocs.td:858
@@ +857,3 @@
+ };
+ SAFE_STATIC T x = {42}; // OK.
+ SAFE_STATIC T y = 42; // error: variable does not have a constant initializer
----------------
Sure, if that's a conscious design decision for the attribute.
================
Comment at: include/clang/Basic/DiagnosticSemaKinds.td:6842
@@ +6841,3 @@
+
+def err_require_constant_init_failed : Error<
+ "variable does not have a constant initializer as required by the "
----------------
A separate note pointed at the attribute would make it clearer how the
attribute got involved (especially via the macro expansion backtrace).
================
Comment at: lib/Sema/SemaDecl.cpp:10519-10520
@@ +10518,4 @@
+ auto *CE = dyn_cast<CXXConstructExpr>(Init);
+ bool DiagErr = (var->isInitKnownICE() || (CE &&
CE->getConstructor()->isConstexpr()))
+ ? !var->checkInitIsICE() : !checkConstInit();
+ if (DiagErr)
----------------
In C++11 onwards, `checkInitIsICE` is the right thing to use in all cases. In
C++98, `checkInitIsICE` is appropriate for globals of integral type; we do not
have an implementation of strict constant expression checking for other types.
Perhaps just documenting that (and maybe adding a FIXME here) is the best you
can do for now, assuming you're not interested in implementing the C++98 rules.
https://reviews.llvm.org/D23385
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