[cfe-dev] GCC 6 Warnings

[Richard Smith via cfe-dev]

On Wed, Sep 7, 2016 at 3:17 PM, Renato Golin via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Clang folks,
>
> FYI, I'm getting a lot of warnings from GCC 6.1.1 when building Clang...
>
> Haven't had time to look closer and probably won't this week, so if
> anyone would like to have a go... :)
>
>
> include/llvm/Support/Casting.h:183:72: warning: ignoring attributes on
> template argument 'llvm::simplify_type<const clang::Stmt*
> const>::SimpleType {aka const clang::Stmt*}' [-Wignored-attributes]
>

GCC seems confused. There are no attributes here. Perhaps it's confused
because clang::Stmt itself has an alignment attribute on its definition?

include/llvm/Support/Casting.h: In instantiation of 'struct
> llvm::cast_retty<clang::ImplicitCastExpr, const clang::Stmt* const>':
>
> include/llvm/Support/Casting.h:222:1:   required by substitution of
> 'template<class X, class Y> typename std::enable_if<(!
> llvm::is_simple_type<Y>::value), typename llvm::cast_retty<X, const
> Y>::ret_type>::type llvm::cast(const Y&) [with X =
> clang::ImplicitCastExpr; Y = const clang::Stmt*]'
>
> tools/clang/include/clang/AST/ASTTypeTraits.h:383:22:   required from
> 'static const T&
> clang::ast_type_traits::DynTypedNode::DynCastPtrConverter<T,
> BaseT>::getUnchecked(clang::ast_type_traits::ASTNodeKind, const char*)
> [with T = clang::ImplicitCastExpr; BaseT = clang::Stmt]'
>
> tools/clang/include/clang/AST/ASTTypeTraits.h:242:42:   required from
> 'const T& clang::ast_type_traits::DynTypedNode::getUnchecked() const
> [with T = clang::ImplicitCastExpr]'
>
> tools/clang/include/clang/ASTMatchers/ASTMatchersInternal.h:283:19:
> required from 'bool
> clang::ast_matchers::internal::MatcherInterface<T>::dynMatches(const
> clang::ast_type_traits::DynTypedNode&,
> clang::ast_matchers::internal::ASTMatchFinder*,
> clang::ast_matchers::internal::BoundNodesTreeBuilder*) const [with T =
> clang::ImplicitCastExpr]'
>
> tools/clang/unittests/ASTMatchers/ASTMatchersNarrowingTest.cpp:1957:1:
>   required from here
>
> include/llvm/Support/Casting.h:134:74: warning: ignoring attributes on
> template argument 'llvm::simplify_type<const clang::Stmt*
> const>::SimpleType {aka const clang::Stmt*}' [-Wignored-attributes]
>    return isa_impl_wrap<X, const Y,
>           ~~~~~~~~~~~~~~~~~~~~~~~~~
>                         typename simplify_type<const
> Y>::SimpleType>::doit(Val);
>                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ~~~~~~~~~~~~~~~~~~~~^~~~~
>
> etc.
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