Re: [boost] Has testing on msvc been dropped?

27 Feb 2023

      Am 27.02.2023 um 13:24 schrieb Andrey Semashev via Boost:
...
On 2/27/23 15:16, Glen Fernandes wrote:
...
On Mon, Feb 27, 2023 at 6:49 AM Daniela Engert wrote:
I've noticed that e.g. Boost.Log no longer compiles on msvc 19.35 (i.e.
     VS2022 update 5). Looking at the test matrix to figure out where the
     problem might lie, I couldn't find any column with the test results of
     *any* msvc version, lest the current one. Is there a reason for no
     longer running the tests with msvc compilers?
I don't believe it's intentional.
Tom, do you know why the MSVC runners aren't reporting any results?
Andrey, Log does use Appveyor for MSVC testing
too:https://ci.appveyor.com/project/Lastique/log
https://ci.appveyor.com/project/Lastique/log  but there's no 1935 being
tested there.
Yes, Boost.Log is being tested on AppVeyor, and there is a VS2022 job
(not sure which update, though).
Is it because of this problem?
https://github.com/boostorg/parameter/issues/111
It's not. The error in question is

phoenix\support\preprocessed\vector_10.hpp(62,1): error C7527: 'A0': a template parameter name cannot be reused within its scope
phoenix\support\preprocessed\vector_10.hpp(62,1): error C7527: BOOST_FUSION_ADAPT_TPL_STRUCT_NO_PARTIAL(
phoenix\support\preprocessed\vector_10.hpp(62,1): error C7527: ^
phoenix\support\preprocessed\vector_10.hpp(66,1): message : see previous definition of 'A0'
phoenix\support\preprocessed\vector_10.hpp(66,1): message : )
phoenix\support\preprocessed\vector_10.hpp(66,1): message : ^

BOOST_FUSION_ADAPT_TPL_STRUCT_NO_PARTIAL expands to

namespace boost {
namespace fusion {
namespace traits {
template <typename A0> struct tag_of {
   typedef struct_tag type;
};
template <typename A0> struct tag_of {
   typedef struct_tag type;
};
} // namespace traits
namespace extension {
template <typename A0>
struct access::struct_member {
   typedef A0 attribute_type;
   typedef A0 A0;
   typedef attribute_type type;
   template <typename Seq> struct apply {
     typedef typename add_reference<
         typename mpl::eval_if,
                               mpl::identity>::type>::type type;
     constexpr static type call(Seq &seq) { return seq.a0; }
   };
};
template <typename A0>
struct struct_member_name {
   typedef char const *type;
   constexpr static type call() { return "a0"; }
};
template <typename A0>
struct struct_size : mpl::int_<1> {};
template <typename A0>
struct struct_is_view : mpl::false_ {};
} // namespace extension
} // namespace fusion
namespace mpl {
template <typename> struct sequence_tag;
template <typename A0> struct sequence_tag {
   typedef fusion::fusion_sequence_tag type;
};
template <typename A0> struct sequence_tag {
   typedef fusion::fusion_sequence_tag type;
};
} // namespace mpl
} // namespace boost

The offending code is

typedef A0 A0;

in

template <typename A0>
struct access::struct_member

I've checked this expansion on CE with e.g. gcc and it complains for the 
same reason. I suspect an obsolete workaround in one of the libs that 
'boost/log/sinks.hpp' depends on and has now become hostile and holds 
Boost.Log ransom.

Thanks,
   Dani

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