deal with vs 2015 being pedantic about alignment issues.

[bdeluca]

It still breaks compiling tryConvert(...) as it wasnt to call tryConvert(T) rathern than tryConvert(const T&)

s:\storage\git\oiio.git\src\include\openimageio\tinyformat.h(178): error C2718: 'const OpenImageIO::v1_7::simd::int4': actual parameter with requested alignment of 16 won't be aligned
s:\storage\git\oiio.git\src\include\openimageio\tinyformat.h(600): note: see reference to class template instantiation 'tinyformat::detail::is_convertible<const T &,int>' being compiled
        with
        [
            T=OpenImageIO::v1_7::simd::int4
        ]
s:\storage\git\oiio.git\src\include\openimageio\tinyformat.h(883): note: see reference to function template instantiation 'void tinyformat::detail::FormatIterator::accept<T1>(const T &)' being compiled
        with
        [
            T1=OpenImageIO::v1_7::simd::int4,
            T=OpenImageIO::v1_7::simd::int4
        ]
s:\storage\git\oiio.git\src\include\openimageio\tinyformat.h(944): note: see reference to function template instantiation 'void tinyformat::detail::format<T1,T2>(tinyformat::detail::FormatIterator &,const T1 &,const T2 &)' being compiled
        with
        [
            T1=OpenImageIO::v1_7::simd::int4,
            T2=OpenImageIO::v1_7::simd::int4
        ]
S:\storage\git\oiio.git\src\include\OpenImageIO/strutil.h(91): note: see reference to function template instantiation 'void tinyformat::format<T1,T2>(std::ostream &,const char *,const T1 &,const T2 &)' being compiled
        with
        [
            T1=OpenImageIO::v1_7::simd::int4,
            T2=OpenImageIO::v1_7::simd::int4
        ]
S:\storage\git\oiio.git\src\libutil\simd_test.cpp(420): note: see reference to function template instantiation 'std::string OpenImageIO::v1_7::Strutil::format<OpenImageIO::v1_7::simd::int4,OpenImageIO::v1_7::simd::int4>(const char *,const T1 &,const T2 &)' being compiled
        with
        [
            T1=OpenImageIO::v1_7::simd::int4,
            T2=OpenImageIO::v1_7::simd::int4
        ]

[bdeluca]

This builds on windows in appveyor here and fails in linux/osx
on my systems
This fails on windows and builds in linux/osx

[lgritz]

I don't quite understand why this should be an error. Are aligned types not allowed to be passed as value (stack) parameters?

[bdeluca]

its a little bit over my head, but I think there is no guarantee that the copied value is aligned.
ms says this https://msdn.microsoft.com/en-us/library/sxe76d9e.aspx

it seems to have been triggered by me trying to use boost 1.60 there is some more about it here https://datastax-oss.atlassian.net/browse/CPP-341

[lgritz]

Are you compiling for a 32 bit target?

Why do my appveyor builds succeed?

[bdeluca]

I don't think It was a 32 bit target but with nmake It was hard to be 100% sure.
I think it came down you appveyor running boost 1.59 vs the boost 1.60 trying.

Next week I can come back to trying it with 1.60 again and confirm it was this. All my cpu is compiling other stuff today.