Update for 15.5 preview about config

[OlafvdSpek]

@jzmaddock 15.3 is 1911 isn't it?
15.5 is 1912

https://blogs.msdn.microsoft.com/vcblog/2017/11/15/msvc-conformance-improvements-in-visual-studio-2017-version-15-5/

[jzmaddock]

If we're signalling that version 1920 is supported, I'd like to know what, if any new features have been added since this appears to be a new compiler version (unlike msvc 15.4 which keeps the compiler version at 1910).

[danieljames]

I'm not sure, I created this to flag up the issue in case you hadn't noticed. But there are some release notes.

[OlafvdSpek]

@jzmaddock Can this be done for 1.66 or is it too late?

[egorpugin]

VS15.5 is out.
+1 to previous question.

[danieljames]

We're closing for release tomorrow, so we'd probably have to delay the release to handle this. It can have knock on effects for other libraries.

[egorpugin]

True. You probably need some policy for handling such situations.
Possible solution is to ship VS15.5 fixes into 1.66.1 as it was for 1.65.1.

Now I see tons of warnings in C++17 mode in VS15.5 on current master.

[OlafvdSpek]

Taking action sooner would help a lot too..

[pdimov]

Results of the Config tests for 15.5:

C:\Projects\boost-git\boost\libs\config\test\all>b2 toolset=msvc-14.1 | grep \.\
.\.failed
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx11_sfinae_
expr_fail.test\msvc-14.1\debug\threadapi-win32\threading-multi\no_cxx11_sfinae_e
xpr_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_ded_typename_
fail.test\msvc-14.1\debug\threadapi-win32\threading-multi\no_ded_typename_fail.o
bj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_two_phase_loo
kup_fail.test\msvc-14.1\debug\threadapi-win32\threading-multi\no_two_phase_looku
p_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\has_macro_use_fa
cet_fail.test\msvc-14.1\debug\threadapi-win32\threading-multi\has_macro_use_face
t_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\has_nrvo_fail.te
st\msvc-14.1\debug\threadapi-win32\threading-multi\has_nrvo_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_com_value_ini
t_fail.test\msvc-14.1\debug\threadapi-win32\threading-multi\no_com_value_init_fa
il.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx11_hdr_cod
ecvt_fail.test\msvc-14.1\debug\threadapi-win32\threading-multi\no_cxx11_hdr_code
cvt_fail.obj...
...failed updating 7 targets...

[pdimov]

Same in C++17 mode:

C:\Projects\boost-git\boost\libs\config\test\all>b2 toolset=msvc-14.1 cxxstd=17
| grep \.\.\.failed
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx11_sfinae_
expr_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\no_
cxx11_sfinae_expr_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx17_fold_ex
pressions_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-mult
i\no_cxx17_fold_expressions_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx17_inline_
variables_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-mult
i\no_cxx17_inline_variables_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_ded_typename_
fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\no_ded_t
ypename_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_two_phase_loo
kup_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\no_t
wo_phase_lookup_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\has_macro_use_fa
cet_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\has_
macro_use_facet_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\has_nrvo_fail.te
st\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\has_nrvo_fail.o
bj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_com_value_ini
t_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\no_com
_value_init_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx11_hdr_cod
ecvt_fail.test\msvc-14.1\debug\cxxstd-17-iso\threadapi-win32\threading-multi\no_
cxx11_hdr_codecvt_fail.obj...
...failed updating 9 targets...

[pdimov]

For reference, here's msvc-14.0 on the same tests:

C:\Projects\boost-git\boost\libs\config\test\all>b2 toolset=msvc-14.0 | grep \.\
.\.failed
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_ded_typename_
fail.test\msvc-14.0\debug\threadapi-win32\threading-multi\no_ded_typename_fail.o
bj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_two_phase_loo
kup_fail.test\msvc-14.0\debug\threadapi-win32\threading-multi\no_two_phase_looku
p_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\has_macro_use_fa
cet_fail.test\msvc-14.0\debug\threadapi-win32\threading-multi\has_macro_use_face
t_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\has_nrvo_fail.te
st\msvc-14.0\debug\threadapi-win32\threading-multi\has_nrvo_fail.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_com_value_ini
t_fail.test\msvc-14.0\debug\threadapi-win32\threading-multi\no_com_value_init_fa
il.obj...
...failed compile-c-c++ ..\..\..\..\bin.v2\libs\config\test\all\no_cxx11_hdr_cod
ecvt_fail.test\msvc-14.0\debug\threadapi-win32\threading-multi\no_cxx11_hdr_code
cvt_fail.obj...
...failed updating 6 targets...

[jzmaddock]

Please see: #198