boost/rational.hpp and VS2019

From: John Emmas (john_at_[hidden])
Date: 2021-08-16 14:32:55

I'm guessing this might be solvable by updating to a newer version of 
boost (currently I'm running ver 1.71.0) but before updating, I wondered 
if there might be something obvious that 'm missing....

I'm building with Visual Studio 2019 and I get a whole bunch of errors 
simply by adding this line to an empty source file:-

       #include "boost/rational.hpp"

It seems to be the same 6 errors but at various different lines - i.e. 
these errors, over & over again:-

       Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\ammintrin.h(146,19): 
error C4430: missing type specifier - int assumed. Note: C++ does not 
support default-int
       Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\ammintrin.h(146,8): 
error C2146: syntax error: missing ';' before identifier '_mm_macc_ps'
       Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\ammintrin.h(147,20): 
error C4430: missing type specifier - int assumed. Note: C++ does not 
support default-int
       Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\ammintrin.h(147,9): 
error C2146: syntax error: missing ';' before identifier '_mm_macc_pd'
       Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\ammintrin.h(148,19): 
error C4430: missing type specifier - int assumed. Note: C++ does not 
support default-int
       Visual 
Studio\2019\Community\VC\Tools\MSVC\14.29.30133\include\ammintrin.h(148,1): 
error C2086: 'int __m128': redefinition

I just wondered if this might ring a bell with someone?  e.g. might 
there be some preprocesser #define that I should've defined?  (or a 
#define that I shouldn't be defining...)

Thanks for any suggestions,  John