x3 linker error with separate TU

Hello,

this refers to a question at stackoverflow, where since 14 days no 
answer is known. From my side I've checked the related answers on 
stackoverflow but there seems to be no solution: 
https://stackoverflow.com/questions/43791079/x3-linker-error-with-separate-tu


Maybe here is a better place to get an answer since the rule count rises 
and the compile time increases ... The problems stays with boost 1.64.0 
and gcc-7.10/clang-3.91 too.


Thanks,

Olaf


------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot