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When building boost as static library with debug flags your libraries will be compiled with name e.g.: libboost_filesystem-vc140-mt-sgd-x64-1_71.lib

Note in particular the -sgd- in the name.

When running FindBoost with Boost_DEBUG enabled you get the following output:

Searching for FILESYSTEM_LIBRARY_DEBUG: libboost_filesystem-vc140-mt-gd-x64-1_71;libboost_filesystem-vc140-mt-gd-x64;libboost_filesystem-vc140-mt-gd;libboost_filesystem-mt-gd-x64-1_71;libboost_filesystem-mt-gd-x64;libboost_filesystem-mt-gd;libboost_filesystem-mt;libboost_filesystem;libboost_filesystem-vc140-mt-s-gd-x64-1_71;libboost_filesystem-vc140-mt-s-gd-x64;libboost_filesystem-vc140-mt-s-gd;libboost_filesystem-mt-s-gd-x64-1_71;libboost_filesystem-mt-s-gd-x64;libboost_filesystem-mt-s-gd

In particular note the libboost_filesystem-vc140-mt-s-gd-x64-1_71 which is correct except for the dash between s-gd.

If I specify Boost_USE_STATIC_RUNTIME everything works and the -sgd- version is found (and listed in the Searching ... output).

If this parameter is not set the workaround in line 2111 is used. Since _boost_DEBUG_ABI_TAG contains a - already this goes bad so instead of

set(_boost_DEBUG_STATIC_ABI_TAG "-s${_boost_DEBUG_ABI_TAG}")

we should have something like

string(SUBSTRING ${_boost_DEBUG_ABI_TAG} 1 -1 _boost_DEBUG_ABI_TAG_NO_DASH)
set(_boost_DEBUG_STATIC_ABI_TAG "-s${_boost_DEBUG_ABI_TAG_NO_DASH}")

Note, this is untested and might need a guard against zero length _boost_DEBUG_ABI_TAG.

Cheers, Arno