I am using Boost test library now and find there are several libraries there:

libboost_unit_test_framework-mgw46-1_47.a
libboost_unit_test_framework-mgw46-mt-1_47.a
libboost_unit_test_framework-mgw46-s-1_47.a

what are differences between the 3 libraies (with "s", or with "mt", or no "mt" and "s")?


also, for VC++ compiler, there is:

boost_unit_test_framework-vc100-mt-1_47.dll

but MinGW have:

libboost_unit_test_framework-mgw46-mt-1_47.dll
libboost_unit_test_framework-mgw46-1_47.dll

Why MinGW have more?