"...failed gcc-Link-action", mingw tools

[archimed7592]

boost-1.33.1
mingw-3.4.2

    "g++"  "-Wl,--enable-auto-image-base" "-Wl,--exclude-symbols,_bss_end__:_bss_start__:_data_end__:_data_start__" "-Wl,--out-implib,bin\boost\libs\filesystem\build\boost_filesystem.dll\mingw\debug\boost_filesystem-mgw-d-1_33_1.lib" -g -shared -Wl,--allow-multiple-definition -mno-cygwin -o "bin\boost\libs\filesystem\build\boost_filesystem.dll\mingw\debug\boost_filesystem-mgw-d-1_33_1.dll"  -L"" "bin\boost\libs\filesystem\build\boost_filesystem.dll\mingw\debug\exception.obj" "bin\boost\libs\filesystem\build\boost_filesystem.dll\mingw\debug\operations_posix_windows.obj" "bin\boost\libs\filesystem\build\boost_filesystem.dll\mingw\debug\path_posix_windows.obj" "bin\boost\libs\filesystem\build\boost_filesystem.dll\mingw\debug\convenience.obj"      
    
...failed gcc-Link-action

-L"" cause to loss one object file instead of add "empty path" to lib-lookups table.

caused by these lines from mingw-tools.jam
    # So that RUNPATH, and PATH, is set to include where the mingw DLLs are located.
    flags mingw STDLIBPATH : $(GCC_BIN_DIRECTORY) ;

workaround is to pass "-sMINGW_ROOT_DIRECTORY=/mingw" to bjam invocation (i'm using msys), but documentation says
MINGW_ROOT_DIRECTORY  	Path to installation of MinGW.  	(none)  	If not set tools must be available in the executable path
so it isn't obligatory to pass that argument.