id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5987	Error in boost-build/jam_src/build.bat	multisitetracker@…	Vladimir Prus	"in :Start
if ""_%1_"" == ""__"" (
    call :Guess_Toolset
    if not errorlevel 1 goto Setup_Toolset
) else (
    call :Test_Option ""%1""
    if not errorlevel 1 ( <-- error here
        call :Guess_Toolset
        if not errorlevel 1 goto Setup_Toolset
    ) else (
        setlocal & endlocal
        set ""BOOST_JAM_TOOLSET=%1""
        shift
        goto Setup_Toolset
    )
)

is incorrect, will always ignore specified toolset, should be

if ""_%1_"" == ""__"" (
    call :Guess_Toolset
    if not errorlevel 1 goto Setup_Toolset
) else (
    call :Test_Option ""%1""
    if errorlevel 1 (
        call :Guess_Toolset
        if not errorlevel 1 goto Setup_Toolset
    ) else (
        setlocal & endlocal
        set ""BOOST_JAM_TOOLSET=%1""
        shift
        goto Setup_Toolset
    )
)
which then allows 
>build mingw 
to work correctly"	Bugs	new	To Be Determined	build	Boost 1.47.0	Problem		script error