id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
13433,b2 emits strange error message when building 1.66.0 on windows 10 against very new visual studio,ivandavid14@…,Vladimir Prus,"Hello, I am try to build boost against the latest version of visual studio (15.5.5, I know that 15.5.6 is out though, shouldn't be too different) and I am getting this error

failed to write command file!

when running this command

b2.exe --hash address-model=32 debug --stagedir=bin\v141\Win32\ -a --toolset=msvc-14.1 cxxflags=""/D""_WIN32_WINNT=0x0600"" /std:c++17 /Qspectre /D""_HAS_AUTO_PTR_ETC=1""""

It has passed sometimes however it frequently doesn't. Its unclear what exactly I am doing that causes this error

Here are the things I've done step by step

1: Download boost source code and unzip it

2: run bootstrap.bat

3: run above cmd line from the visual studio developer command prompt (this has failed when using powershell too)

this was the last few things that were printed
Info: Boost.Config is older than your compiler version - probably nothing bad will happen - but you may wish to look for an update Boost version.  Define BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE to suppress this message.
msvc.archive bin.v2\libs\date_time\build\a1668ad3e8cba9b190515cabd106a4cf\libboost_date_time-vc141-mt-gd-x32-1_66.lib
common.copy bin\v141\Win32\lib\libboost_date_time-vc141-mt-gd-x32-1_66.lib
bin.v2\libs\date_time\build\a1668ad3e8cba9b190515cabd106a4cf\libboost_date_time-vc141-mt-gd-x32-1_66.lib
        1 file(s) copied.
compile-c-c++ bin.v2\libs\exception\build\a1668ad3e8cba9b190515cabd106a4cf\clone_current_exception_non_intrusive.obj
clone_current_exception_non_intrusive.cpp
Info: Boost.Config is older than your compiler version - probably nothing bad will happen - but you may wish to look for an update Boost version.  Define BOOST_CONFIG_SUPPRESS_OUTDATED_MESSAGE to suppress this message.
failed to write command file!

I am unsure what is causing this. I don't think I am passing in parameters to the cxx flags incorrectly. I am filing a ticket because I suspect there might be a bug in b2 or bjam.",Bugs,new,To Be Determined,build,Boost 1.66.0,Problem,,b2 bjam,