[Boost-build] Failure to build - missing cl.exe

Subject: [Boost-build] Failure to build - missing cl.exe
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2014-10-23 10:49:03

I have come to run a jamfile to repeat some tests, (bjam output below) but it no
longer seems to work because cl.exe is no longer found.

I:\modular-boost\libs\math\test>cl.exe -?
'cl.exe' is not recognized as an internal or external command,
operable program or batch file.

I don't think *I* have altered the PATH for some time, but MS Visual Studio
spent some unusual time fiddling with itself this morning (doing an update?) at
its startup.

Do I just need to add the path to /bin/cl.exe to my PATH?

Is vsvarsall.bat supposed to be called to do this?

What have a messed up to cause this?

Suggestions welcome.

---
Paul A. Bristow
Prizet Farmhouse
Kendal UK LA8 8AB
[phone]
Performing configuration checks
    - symlinks supported       : yes (cached)
    - has_icu builds           : no  (cached)
    - gcc visibility           : no  (cached)
    - long double support      : yes (cached)
    - Intel _Quad datatype support : no  (cached)
    - GCC libquadmath and __float128 support : no  (cached)
    - has_ntl_rr builds        : no  (cached)
    - has_mpfr_class builds    : no  (cached)
    - has_mpreal builds        : no  (cached)
    - has_e_float builds       : no  (cached)
    - has_gmpxx builds         : no  (cached)
    - 128-bit floatmax_t       : no  (cached)
...patience...
...patience...
...patience...
...found 15490 targets...
...updating 1718 targets...
compile-c-c++-pch
..\..\..\bin.v2\libs\math\build\msvc-12.0\debug\asynch-exceptions-on\link-static
\threading-multi\pch.pch
Access is denied.
'cl' is not recognized as an internal or external command,
operable program or batch file.