[boost] [build] b2 headers broken?

Subject: [boost] [build] b2 headers broken?
From: Eric Niebler (eniebler_at_[hidden])
Date: 2014-07-15 19:03:43

I just updated to the latest develop. I ran bootstrap, then nuked my
boost directory and reran b2 headers. Worked fine. Then I changed
directory to libs/proto/test and ran ../../../b2 mem_ptr to run a test.
Here's what I get:

f:\modular-boost\libs\proto\test>..\..\..\b2 mem_ptr
Performing configuration checks

    - symlinks supported       : no
    - junctions supported      : yes
    - hardlinks supported      : yes
...patience...
...patience...
...found 4951 targets...
...updating 441 targets...
common.mkdir ..\..\..\bin.v2\libs
common.mkdir ..\..\..\bin.v2\libs\proto
common.mkdir ..\..\..\bin.v2\libs\proto\test
common.mkdir ..\..\..\bin.v2\libs\proto\test\mem_ptr.test
common.mkdir ..\..\..\bin.v2\libs\proto\test\mem_ptr.test\msvc-12.0
common.mkdir ..\..\..\bin.v2\libs\proto\test\mem_ptr.test\msvc-12.0\debug
common.mkdir
..\..\..\bin.v2\libs\proto\test\mem_ptr.test\msvc-12.0\debug\link-static
common.mkdir
..\..\..\bin.v2\libs\proto\test\mem_ptr.test\msvc-12.0\debug\link-static\threading-multi
link.rm ..\..\..\boost\mpl
common.mkdir ..\..\..\boost\mpl
link.hardlink ..\..\..\boost\mpl\print.hpp
Hardlink created for ..\..\..\boost\mpl\print.hpp <<===>>
..\..\mpl\include\boost\mpl\print.hpp

<snip>

link.rm ..\..\..\boost\numeric\conversion
link.hardlink ..\..\..\boost\numeric\conversion\conversion_traits.hpp
The system cannot find the path specified.

    if exist "..\..\..\boost\numeric\conversion\conversion_traits.hpp"
del "..\..\..\boost\numeric\conversion\conversion
_traits.hpp"
    mklink /H "..\..\..\boost\numeric\conversion\conversion_traits.hpp"
"..\..\numeric\conversion\include\boost\numeric\
conversion\conversion_traits.hpp"

...failed link.hardlink
..\..\..\boost\numeric\conversion\conversion_traits.hpp...
link.hardlink ..\..\..\boost\numeric\conversion\int_float_mixture_enum.hpp
The system cannot find the path specified.

For some reason, b2 thinks it needs to rerun b2 headers, but it does a
crap job of it and dies. What's going on?

Eric