Building RTEMS 4.12 for ARM using source builder fails

[Brendan McNally]

Hello -

Noob here, attempting to build RTEMS tools using the Source Builder for the
ARM architecture. I'm hoping someone can steer me straight. Here's the
rundown:

Host:
Win10pro x64, using MSYS2 (20161025).

sb-check identified some early problems with my python installation. I had
originally installed Python 3.6.3 for windows from python.org, then -- when
that was unsuccessful (complained about .startswith() args) -- rolled back
to 2.7.14, also from python.org. This was also unsuccessful; sb-check
reported issues with host config. Uninstalled both of these, and installed
mingw64/python2 from msys2, per comments in source-builder/sb/windows.py,
and that allwed sb-check to complete successfully. Well, with one warning
about SVN.

     warning: exe: absolute exe found in path: (__svn) /usr/bin/svn

I attempt to build the tools using the following command:

    ../source-builder/sb-set-builder --log=l-arm.txt \
--prefix=$HOME/development/rtems/4.12 4.12/rtems-arm

and it fails building newlib with the following info:

   config: tools/rtems-gcc-7.2.0-newlib-2.5.0.20170922-1.cfg
   package:
arm-rtems4.12-gcc-7.2.0-newlib-2.5.0.20170922-x86_64-w64-mingw32-1
   building:
arm-rtems4.12-gcc-7.2.0-newlib-2.5.0.20170922-x86_64-w64-mingw32-1
   error: building arg7n2xwm1
   Build FAILED
     See error report:
rsb-report-arm-rtems4.12-gcc-7.2.0-newlib-2.5.0.20170922-x86_64-w64-mingw32-1.txt
   error: building arg7n2xwm1

I also tried building with the additional flag --jobs=none, and receive the
same error.

Looking in the report, it's complaining about an include file that cannot
be located.

In file included from
../../../../../../../../../../gcc-7.2.0/newlib/libm/machine/arm/s_ceil.c:39:0:

../../../../../../../../../../gcc-7.2.0/newlib/libm/machine/arm/../../math/s_ceil.c:23:10:
fatal error: fdlibm.h: No such file or directory

 #include "fdlibm.h"
          ^~~~~~~~~~
compilation terminated.

Full report is attached.

Thanks in advance,
Brendan
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