Mingw objcopy failure

[markfinal]

In Test5, with this command line:

bam -o=build -b=Native --config=debug --config=profile -j=1 --clean --C.bitdepth=32 --C.toolchain=Mingw

I get this consistently on Windows 8.1

C:\MinGW\bin\objcopy.exe --add-gnu-debuglink=c:\dev\BuildAMation\tests\Test5\build\DebugSymbols-Profile\MyDynamicLibTestApp.exe.debug c:\dev\BuildAMa
tion\tests\Test5\build\Stripped-Profile\MyDynamicLibTestApp.exe
C:\MinGW\bin\objcopy.exe: warning: could not create temporary file whilst copying 'c:\dev\BuildAMation\tests\Test5\build\Stripped-Profile\MyDynamicLib
TestApp.exe', (error: Invalid argument)

[markfinal]

This is specific to binutils 2.25.1.
In 2.24, this did not happen.