On Windows, Mingw interprets all parameters starting with '/' as paths, and replaces the '/' with its home directory, "C:\Windows\msys\". This was a problem in h5diff tests such as:
h5diff h5diff_101.txt $FILE1 $FILE1 /g1/d1 g1/d2 -v
I've removed the leading '/', as h5diff will interpret it the same either way.
Tested:
kagiso, linew, and smirom, via h5committest
mingw on Windows XP
Added a relative error formula to deal with floating point uncertainty
in the comparison of floats and double types.
Added new tests for this feature to the file generator program and to
the shell script
