Problem with temporary files under Windows

[Brian Dessent]

Arjen Markus wrote:

> If I unset the environment variable TMP, then the following
> code fragment causes an access violation:
> 
>      open( 10, status = 'scratch' )
> 
> Apparently the value of the environment variable is used to
> determine where the temporary file should be, but if it does
> not exist, it leads to this error.

This is not gfortran-specific.  It has to do with libiberty's
choose_tmpdir() falling back to MinGW's definition of _P_tmpdir if no
suitable environment variable is set.

The problem was diagnosed and fixed in this thread, but I don't think
the fix was ever pushed upstream:
<http://thread.gmane.org/gmane.comp.gnu.mingw.user/26738/focus=26838>

You should ping that thread and urge them to contribute the change
otherwise it will continue to be broken.

Brian