Temporary Files (GNAT User’s Guide for Native Platforms)

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7.4.4 Temporary Files ¶

It is possible to control where temporary files gets created by setting the TMP environment variable. The file will be created:

Under the directory pointed to by the TMP environment variable if this directory exists.
Under c:\temp, if the TMP environment variable is not set (or not pointing to a directory) and if this directory exists.
Under the current working directory otherwise.

This allows you to determine exactly where the temporary file will be created. This is particularly useful in networked environments where you may not have write access to some directories.