Fix tmp files being created in project directory

[sumukhballal]

Issue number:

Closes #180

Description of changes:

This issue is probably reproducible on every variant (tested on 1) when SIGINT or SIGSTP (or SIGTERM) is called on the build process in a linux host, temp files are not cleared. This is expected behavior as per https://docs.rs/tempfile/latest/tempfile/struct.TempDir.html#resource-leaking as the destructors are never called. The build.rs where these files are created are here.

Instead we will create these files under /tmp as suggested by @webern . This allows us to keep the current build directory clean.

Testing done:

When a SIGINT or SIGSTP (ctrl+c and ctrl+z) is called, I see the file created in the tmp directory. For example:

/tmp/.tmpXYZ

When no such interruption is provided, watching a directory, I see a file created, then deleted eventually when it goes out of scope.

Every 2.0s: ls -a | grep "^\.tmp"                                                                                             Wed May  8 09:45:02 2024

.tmpi6qmGD
.tmpM1RQq1

But eventually it was cleared

Every 2.0s: ls -a | grep "^\.tmp"                                                                                             Wed May  8 09:45:02 2024

.tmpM1RQq1

Terms of contribution:

By submitting this pull request, I agree that this contribution is dual-licensed under the terms of both the Apache License, version 2.0, and the MIT license.