fpm fails to compile projects in parallel: Fortran runtime error: File cannot be deleted (2)

[zoziha]

Description

@LKedward, as we described in #707 and #708, even if OMP critical is added to fpm, the current fpm will still occasionally report similar errors (the frequency is greatly reduced) when compiling in parallel:

At line 689 of file ..\src\fpm_filesystem.F90
Fortran runtime error: File cannot be deleted

We didn't think it through at that time, but I think I found the reason for this error. The reason may be that the ar program is compiling the link library by the *.resp file, but execute_command_line didn't wait for this process and starts to delete the *.resp file, so an error occurrs, since *.resp file is occupied and can not be deleted!
A reasonable solution is to add a wait to execute_command_line and then return. Hope I didn't understand anything wrong.

Expected Behaviour

fpm build successfully.

Version of fpm

0.7.0

Platform and Architecture

All platform

Additional Information

I already have a PR on the way to fix this.

[zoziha]

To track the solution, the final solution in #808 is:

Create a delete_file_win32 for Windows, it will delete the * .resp file normally, and ignore the returned error (iostat) if cannot delete the * .resp file, and overwrite (replace in open) the original * .resp the next time you run fpm build to generate * .resp.
The behavior of other systems has not changed, mainly to avoid the sudden strange experience of "File cannot be deleted" among Windows-fpm users. In fact, only Windows-fpm will use * .resp files.