"Spontaneously" our VB6 build has started failing with the following error in one project out of several:
Unexpected error occurred in code generator or linker.
fatal error C1083: Cannot open compiler generated file: 'D:\path\to\file\frmSomeForm.OBJ': No such file or directory
The form in question is not a new addition and hasn't even been modified.
The PC is not out of disk space or anything like that.
It turns out that another developer changed the Path32 line in the project's VBP file to a local path which does not exist on the build machine. Changing it back to the correct value (which is supposed to be a relative path) resolved the issue.
It might also be relevant that the nonexistent path was on a nonexisting drive. (There was no D: drive though the path used this).
(Surprisingly, I couldn't find another example of this in the web so I've added it here... I wanted to look up any official specification for Path32 but I can't find it in https://learn.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/visual-basic-6.0-documentation or anywhere else.)