getExecutablePath from System.Environment in base should follow symlinks properly.

During the implementation of relocation capabilities in GHC for linux and macOS it came to light, that windows (which has had this support for quite some time), uses a custom implementation of getExecutablePath.

Ideally this logic should be moved into base. Phyx- noted in D4121 that this should be possible for 8.6, as at that point Win32 should be new enough to be usable in base for this.

The result would be that the custom code in GHC (SysTools) and the older copy in GhcPkg of the same code can be unified with the linux and macOS CPP conditional branch.

Trac metadata

Trac field	Value
Version	8.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	Phyx-, bgamari
Operating system
Architecture