Ghcide: cpp-options: ["-std=c99"] lead to target ‘-std=c99’ is not a module name or a source file

[alaendle]

Very simple reproduction - just create a new project (via stack new) and add the line cpp-options: ["-std=c99"]. Afterwards start ghcide and it will produce the mentioned error.

For now I keep short, but please don't hesitate to ask if I could provide further information or clarify things.

[ndmitchell]

My guess is this is really a hie-bios issue, but will need tracking down first to confirm.