ghc option "-ddump-splices" is cached and ignored in subsequent calls to "cabal build"

[chreekat]

Description

The ghc option -ddump-splices is cached and subsequently ignored.

i.e. in a clean project, cabal build --ghc-options=-ddump-splices will enable the option for all subsequent calls to cabal build, whether or not the option is specified.

Likewise, an initial cabal build will cause later invocations of cabal build --ghc-options=-ddump-splices to ignore the option and continue to not dump splices.

To Reproduce

(Sorry, don't have an easy reproducer at hand, though I think it should be easy to create one)

Expected behavior

I would expect -ddump-splices to be treated as something like a verbosity flag. It should only affect the current run. It shouldn't affect recompilation: compiled things should stay compiled.

System information

• NixOS 23.05
• cabal 3.10.1.0
• ghc 9.2.8

[Mikolaj]

I think this is related to the list of GHC flags that tells cabal for which to recompile, but it's not just ddump-splices on the list. Perhaps there is. or we need. another list, which tells for which options to reconfigure or something like that. Or just reconfigure for all, because it's cheap and does not wipe out the cache.

[gbaz]

related #7973

[chreekat]

Related #10782 (comment)