Way `--enable-library-bytecode` is not honoured by `repl`

[fendor]

Describe the bug

On cabal HEAD (4f927a1), the way modifier --enable-library-bytecode has no impact when run with repl

To Reproduce

$ cabal init --lib -n --no-comments
$ cabal repl -w ghc-10.1 --enable-library-bytecode
Warning: Parsing the index cache failed (Data.Binary.Get.runGet at position
Build profile: -w ghc-10.1.20260530 -O1
In order, the following will be built (use -v for more details):
 - bytecode-repo-0.1.0.0 (interactive) (lib) (first run)
Configuring library for bytecode-repo-0.1.0.0...
Preprocessing library for bytecode-repo-0.1.0.0...
GHCi, version 10.1.20260530: https://www.haskell.org/ghc/  :? for help
Using language edition: Haskell2010
[1 of 1] Compiling MyLib            ( src/MyLib.hs, interpreted )[bytecode-repo-0.1.0.0-inplace]
Ok, one module loaded.
ghci> :q
Leaving GHCi.

Calling it twice in a row doesn't work either.

To produce the .gbc files, you first need to build the project:

$ cabal build -w ghc-10.1 --enable-library-bytecode
Build profile: -w ghc-10.1.20260530 -O1
In order, the following will be built (use -v for more details):
 - bytecode-repo-0.1.0.0 (lib) (configuration changed)
Configuring library for bytecode-repo-0.1.0.0...
Preprocessing library for bytecode-repo-0.1.0.0...
Building library for bytecode-repo-0.1.0.0...
[1 of 1] Compiling MyLib            ( src/MyLib.hs, dist-newstyle/build/x86_64-linux/ghc-10.1.20260530/bytecode-repo-0.1.0.0/build/MyLib.o, dist-newstyle/build/x86_64-linux/ghc-10.1.20260530/bytecode-repo-0.1.0.0/build/MyLib.dyn_o, dist-newstyle/build/x86_64-linux/ghc-10.1.20260530/bytecode-repo-0.1.0.0/build/MyLib.gbc )

Expected behavior

Calling cabal repl --enable-library-bytecode should, in my opinion, generate .gbc files. Calling cabal repl --enable-library-bytecode twice in a row, the second call should be much faster.

System information

• Operating system
• cabal, ghc versions

Additional context
Add any other context about the problem here.

[fendor]

FYI, I think I will need a bytecode artefact label or something of the sort :D This might not be the last one.

[ffaf1]

I created one.

I think to use bytecode libs from repl, you need -fprefer-byte-code in any case.

[fendor]

For the record, I needed

> cabal repl -w ghc-10.1 --enable-library-bytecode all  --enable-multi-repl --ghc-options="-fprefer-byte-code -fwrite-byte-code -fwrite-interface"

To actually make it pick up the .gbc files.

Even then, it wasn't picking up the existing .gbc files but created new ones.

So, there seems to be an issue with the ways .gbc files are created.