Cabal >= 3 does not pass through options to $CC correctly when building C code for FFI modules. #315
Description
A project built with llvm-hs gives an error like this in GHC 8.10.3:
Linking .stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0/build/<MyProject>/<MyProject> ...
ld.lld: error: undefined symbol: typeinfo for llvm::ErrorInfoBase
>>> referenced by BitcodeC.o:(typeinfo for llvm::ErrorInfo<llvm::ErrorList, llvm::ErrorInfoBase>) in archive <HOME>/.stack/snapshots/x86_64-linux-tinfo6/d1a1b99df71b047a18276db4b4d4dcaa7c67873cb82e9c6788ea3b790131ffee/8.10.3/lib/x86_64-linux-ghc-8.10.3/llvm-hs-9.0.1-1RtPvEeO6wN3mXnaO6NE50/libHSllvm-hs-9.0.1-1RtPvEeO6wN3mXnaO6NE50.a
collect2: error: ld returned 1 exit status
`gcc' failed in phase `Linker'. (Exit code: 1)
Completed 14 action(s).
-- While building package <MyProject>-0.1.0.0 (scroll up to its section to see the error) using:
<HOME>/.stack/setup-exe-cache/x86_64-linux-tinfo6/Cabal-simple_mPHDZzAJ_3.2.1.0_ghc-8.10.3 --builddir=.stack-work/dist/x86_64-linux-tinfo6/Cabal-3.2.1.0 build exe:<MyProject> --ghc-options " -fdiagnostics-color=always"
Process exited with code: ExitFailure 1
, though I'm not sure it is generally reproducible with other GHC 8.10 versions.
Is this expected?
(FYI, it works well with GHC 8.8.4)