Word of warning: The support for C++ in both cabal and GHC is currently at a level were it cannot be sanely used. You can use it in the "mad cackling, slowly losing your mind too Lovecraftian horrors"-way, but if you care about things like "actually using the right C++ compiler" or "using the same C++ stdlib your other code was built with", you are as the professionals put it SOL. - Merijn

On 24 Jun 2021, at 14:47, Mikolaj Konarski wrote:

HI David,

It wouldn't hurt to try a newer cabal. I know a similar problem with `extra-source-files` has been fixed recently.

If it still doesn't work in cabal 3.4, please search the issues and file one or add a suitable emoji to an existing one.

Cheers, Mikolaj

On Thu, Jun 24, 2021 at 2:30 PM David Banas wrote:

...

Using Cabal v3.2.0.0 and with the following stanza in my *.cabal file:

executable ex9 import: shared-properties main-is: src/ex/ex9.hs cxx-sources: src/ex/ex9.cpp {snip}

if I edit the file: `src/ex/ex9.cpp`, and then execute: `cabal build`, I'm told:

$ cabal build Up to date

Is this a known issue? Is there a workaround?

Thanks, -db

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