How to keep temporary files on build failures?

[nh2]

In a project where my build is failing, I'm trying to inspect the intermediate files that GHC generates.

I tried

stack build --ghc-options=-keep-tmp-files

but it doesn't work, because while GHC doesn't delete its temp files, stack does.

I think it's because of this:

stack/src/Stack/Build/Execute.hs

Lines 326 to 327 in b48f18f

	withExecuteEnv bopts boptsCli baseConfigOpts locals globalPackages snapshotPackages localPackages inner =
	withSystemTempDir stackProgName $ \tmpdir -> do

Is there a way I can convince stack to keep the temporary directory for inspection? If not, I'd like to feature request that.

[nh2]

PR at #3858