[Haskell-cafe] Error trying to build haskell-dbus on FreeBSD

[Gleb Popov]

On Sat, Feb 1, 2020 at 5:31 AM Simon Jakobi via Haskell-Cafe <
haskell-cafe at haskell.org> wrote:

> Maybe. Though it seems to me that the pre-processor isn't missing, but
> it's doing the wrong thing…
>
> I'd suggest to open an issue at
> https://gitlab.haskell.org/ghc/ghc/issues – there should be people who
> can tell more exactly what's going wrong here.
>

Yep, the problem is with Clang's preprocessor. Running it manually results
in a bunch of

    warning: missing terminating ' character [-Winvalid-pp-token]

messages.

Stumbling upon a ' character makes cpp stop preprocessing current macro.
This is the case for IsValue instance, which contain typeOf' method.

Not sure if this should be reported to the package developer, GHC devs or
Clang devs.


> Am Sa., 1. Feb. 2020 um 02:16 Uhr schrieb Brandon Martin
> <brandon at codedmart.com>:
> >
> > Hmm... maybe I am missing a package in FreeBSD then? Is that the
> possible suggestion?
> >
> > --
> > Brandon Martin
> >
> > On Fri, Jan 31, 2020, at 5:12 PM, Simon Jakobi wrote:
> > > I think the error suggests that the C pre-processor doesn't work as
> > > expected. Look at the source around the error locations:
> > >
> > >
> https://github.com/rblaze/haskell-dbus/blob/43b1382ce93f08272fd6fda253d977f604214b2e/lib/DBus/Internal/Types.hs#L452-L481
> > >
> > > "HsType" is a variable name used in the CPP definition.
> > >
> > > Am Sa., 1. Feb. 2020 um 01:58 Uhr schrieb Brandon Martin
> > > <brandon at codedmart.com>:
> > > >
> > > > Yes I am. I put allow newer in both because stack complained about
> dependencies, and suggested it. I just put it in as a quick test to see if
> I could build it. Cabal didn't complain about dependencies, but got the
> same error.
> > > >
> > > > --
> > > > Brandon Martin
> > > >
> > > > On Fri, Jan 31, 2020, at 4:55 PM, Simon Jakobi wrote:
> > > > > Are you using the same dependency set (including GHC version) that
> you
> > > > > used on Linux too?
> > > > >
> > > > > Why did you enable allow-newer?
> > > > >
> > > > > Am Sa., 1. Feb. 2020 um 01:30 Uhr schrieb Brandon Martin
> > > > > <brandon at codedmart.com>:
> > > > > >
> > > > > > I am trying to build haskell-dbus on FreeBSD 12.1. I have tried
> with stack 2.1.3.1, and with cabal 2.4.0.0. I am seeing this error:
> > > > > >
> > > > > > Not in scope: type constructor or class ‘HsType’
> > > > > >
> > > > > > Full error:
> https://gist.github.com/codedmart/2b04438566ed8e985d909db7d426649c
> > > > > >
> > > > > > HsType is part of ghc unless I am missing something. I am new to
> using FreeBSD as I usually use Linux. This package builds fine for me on
> Linux.
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > --
> > > > > > Brandon Martin
> > > > > >
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> > >
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