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

[Merijn Verstraaten]

> On 1 Feb 2020, at 10:01, Viktor Dukhovni <ietf-dane at dukhovni.org> wrote:
> 
> The package developer.  Neither GHC nor Clang are at-fault for invalid
> CPP macro syntax.

This isn't the package developers fault. Standard Haskell just cannot be properly preprocessed by an ISO C preprocessor. As the definition of valid tokens just aren't compatible.

GHC's use of the CPP has long (maybe since forever?) been incompatible with CPP as standardised in the ISO C spec, and its relies on the -traditional flag to make GCC use it's pre-ISO C implementations. This flag isn't necessarily portable across C compilers and I recall this breaking things in the past.

cpphs should work as a workaround alternative C preprocessor if your C compiler doesn't support the "right" wrong CPP configuration.

Cheers,
Merijn
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