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

[Ben Franksen]

Am 01.02.20 um 11:36 schrieb 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.

This situation strikes me as being precarious. It means we rely on the
gcc developers to retain the -traditional flag (with its current
semantics). My personal experience makes me think that such reliance is
ill-advised: breaking compatibility with anything other than C or C++
source code is not regarded as a problem and bug reports to that effect
are rejected as invalid.

Cheers
Ben
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