Calling D from C

[Alex Rønne Petersen]

On 12-03-2012 16:09, Chris W. wrote:
> On Monday, 12 March 2012 at 15:00:31 UTC, Steven Schveighoffer wrote:
>> On Mon, 12 Mar 2012 10:53:09 -0400, Chris W. <wendlec at cd.ie> wrote:
>>
>>> I have a problem when calling D functions from C. While I can
>>> perform simple arithmetic operations (i.e. the calculation is
>>> performed in D and returned to C), I experience problems when
>>> trying to perform string/char operations or call functions from
>>> the D standard library (e.g. writefln()). The usual error message
>>> I get is either "Bus error" or "Segmentation fault". I haven't
>>> been able to find the reason for this. The programs compile and
>>> link, however, when run, they terminate with "Bus error" whenever
>>> a D function is performed within the D code, e.g. something like
>>> char[] s2 = s.dup; (s is a char* passed from C). Any hint or help
>>> would be appreciated.
>>>
>>> I am using Mac OS X, 10.6.7
>>
>> If C is running your application startup, you must initialize D's
>> runtime from your C main routine.
>>
>> -Steve
>
> Yes, I am using extern (C) and in my C main function I call
>
> gc_init();
> thread_attachThis();
>
> This works fine for primitive types such as int + int calculations. But
> anything more sophisticated renders a Bus error. I am sure it is just
> some little detail I have forgotten.

Don't forget to call this: 
https://github.com/D-Programming-Language/druntime/blob/master/src/core/runtime.d#L33

Documented here: 
https://github.com/D-Programming-Language/druntime/blob/master/src/core/runtime.d#L101

-- 
- Alex