Dynamic libraries, again

[Jacob Carlborg]

On 3/14/10 23:36, Walter Bright wrote:
> Jacob Carlborg wrote:
>> I've been working the whole day on getting Tango to work built as a
>> dynamic library with dmd on Mac OS X. I have one problem (for now)
>> that I can't seem to solve.
>>
>> The problem is that the module constructors are not called. That is
>> because the module info array in the object module, which contains all
>> the module constructors that should be called, is (almost) empty. It
>> seems like that the compiler or the linker doesn't put the module
>> constructors that are dynamically linked into the executable. I've
>> also tried to move the _minfo_beg and _minfo_end variables, which are
>> the beginning and the end of the sections containing the module info
>> array, from the object module to a statically linked module and then
>> passed them as arguments to the _moduleCtor function but without any
>> success.
>>
>> Does anyone have any idea have to solve the above problem? Does the
>> compiler need to be modified?
>
> There will be an _minfo_beg and _minfo_end for each loaded shared
> library. These must then be combined at runtime to form an aggregate
> array of all the modules.
>
> I don't know how to search the shared libraries to find the
> _minfo_beg/end sections, though I've never researched it, either.

Latest update:
I've found the __minfodata section and the content looks fine. The new 
problem I have is that an exception is thrown in _moduleCtor2 and I 
can't catch the exception. The problem is that it can't find any handler 
table. I think it's something wrong with _deh_beg and _deh_end in the 
deh module.

If I have the _deh_beg and _deh_end as globals (as they are by default) 
it doesn't find a handler table. If I instead get the __deh_beg and the 
__deh_end sections from the main executable it does find a table handler 
but the table looks very different compared to a statically linked 
Tango. The length of the table is close to 600 compared to 1 when Tango 
is statically linked. It also contains a lot of zeros.