Linking C libraries with DMD

[jmh530 via Digitalmars-d-learn]

On Thursday, 21 January 2016 at 22:54:26 UTC, Dibyendu Majumdar 
wrote:
> On Thursday, 21 January 2016 at 22:49:06 UTC, jmh530 wrote:
>>
>> I'm not trying to created a shared library in D. My goal is to 
>> use a shared library from C in D. Right now, I'm working with 
>> a simple test case to make sure I could understand it before 
>> working with the actual shared library I want to use.
>>
>> I recall some discussion in LearningD (don't have it in front 
>> of me now) that different types of shared libraries are needed 
>> on 32bit vs. 64bit because there is a different linker. This 
>> is what I did to created the shared library:
>>
>> gcc -Wall -fPIC -c <file>.c -I.
>> gcc -shared -o <libfile>.dll <file>.o -I.
>> implib <libfile>.lib <libfile>.dll
>
> Okay then you don't need the /IMPLIB option. But you do need to 
> specify the library via -L as I mentioned before.
>
> i.e. use:
>
> dmd -m64 -L/LIBPATH:<path to lib> -L<library name> prog.d
>
> Where <library name> is yourlib.lib and this is present along 
> with the DLL in the path you gave.
>
> Plus your prog.d needs to have appropriate code. Example:
>
> module app;
>
> extern (C) void testing();
>
> void main()
> {
> 	testing();
> }
>
> Here testing() is provided in the DLL.

I ran

dmd -m64 <file>.d -L/LIBPATH:<path to lib> -L<library name>

and got

<library name> : fatal error LNK1136: invalid or corrupt file
--- errorlevel 1136

At least that's progress.

LNK1136 is for a corrupt or abnormally small file. I did notice 
that the original dll was 82kb and the lib file was 2kb.