CODEWITHSUNDEEP
c++gccdirectx-11
Orwell
Orwell

Reputation: 1518

Creating correct D3D11 library file for GCC

What is the correct way to convert files like d3d11.lib that are provided in the DirectX SDK to the *.a GCC library format? I've tried the common reimp method for converting *.lib files to *.a files, but it doesn't seem to work.

Step one involves creating a definitions file:

bin\reimp -d d3d11.lib

Let's say I want to use the D3D11CreateDevice function that should be provided in this library. If I open the created definitions file everything seems to be OK:

LIBRARY "d3d11.dll"
EXPORTS
(...)
D3D11CreateDevice
D3D11CreateDeviceAndSwapChain
(...)

Next I try to create the *.a file using the definitions file and the original lib file:

bin\dlltool -v -d d3d11.def -l libd3d11.a

This does in fact produce a valid library (and no error messages when dlltool is set to verbose), but if I try to use the function D3D11CreateDevice that should be implemented in it, I get an error:

undefined reference to `D3D11CreateDevice'

If I ask nm what symbol are present in the library (and filter using grep), I get this:

D:\Tools\LIB2A>bin\nm libd3d11.a | grep D3D11CreateDevice
File STDIN:
00000000 I __imp__D3D11CreateDeviceAndSwapChain
00000000 T _D3D11CreateDeviceAndSwapChain
00000000 I __imp__D3D11CreateDevice
00000000 T _D3D11CreateDevice

The imp function is the function that calls the actual implementation of D3D11CreateDevice inside the DLL. However, that actual implementation is now prefixed by an underscore.

Why is "_D3D11CreateDevice" defined while "D3D11CreateDevice" is not even though it is mentioned in the definitions file?

Upvotes: 2

Views: 1507

Answers (2)

Orwell
Orwell

Reputation: 1518

An outdated version of dlltool will prepend an underscore to every function when converting d3d11lib. Solved it by using a dlltool.exe from MinGW-w64 4.9.2. This dlltool produces a library with the correct function names.

When using the regular d3d11.lib provided by Microsoft in combination with headers provided by anyone, a SIGSEGV will occur when stepping into the library at runtime. This means that you do have to convert to the *.a format for some reason not investigated.

Upvotes: 0

Ross Ridge
Ross Ridge

Reputation: 39581

Just do:

copy d3d11.lib libd3d11.a

Alternatively you use X:\path\to\d3d11.lib on the GCC command line instead of -ld3d11. The GNU utilities on Windows use the same PECOFF archive format that Microsoft's tools use.

Upvotes: 2

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