Re: link problem with Visual Studio 2012


Paul Miller <pa...@...>
 

On 12/5/2016 4:12 PM, Dithermaster wrote:
Is this 32-bit or 64-bit? If 32-bit, did you change the default calling
convention in your project (__cdecl vs __stdcall)? Undecorated headers
with .lib files that use the default convention will fail if you've
changed the default convention. In 64-bit this is moot since it's
all __fastcall.
No, 64 bit only.

I used the default cmake settings, though I did run cmake and build with cygwin in my path (so "patch" would work when building tinyxml).

I'll look into the v0 vs v1 issue - that looks like it may be the culprit.


On Mon, Dec 5, 2016 at 12:42 PM, Jeremy Selan <jeremy...@...
<mailto:jeremy...@...>> wrote:

Are you using the proper generated headers? Are you overriding so
version in CMake?

All the symbols are in OpenColorIO::v0, and I would expect them to
be in v1 (corresponding to the major version).

See https://github.com/imageworks/OpenColorIO/blob/master/export/OpenColorIO/OpenColorABI.h.in
<https://github.com/imageworks/OpenColorIO/blob/master/export/OpenColorIO/OpenColorABI.h.in>

#define OCIO_NAMESPACE_ENTER namespace OCIO_NAMESPACE { namespace
OCIO_VERSION_NS

#define OCIO_VERSION_NS v@SOVERSION@


https://github.com/imageworks/OpenColorIO/blob/master/CMakeLists.txt
<https://github.com/imageworks/OpenColorIO/blob/master/CMakeLists.txt>
set(OCIO_VERSION_MAJOR 1)
set(OCIO_VERSION_MINOR 0)
set(OCIO_VERSION_PATCH 9)


set(SOVERSION ${OCIO_VERSION_MAJOR}CACHESTRING "Set the SO version
in the SO name of the output library")



On Mon, Dec 5, 2016 at 10:24 AM, Paul Miller <pa...@...
<mailto:pa...@...>> wrote:

I'm in the twilight zone today. After a bad merge from
Mac->Windows, my application will no longer link against the
shared OpenColorIO.lib on Windows, using Visual Studio 2012.
This is the exact same set of headers and .lib I've been using
for over a year.

The link errors are all like this one:

error LNK2019: unresolved external symbol "__declspec(dllimport)
public: static int __cdecl
OpenColorIO::v0::FileTransform::getNumFormats(void)"
(__imp_?getNumFormats@FileTransform@v0@OpenColorIO@@SAHXZ)

and there seems to be an error for every OCIO function or
definition I make use of, including:

error LNK2001: unresolved external symbol "__declspec(dllimport)
char const * const OpenColorIO::v0::ROLE_DATA"
(__imp_?ROLE_DATA@v0@OpenColorIO@@3PEBDEB)
error LNK2001: unresolved external symbol "__declspec(dllimport)
char const * const OpenColorIO::v0::ROLE_COLOR_PICKING"
(__imp_?ROLE_COLOR_PICKING@v0@OpenColorIO@@3PEBDEB)
error LNK2001: unresolved external symbol "__declspec(dllimport)
char const * const OpenColorIO::v0::ROLE_SCENE_LINEAR"
(__imp_?ROLE_SCENE_LINEAR@v0@OpenColorIO@@3PEBDEB)

Just for fun I cloned the current OCIO master branch, ran cmake
on it, and rebuilt. I did have to make one change to
OpenColorABI.h, and that is to get it to use <memory> and
std::shared_ptr instead of boost or the tr1 stuff:

#elif defined(_LIBCPP_VERSION) || defined(WIN32)
#include <memory>
#define OCIO_SHARED_PTR std::shared_ptr
#define OCIO_DYNAMIC_POINTER_CAST std::dynamic_pointer_cast

But that's a minor change.

I'm linking with OpenColorIO.lib, but the linker is acting like
nothing is being exported from it.

Has anyone else experienced anything like this?

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