[imath] Avoid conflicts between openexr and imath

[fabiencastan]

Describe the pull request

Imath is included in openexr and the install of imath or openexr will overide the other one.
So, currently the system is broken and we cannot install both openexr and alembic, as it will end up in 2 differents versions mixed up.

• What does your PR fix?

Use openexr which contains the latest version of imath.

• Which triplets are supported/not supported? Have you updated the [CI baseline]

Does not change anything.

• Does your PR follow the maintainer guide?

Yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

Not yet, I would like to get feedback.

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When making any changes to a library, the version or port-version in vcpkg.json or CONTROL must be modified.

error: checked-in files for opencolorio have changed but the version was not updated
version: 2.1.2
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***No files were updated***
error: checked-in files for alembic have changed but the version was not updated
version: 1.8.3#1
old SHA: 16bef528ef38e7426a333739878188d9ca909bc5
new SHA: 955d7dbf5f765fb910fbcc92b2f47f588d4517a3
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[dg0yt]

I think this PR is invalid. (The problem is valid, but the solution will be different.)

Use openexr which contains the latest version of imath.

Actually port imath is the latest version. Port openexr in vcpkg is an older version, which includes an older version of imath.

You can install both ports at the same time, but you can't use them at the same time.
For this reason, you currently cannot install openimageio[opencolorio] with the latest versions of these ports, because opencolorio was updated to use the new imath while openimageio still uses the outdated openexr.
However, in manifest mode, you could request an old, compatible version of opencolorio.
There is a version check added as a patch to openimageio:

vcpkg/ports/openimageio/imath-version-guard.patch

Lines 9 to 13 in 55112eb

	+if(USE_OPENCOLORIO AND TARGET Imath::Imath AND OIIO_USING_IMATH STREQUAL "2")
	+ message(FATAL_ERROR
	+ "OpenColorIO and OpenEXR use incompatible versions of Imath. "
	+ "You cannot use openimageio[opencolorio] for this configuration.")
	+endif()

The ultimate solution is to update openexr to version 3. There have been two attempts already, but they are somewhat stuck due to depending ports not being ready for the update. And vcpgk makes it hard to have an openexr3 (or openexr2) in addition to openexr. But you know that, as you commented on these PRs.

[xchen31u]

Hi, please accelerate this if possible; is breaking OpenColorIO

[LilyWangLL]

Please don't just remove this port, add set(VCPKG_POLICY_EMPTY_PACKAGE enabled) here, and add openexr to imath's dependency in vcpkg.json.
You can refer the change of PR #26655.

[dg0yt]

This part is invalid anyways. Imath is separate from openexr 3.
This whole PR is obsolete with #26862.

[LilyWangLL]

I think this PR is invalid. (The problem is valid, but the solution will be different.)

Use openexr which contains the latest version of imath.

Actually port imath is the latest version. Port openexr in vcpkg is an older version, which includes an older version of imath.

You can install both ports at the same time, but you can't use them at the same time. For this reason, you currently cannot install openimageio[opencolorio] with the latest versions of these ports, because opencolorio was updated to use the new imath while openimageio still uses the outdated openexr. However, in manifest mode, you could request an old, compatible version of opencolorio. There is a version check added as a patch to openimageio:

vcpkg/ports/openimageio/imath-version-guard.patch

Lines 9 to 13 in 55112eb

	+if(USE_OPENCOLORIO AND TARGET Imath::Imath AND OIIO_USING_IMATH STREQUAL "2")
	+ message(FATAL_ERROR
	+ "OpenColorIO and OpenEXR use incompatible versions of Imath. "
	+ "You cannot use openimageio[opencolorio] for this configuration.")
	+endif()

The ultimate solution is to update openexr to version 3. There have been two attempts already, but they are somewhat stuck due to depending ports not being ready for the update. And vcpgk makes it hard to have an openexr3 (or openexr2) in addition to openexr. But you know that, as you commented on these PRs.

Ping @fabiencastan for response.

[LilyWangLL]

Ping @fabiencastan for response. Is work still being done for this PR?

[dg0yt]

Ping @fabiencastan for response. Is work still being done for this PR?

I hope not. Cf. #26513 (comment).

[fabiencastan]

No, everything is working fine with the great work to move to openexr-3!