Error: an attribute list cannot appear here JSON_HEDLEY_DEPRECATED_FOR

[SylvainCorlay]

With nlohmann_json 3.8 and 3.9, including 3.9.1 (but not with earlier versions such as 3.7), we are getting the following error in our builds on OS X (xcode 8).

/Users/travis/miniconda/envs/xtl/include/nlohmann/json.hpp:23086:5: error: an attribute list cannot appear here
    JSON_HEDLEY_DEPRECATED_FOR(3.8.0, parse(ptr, ptr + len))

• latest release version 3.9.1
• other release - please state the version: 3.8.x, 3.9.x
• the develop branch

[SylvainCorlay]

A failing build when removing the constraints nlohmann_json<3.7:

xtensor-stack/xtl#196

[nlohmann]

Which compiler and operating system are you using? Is it a supported compiler?

[SylvainCorlay]

Ok, it seems that you dropped support for xcode 8. Sorry for the noise.

[nlohmann]

No, no compiler support was consciously dropped. This seems to be an issue with Hedley. I will check.

[nlohmann]

So which exact compiler did you use?

[SylvainCorlay]

I was using the clang from the travis "xcode8" OS X image.

[nlohmann]

That image seems to be a bit abandoned by Travis and Homebrew. I am currently struggling to install CMake and Ninja there, so I'm not close to the error you reported yet...

[SylvainCorlay]

I just triggered a buld with xcode 8 for xtl: xtensor-stack/xtl#199

This should show the issue.

Note: we are seeing this in other repositories, because we have the same pattern in many where we install our dependencies from conda.

[nlohmann]

Also using Hedley?

[SylvainCorlay]

We are not using Hedley.

[SylvainCorlay]

Here is the failing build: https://travis-ci.com/github/xtensor-stack/xtl/jobs/369629906

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ketgo]

I am also getting the same issue with clang-3.6. In fact all my clang builds are failing. Is that compiler not supported?

[t-b]

@ketgo Which json version are you using? Does it include 411fc32?

[ketgo]

@t-b No it does not. I am using v3.9.1

[nlohmann]

Can you please try again with the develop branch?

[JuanGarcia345]

@nlohmann the version in the develop branch works for me. I had the same issue with clang-3.[6-8].

By the way, thank you for the job you have done with this nice library.

[davidbrochart]

Can you please try again with the develop branch?

I have the same issue, and it was solved by using the develop branch.

[davidbrochart]

Switching from Xcode 8 to Xcode 9 in Travis CI also solves the issue.

[ketgo]

develop branch worked for me. Thanks for the great package! :)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.