[R-package] CRAN issue with unqualified call to 'std::move'

[shiyu1994]

Description

I got another email from CRAN on 1st Jan for the warning message about using std::move.

[????????? [ripley@stats.ox.ac.uk](mailto:ripley@stats.ox.ac.uk) ????????? https://aka.ms/LearnAboutSenderIdentification?????????????]

Dear maintainer,

Please see the problems shown on
<https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcran.r-project.org%2Fweb%2Fchecks%2Fcheck_results_lightgbm.html&data=05%7C01%7Cyushi2%40microsoft.com%7C49c424fd62d04f5b8b4f08daebe41f99%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638081662299407642%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=nUv6e%2FkMPULboNqb%2BRsp8uJgpeM%2FkBNeCt3%2FmGwtKFk%3D&reserved=0>.

Please correct before 2023-01-15 to safely retain your package on CRAN.

The CRAN Team

For the ease of access, the URL is copied below
https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcran.r-project.org%2Fweb%2Fchecks%2Fcheck_results_lightgbm.html&data=05%7C01%7Cyushi2%40microsoft.com%7C49c424fd62d04f5b8b4f08daebe41f99%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C638081662299407642%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=nUv6e%2FkMPULboNqb%2BRsp8uJgpeM%2FkBNeCt3%2FmGwtKFk%3D&reserved=0

[jameslamb]

Thank you for sharing this! I can work on it today.

Can't believe we need to do another one of these 😫

[jameslamb]

The specific errors CRAN is telling us about are as follows.

Version: 3.3.4
Check: whether package can be installed
Result: WARN
    Found the following significant warnings:
     io/json11.cpp:207:47: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:216:51: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:225:53: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:268:60: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:272:36: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:276:37: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:381:41: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
     io/json11.cpp:150:39: warning: unqualified call to 'std::move' [-Wunqualified-std-cast-call]
    See ‘/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/lightgbm.Rcheck/00install.out’ for details.
    * used C++ compiler: ‘Debian clang version 15.0.6’

Those are showing up on the r-devel-linux-x86_64-debian-clang and r-devel-linux-x86_64-fedora-clang CRAN check flavors.

Seems that CRAN is using clang-15 in those tests, as seen at https://cran.r-project.org/web/checks/check_flavors.html#r-devel-linux-x86_64-debian-clang.

But in the image LightGBM uses in its CI to try to replicate that (rhub/debian-clang-devel), we're getting an older version of clang.

docker run \
    --rm \
    rhub/debian-clang-devel \
    clang --version

returns

Debian clang version 14.0.6
Target: x86_64-pc-linux-gnu
Thread model: posix

I've reported that upstream, at r-hub/rhub-linux-builders#63.

And I see other reports about this type of warning being caused by -Wunqualified-std-cast-call in LLVM/clang 15.x.

• https://bugs.mysql.com/bug.php?id=108870
• third party: add -Wno-unqualified-std-cast-call to fix json11 build commaai/openpilot#25686
  • ^this is even about the exact same JSON-parsing code from DropBox that we're getting a warning about
• https://www.mail-archive.com/cfe-commits@lists.llvm.org/msg267993.html
• Unqualified call to std::move in node_http2.cc nodejs/node#45543

I'll put up a fix here shortly.

[github-actions]

This issue has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.