[ci] [R-package] clang18 jobs failing: _mm_malloc compilation errors about lightgbm HOT 2 CLOSED

I do see one copy of libstdc++.so.1.

find / -name 'libc++.so.1'
# /usr/lib/llvm-18/lib/libc++.so.1

And it looks like clang++-18 is a symlink to that location.

which clang++-18
# /usr/bin/clang++-18

stat /usr/bin/clang++-18

  File: /usr/bin/clang++-18 -> ../lib/llvm-18/bin/clang++
  Size: 26              Blocks: 0          IO Block: 4096   symbolic link
Device: 65h/101d        Inode: 1428380     Links: 1
Access: (0777/lrwxrwxrwx)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2024-07-14 19:13:14.000000000 +0000
Modify: 2024-07-14 19:13:14.000000000 +0000
Change: 2024-07-18 01:22:36.113571002 +0000
 Birth: 2024-07-18 01:22:36.113571002 +0000

Helping the linker find that library resolves the issues.

LD_LIBRARY_PATH="/usr/lib/llvm-18/lib:${LD_LIBRARY_PATH}" \
R CMD INSTALL ./lightgbm_4.4.0.99.tar.gz

But that really shouldn't be necessary (and isn't in any of the other clang{nn} images from r-hub). I'll put up a PR here to temporarily resolve it and unblock CI, and report this in the repo where the images are built.

from lightgbm.

upstream report: r-hub/containers#70

PR to unblock CI: #6554

from lightgbm.