PCM file not found

[belmakier]

[x] Checked for duplicates

Describe the bug

Error message

Error in <TCling::LoadPCM>: ROOT PCM <root_build_directory/bin/library_rdict.pcm> file does not exist

is printed when a dynamic library is loaded in the ROOT prompt, even when the appropriate *_rdict.pcm file exists in the same directory as the library.

Expected behavior

ROOT should search both the $LD_LIBRARY_PATH and the directory where the library is located for the *_rdict.pcm file.

To Reproduce

Load a dynamic library with
gROOT->ProcessLine(".L path_to_library.dylib")
or equivalent

Setup

1. ROOT 6.27/01
2. macOS 11.4
3. built from source

[belmakier]

As far as I can tell, this is related to the following snippet from here.

  // Handle path list items
  for (auto item : p) {
    if (item.startswith(".")) {
      if (item == "..") {
        size_t s = result.rfind(sep);
        if (s != llvm::StringRef::npos) result.resize(s);
        if (result.empty()) result = sep;
      }
      continue;  
    } else if (item == "~") {
      continue;
    }

The absolute path to my library contains a hidden file ($HOME/.local), so when the path is iterated through it skips over any directory starting with a period character. If I remove the first continue statement above, it seems to work fine.

Tim

[Axel-Naumann]

Wow, well done, Tim, thanks so much for your help with debugging this! I'll check what this code is meant to do.

[Axel-Naumann]

That's #9911 !

[Axel-Naumann]

Merged, thanks for reporting. Do you need this in the upcoming 6.26 or in 6.24, or is it enough to fix this in master and the future 6.28?

[belmakier]

It's not urgent, I can wait for 6.28. Thanks!

[Axel-Naumann]

Thanks!