clangd: Eclipse indexer unable to find std or the first C++ include in files

I am running Eclipse version 2023-09 (4.29.0) and have the Espressif ESP-IDF plugin version 2.11.1.202310270725 installed.

I installed the clangd indexer and disabled the default indexer per the instructions at this link. The installation of the clangd indexer went smoothly, but to get it to take effect, I had to delete my project and re-import it.

My first problem with the indexer is that it seems to have trouble finding standard C++ headers. It says “Use of undeclared identifier ‘std’” when I reference an std library method.

It also claims it can’t find the string header file as indicated below. I noticed that this happens with the first #include in the file. So if I first #include <memory> then #include <string> it will indicate memory cannot be found but it finds string. Weird.

FInally, I also don’t see any context menu commands for “Open declaration”. The other indexer supported it. Is that feature unavailable with the clangd indexer?

I’ve attached the Eclipse log. eclipse.log