Can't use ccls with ESP32 related projects

[Aaron-Uriel-Guzman-Cardoso]

Hi, I'm working with on a project, this project uses PlatformIO and is targeted to an ESP32, as a recomendation from this website I installed and compiled ccls version "0.20230717" with the LLVM that Espessif provides in version "16.0.4-20231113". I noticed it worked on simple projects that do not have anything related to PlatformIO or the ESP-IDF but on projects that do have something related to the ESP32, it throws a bunch of errors on the Neovim side.
This is the command that I used to make the compilation:

cmake -H. -Brelease-xtensa -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH=rest/of/the/path/llvm-esp-16.0.4-20231113-linux-amd64/esp-clang/

Indexing a project like the hello_world example of the ESP-IDF does not show any problem:

❯ ~/path/to/ccls/release-xtensa/ccls --index=. --init="{\"compilationDatabaseDirectory\": \"build\"}"
13:27:08 ccls           initialize.cc:276 I initialize in directory /home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world with uri file:///home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world/.
13:27:08 ccls           initialize.cc:299 I initializationOptions: {"compilationDatabaseCommand":"","compilationDatabaseDirectory":"build","cache":{"directory":".ccls-cache","format":"binary","hierarchicalPath":false,"retainInMemory":2},"capabilities":{"documentOnTypeFormattingProvider":{"firstTriggerCharacter":"}","moreTriggerCharacter":[]},"foldingRangeProvider":true,"workspace":{"workspaceFolders":{"supported":true,"changeNotifications":true}}},"clang":{"excludeArgs":[],"extraArgs":[],"pathMappings":[],"resourceDir":""},"client":{"diagnosticsRelatedInformation":true,"hierarchicalDocumentSymbolSupport":true,"linkSupport":true,"snippetSupport":true},"codeLens":{"localVariables":true},"completion":{"caseSensitivity":2,"detailedLabel":true,"dropOldRequests":true,"duplicateOptional":true,"filterAndSort":true,"include":{"blacklist":[],"maxPathSize":30,"suffixWhitelist":[".h",".hpp",".hh",".inc"],"whitelist":[]},"maxNum":100,"placeholder":true},"diagnostics":{"blacklist":[],"onChange":1000,"onOpen":0,"onSave":0,"spellChecking":true,"whitelist":[]},"highlight":{"largeFileSize":2097152,"lsRanges":false,"blacklist":[],"whitelist":[]},"index":{"blacklist":[],"comments":2,"initialNoLinkage":false,"initialBlacklist":[],"initialWhitelist":[],"maxInitializerLines":5,"multiVersion":0,"multiVersionBlacklist":[],"multiVersionWhitelist":[],"name":{"suppressUnwrittenScope":false},"onChange":false,"parametersInDeclarations":true,"threads":0,"trackDependency":2,"whitelist":[]},"request":{"timeout":5000},"session":{"maxNum":10},"workspaceSymbol":{"caseSensitivity":1,"maxNum":1000,"sort":true},"xref":{"maxNum":2000}}
13:27:08 ccls           initialize.cc:331 I use -resource-dir=/home/auriel/Documentos/Códigos/llvm-esp-16.0.4-20231113-linux-amd64/esp-clang/lib/clang/16
13:27:08 ccls           initialize.cc:363 I workspace folder: /home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world/
13:27:08 ccls              project.cc:429 I loaded /home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world/build/compile_commands.json
13:27:08 ccls              project.cc:284 I use /home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world/.ccls: %compile_commands.json --target=xtensa-esp32 --gcc-toolchain=/home/auriel/.espressif/tools/xtensa-esp-elf/esp-13.2.0_20230928/xtensa-esp-elf/
13:27:08 ccls           initialize.cc:388 I start 2 indexers
13:27:08 ccls           initialize.cc:396 I dispatch initial index requests
entries:    832
completed:    0/83213:27:08 indexer0         pipeline.cc:386 I delete /home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world/build/project_elf_src_esp32.c
completed:   77/83213:27:09 indexer0         pipeline.cc:386 I delete /home/auriel/Documentos/esp-idf-v5.2/examples/get-started/hello_world/build/x509_crt_bundle.S
completed:  832/832

However the cache directory is empty:

du -hs .ccls-cache/

Neovim

When I open neovim I get a bunch of errors like this:

LSP[ccls]: Error NO_RESULT_CALLBACK_FOUND: {                                                                                                                                              
  error = {
    code = -32603,
    message = "failed to index /home/auriel/Documentos/esp-idf-v5.2/components/xtensa/eri.c"
  },
  id = 1,
  jsonrpc = "2.0"
}

I added the last lines of the log file "/home/user/.local/state/nvim/lsp.log" in this report:
lsp_log.txt

This is the setting that I have on nvim-lspconfig:

    lspconfig["ccls"].setup {
      cmd = { "/home/user/path/ccls/release-xtensa/ccls" },
      init_options = {
        compilationDatabaseDirectory = "build",
        index = {
          threads = 0,
        },
        clang = {
          excludeArgs = { "-frounding-math"}
        },
      },
      capabilities = capabilities,
    }

I noticed that the error "No callback found for server response id 1" is repeated a lot and searching I found this Issue that suggest this is a specific ccls problem.

As a result I don't get any autocompletion, so I thought reporting this could be useful.