[clangd] [lrt] [Vulkan-hpp] LanguageClient clangd for lrt crashes in a project with vulkan-hpp

[Txordi00]

I constantly get the following crashes:

LanguageClient clangd for lrt: The command "/usr/lib64/llvm20/bin/clangd --background-index --header-insertion=never --limit-results=100 --limit-references=0 --clang-tidy=0 --background-index-priority=low --rename-file-limit=0 --compile-commands-dir=/home/jordi/Documents/lrt/build/Desktop-Debug/.qtc_clangd --use-dirty-headers" terminated abnormally. (see logs in "/tmp/QtCreator-lBaaPB/lspclient.ghxeeY.log")
LanguageClient clangd for lrt: Unexpectedly finished. Restarting in 5 seconds.

in a project which uses the vulkan-hpp helper library. It happens when trying to autocomplete functions from certain headers, in this case, vulkan_funcs.hpp. I know when it's about to happen because the autocompletion preview shows the functions without arguments. It makes Qt Creator crash and it's extremely annoying. I attach the log here. Maybe the mistake is on my end and I have something not properly configured? The code compiles alright both with gcc and clang.

lspclient.ghxeeY.log

My setup is Fedora 42 + cmake 3.31.6 + gpp-15.1.1

[llvmbot]

@llvm/issue-subscribers-clangd

Author: None (Txordi00)

I constantly get the following crashes: ``` LanguageClient clangd for lrt: The command "/usr/lib64/llvm20/bin/clangd --background-index --header-insertion=never --limit-results=100 --limit-references=0 --clang-tidy=0 --background-index-priority=low --rename-file-limit=0 --compile-commands-dir=/home/jordi/Documents/lrt/build/Desktop-Debug/.qtc_clangd --use-dirty-headers" terminated abnormally. (see logs in "/tmp/QtCreator-lBaaPB/lspclient.ghxeeY.log") LanguageClient clangd for lrt: Unexpectedly finished. Restarting in 5 seconds. ``` in a project which uses the vulkan-hpp helper library. It happens when trying to autocomplete functions from certain headers, in this case, `vulkan_funcs.hpp`. I know when it's about to happen because the autocompletion preview shows the functions without arguments. It makes Qt Creator crash and it's extremely annoying. I attach the log here. Maybe the mistake is on my end and I have something not properly configured? The code compiles alright both with gcc and clang.

lspclient.ghxeeY.log

[Txordi00]

For completion, I have the suspicion that the issue may be on my CMakeLists.txt. I can not set it up for vulkan-hpp as in the official documentation https://github.com/KhronosGroup/Vulkan-Hpp?tab=readme-ov-file#usage-with-cmake:

CMake Error in CMakeLists.txt:
  The target named "VulkanHppModule" has C++ sources that may use modules,
  but modules are not supported by this generator:

    Unix Makefiles

  Modules are supported only by Ninja, Ninja Multi-Config, and Visual Studio
  generators for VS 17.4 and newer.  See the cmake-cxxmodules(7) manual for
  details.  Use the CMAKE_CXX_SCAN_FOR_MODULES variable to enable or disable
  scanning.

Setting CMAKE_CXX_SCAN_FOR_MODULES on does not work in my setup. Instead, I kept it easy and went ahead only with:

find_package(Vulkan REQUIRED)
target_link_libraries(${PROJECT_NAME} Vulkan::Vulkan)

Which compiles properly. But maybe there is some fetching that clangd cannot conduct because something is missing? Probably I am speaking nonsense already...

EDIT: Using ninja as a build system allows to set up cmake as in the official documentation but does not solve the above mentioned crashes. I attach the log of the same crash obtained with the VulkanHppModule library configured in cmake and clang-20.1.3 as the compiler.

lspclient.ccBHHw.log

[HighCommander4]

Based on the stack trace, I believe this is also #139019.

[Txordi00]

Based on the stack trace, I believe this is also #139019.

Thanks for answering! I will follow that thread then :)