clangd: openmp pragmas break clangd behavior (e.g. go-to-def, rename) on symbols inside parallel loop

When using OpenMP #pragmas, clangd’s jump to definition, rename, doesn’t work for variables or functions.

I found this error while using clangd as a C++ LSP in neovim editor.

Here’s a proof of concept C++ code showing the error …

    int j = 88, k = 99;
    #pragma omp parallel for
    for(int i = 0; i < 10; i++)
    {
        printf("%d\n", k); // ERROR: Does not jump to k or rename symbol k
    }
    printf("%d\n", j); // CORRECT: Does jump to j and rename symbol j

Clangd breaks down inside the for loop. I can’t jump to k, or rename it. I can’t also jump to the definition of function printf inside the loop.

But outside the loop, I can jump to definition of j and also rename it. Also, I can jump to definition of function printf.

The error is clearly due to the pragma, as if I comment the pragma line out, then everything works correctly again for both k, j, and printf.

Logs

I don’t know how to get the clangd logs in neovim right now.

System information

I installed clangd in neovim using Mason, and the clangd version is: 15.0.6

Editor/LSP plugin: Neovim v0.9.0-dev

NVIM v0.9.0-dev
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/cc -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wdouble-promotion -Wmissing-noreturn -Wmissing-format-attribute -Wmissing-prototypes -Wno-unused-result -Wimplicit-fallthrough -Wvla -fno-common -fdiagnostics-color=auto -fstack-protector-strong -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DMIN_LOG_LEVEL=3 -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_TS_HAS_SET_MATCH_LIMIT -DNVIM_TS_HAS_SET_ALLOCATOR -DNVIM_UNIBI_HAS_VAR_FROM -I/usr/include/luajit-2.1 -I/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/build/src/nvim/auto -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/build/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/build/cmake.config -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/src -I/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include -I/build/neovim-kqgxhc/neovim-0.9.0~ubuntu1+git202303031604-6d4f48182-333b5866f/.deps/usr/include

Operating system: Linux. Ubuntu 20.04.1