clangd Ubuntu 22.04 - C++ header file not found using Vim with YouCompleteMe

Hi, I have one PC (Ubunto 22.04) and one laptop (Ubuntu 22.04). Both have YouCompleteMe installed. The above issue only happens to the PC. I don' face this issue with the laptop. The error i am getting example 'vector file not found [pp_file_not_found]' in the VIM when editing a C++ program. I have been using YouCompleteMe on both PC and laptop without issue for more than 1 year but just found out today it's no longer working on my PC. I have attached both logs from the PC and laptop. I did a comparison between them and it looks pretty much similar aside from the clang version.

Note for both PC & laptop:

Editor: Vim v8.
OS: Ubuntu 22.04
Both PC & laptop never had clangd installed
Both PC & laptop never had clang installed

(yapkm01-/tmp):-$ clangd (PC & laptop) Command 'clangd' not found, but can be installed with: sudo snap install clangd # version 6.0.0+git2102885, or sudo apt install clangd # version 1:14.0-55~exp2 See 'snap info clangd' for additional versions. (yapkm01-/tmp):-$

clang (PC & laptop)

(yapkm01-/tmp):-$ clang Command 'clang' not found, but can be installed with: sudo apt install clang

vim 9_38.cc

#include <vector>
#include <iostream>
using namespace std;
  
 int main(){
    vector<string> v;
    for (string buffer; cin >> buffer;) {
         v.push_back(buffer);
        cout << v.capacity() << endl;
    }
      return 0;
}

PC Logs (Problematc one):

-rw------- 1 yapkm01 yapkm01 81 Nov 26 23:16 ycm_oo6s2_v4.log -rw------- 1 yapkm01 yapkm01 34 Nov 26 23:16 ycmd_43113_stdout_a7spn9fo.log -rw-rw-r-- 1 yapkm01 yapkm01 223808 Nov 26 23:16 preamble-524f48.pch -rw------- 1 yapkm01 yapkm01 1417 Nov 26 23:16 clangd_stderr4vdaydqk.log -rw------- 1 yapkm01 yapkm01 3469 Nov 26 23:18 ycmd_43113_stderr_bt1_lqds.log

(yapkm01-/tmp):-$ cat ycm_oo6s2_v4.log 2022-11-26 23:16:34,709 - ERROR - <urlopen error [Errno 111] Connection refused>

(yapkm01-/tmp):-$ cat ycmd_43113_stdout_a7spn9fo.log serving on http://localhost:43113

(yapkm01-/tmp):-$ cat clangd_stderr4vdaydqk.log I[23:16:34.866] clangd version 15.0.1 (https://github.com/ycm-core/llvm 708056a3d8259ce1d9fc0f15676d13b53cc23835) I[23:16:34.866] Features: linux I[23:16:34.866] PID: 11031 I[23:16:34.866] Working directory: /home/yapkm01/Software.Development/C++Primer/chapter9 I[23:16:34.866] argv[0]: /home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd I[23:16:34.866] argv[1]: -header-insertion-decorators=0 I[23:16:34.866] argv[2]: -resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 I[23:16:34.866] argv[3]: -limit-results=500 I[23:16:34.866] Starting LSP over stdin/stdout I[23:16:34.867] <-- initialize(1) I[23:16:34.868] --> reply:initialize(1) 0 ms I[23:16:34.869] <-- initialized I[23:16:34.869] <-- workspace/didChangeConfiguration I[23:16:34.869] <-- textDocument/didOpen I[23:16:34.870] Failed to find compilation database for /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc I[23:16:34.870] ASTWorker building file /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc version 1 with command clangd fallback [/home/yapkm01/Software.Development/C++Primer/chapter9] /usr/bin/clang -resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 -- /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc I[23:16:34.881] --> textDocument/publishDiagnostics

(yapkm01-/tmp):-$ cat ycmd_43113_stderr_bt1_lqds.log 2022-11-26 23:16:34,711 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:16:34,711 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:16:34,711 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:16:34,711 - INFO - Completion config: 50, detailing 0 candiates 127.0.0.1 - - [26/Nov/2022 23:16:34] "GET /ready HTTP/1.1" 200 4 2022-11-26 23:16:34,818 - INFO - Adding buffer identifiers for file: /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc 2022-11-26 23:16:34,857 - INFO - Clangd executable found at /home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin and up to date 2022-11-26 23:16:34,858 - INFO - Using Clangd from /home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd 2022-11-26 23:16:34,858 - INFO - Computed Clangd command: ['/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1', '-limit-results=500'] 2022-11-26 23:16:34,858 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:16:34,858 - INFO - Returning cached Clangd command: ['/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1', '-limit-results=500'] 2022-11-26 23:16:34,859 - INFO - Starting Clangd: ['/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1', '-limit-results=500'] 127.0.0.1 - - [26/Nov/2022 23:16:34] "GET /signature_help_available?subserver=cpp HTTP/1.1" 200 23 127.0.0.1 - - [26/Nov/2022 23:16:34] "POST /event_notification HTTP/1.1" 200 2 2022-11-26 23:16:34,861 - INFO - Clangd started with PID 11031 127.0.0.1 - - [26/Nov/2022 23:16:34] "POST /event_notification HTTP/1.1" 200 2 2022-11-26 23:16:34,868 - INFO - cfamily: Language server does not require resolve request 2022-11-26 23:16:34,868 - INFO - cfamily: Language server requires sync type of Incremental 2022-11-26 23:16:34,868 - INFO - cfamily: Using characters for signature triggers: (,),{,},<,>,, 127.0.0.1 - - [26/Nov/2022 23:16:34] "POST /receive_messages HTTP/1.1" 200 5063 127.0.0.1 - - [26/Nov/2022 23:16:34] "POST /semantic_completion_available HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:16:41] "POST /debug_info HTTP/1.1" 200 881 127.0.0.1 - - [26/Nov/2022 23:16:45] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:16:55] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:17:05] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:17:15] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:17:25] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:17:35] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:17:45] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:17:55] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:18:05] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:18:15] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:18:25] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:18:35] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:18:45] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:18:55] "POST /receive_messages HTTP/1.1" 200 4

LAPTOP logs (No issue one):

-rw------- 1 yapkm01 yapkm01 81 Nov 26 23:52 ycm_9vgtaolj.log -rw------- 1 yapkm01 yapkm01 34 Nov 26 23:52 ycmd_54349_stdout_cuzmw0lr.log -rw-rw-r-- 1 yapkm01 yapkm01 2855480 Nov 26 23:52 preamble-162cf9.pch -rw------- 1 yapkm01 yapkm01 1416 Nov 26 23:52 clangd_stderre3ce17de.log -rw------- 1 yapkm01 yapkm01 10838 Nov 27 00:10 ycmd_54349_stderr_phvl244j.log

(yapkm01-/tmp):-$ cat ycm_9vgtaolj.log 2022-11-26 23:52:30,682 - ERROR - <urlopen error [Errno 111] Connection refused>

(yapkm01-/tmp):-$ cat ycmd_54349_stdout_cuzmw0lr.log serving on http://localhost:54349

(yapkm01-/tmp):-$ cat clangd_stderre3ce17de.log I[23:52:30.849] clangd version 13.0.0 (https://github.com/ycm-core/llvm 02d1fa3185f1beeebb182b8911bfe09d3429707f) I[23:52:30.849] Features: linux I[23:52:30.849] PID: 6143 I[23:52:30.849] Working directory: /home/yapkm01/Software.Development/C++Primer/chapter9 I[23:52:30.849] argv[0]: /home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd I[23:52:30.849] argv[1]: -header-insertion-decorators=0 I[23:52:30.849] argv[2]: -resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/13.0.0 I[23:52:30.849] argv[3]: -limit-results=500 I[23:52:30.849] Starting LSP over stdin/stdout I[23:52:30.849] <-- initialize(1) I[23:52:30.850] --> reply:initialize(1) 0 ms I[23:52:30.851] <-- initialized I[23:52:30.851] <-- workspace/didChangeConfiguration I[23:52:30.852] <-- textDocument/didOpen I[23:52:30.853] Failed to find compilation database for /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc I[23:52:30.853] ASTWorker building file /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc version 1 with command clangd fallback [/home/yapkm01/Software.Development/C++Primer/chapter9] /usr/bin/clang -resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/13.0.0 -- /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc I[23:52:31.607] --> textDocument/publishDiagnostics

(yapkm01-/tmp):-$ cat ycmd_54349_stderr_phvl244j.log 2022-11-26 23:52:30,771 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:52:30,771 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:52:30,771 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:52:30,772 - INFO - Completion config: 50, detailing 0 candiates 127.0.0.1 - - [26/Nov/2022 23:52:30] "GET /ready HTTP/1.1" 200 4 2022-11-26 23:52:30,796 - INFO - Adding buffer identifiers for file: /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc 2022-11-26 23:52:30,838 - INFO - Clangd executable found at /home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin and up to date 2022-11-26 23:52:30,838 - INFO - Using Clangd from /home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd 2022-11-26 23:52:30,838 - INFO - Computed Clangd command: ['/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/13.0.0', '-limit-results=500'] 2022-11-26 23:52:30,838 - INFO - Completion config: 50, detailing 0 candiates 2022-11-26 23:52:30,839 - INFO - Returning cached Clangd command: ['/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/13.0.0', '-limit-results=500'] 127.0.0.1 - - [26/Nov/2022 23:52:30] "GET /signature_help_available?subserver=cpp HTTP/1.1" 200 23 127.0.0.1 - - [26/Nov/2022 23:52:30] "POST /event_notification HTTP/1.1" 200 2 2022-11-26 23:52:30,840 - INFO - Starting Clangd: ['/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/13.0.0', '-limit-results=500'] 2022-11-26 23:52:30,843 - INFO - Clangd started with PID 6143 127.0.0.1 - - [26/Nov/2022 23:52:30] "POST /event_notification HTTP/1.1" 200 2 2022-11-26 23:52:30,850 - INFO - cfamily: Language server does not require resolve request 2022-11-26 23:52:30,851 - INFO - cfamily: Language server requires sync type of Incremental 2022-11-26 23:52:30,851 - INFO - cfamily: Using characters for signature triggers: (,, 127.0.0.1 - - [26/Nov/2022 23:52:30] "POST /semantic_completion_available HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:52:31] "POST /receive_messages HTTP/1.1" 200 95 127.0.0.1 - - [26/Nov/2022 23:52:36] "POST /debug_info HTTP/1.1" 200 880 127.0.0.1 - - [26/Nov/2022 23:52:41] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:52:51] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:53:01] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:53:11] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:53:21] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:53:32] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:53:42] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:53:52] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:54:02] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:54:12] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:54:22] "POST /receive_messages HTTP/1.1" 200 4 127.0.0.1 - - [26/Nov/2022 23:54:32] "POST /receive_messages HTTP/1.1" 200 4

Nov 27 '22 03:11 yapkm01

It looks like clangd is not able to find the standard library headers of your compiler.

What compiler are you using to build you code? Where is the compiler executable located in the fileystem?

Using --query-driver as described at https://clangd.llvm.org/troubleshooting#cant-find-standard-library-headers-map-stdioh-etc usually works as a workaround in situations like this, but note that in clangd 15 it requires your project having a compile_commands.json (this is improved in clangd 16).

Nov 27 '22 05:11 HighCommander4

If you're able to configure YouCompleteMe to pass --log=verbose as a command-line argument to clangd, then sharing the clangd_stderr log taken with that flag might shed more light on the situation.

Nov 27 '22 05:11 HighCommander4

Please see my revise information. I am using g++ (/usr/bin/g++). Initially one on PC was using clangd 13 but because it didn't work i downloaded the latest YouCompleteMe which uses clangd 15.

Nov 27 '22 05:11 yapkm01

Can you share the output of /usr/bin/g++ -v -x c++ -E /dev/null please?

Nov 27 '22 05:11 HighCommander4

Btw. https://github.com/clangd/vscode-clangd/issues/417 is similar, I think something related to the location of the standard library include paths changed in Ubuntu 22.04.

Nov 27 '22 05:11 HighCommander4

Can you share the output of /usr/bin/g++ -v -x c++ -E /dev/null please?

Here it is for the one on PC (problematic one):

(yapkm01-/tmp):-$ uname -a
Linux yapkm01-m3a78-cm 5.17.2-051702-generic #202204081338 SMP PREEMPT Fri Apr 8 13:43:51 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
(yapkm01-/tmp):-$

(yapkm01-/tmp):-$ /usr/bin/g++ -v -x c++ -E /dev/null
Using built-in specs.
COLLECT_GCC=/usr/bin/g++
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.3.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-11-xKiWfi/gcc-11-11.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-xKiWfi/gcc-11-11.3.0/debian/tmp-gcn/usr --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04) 
COLLECT_GCC_OPTIONS='-v' '-E' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE /dev/null -mtune=generic -march=x86-64 -fasynchronous-unwind-tables -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection -fcf-protection -dumpbase null
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/11"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/11
 /usr/include/x86_64-linux-gnu/c++/11
 /usr/include/c++/11/backward
 /usr/lib/gcc/x86_64-linux-gnu/11/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
# 0 "/dev/null"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 0 "<command-line>" 2
# 1 "/dev/null"
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-E' '-shared-libgcc' '-mtune=generic' '-march=x86-64'

Here is the one on laptop (no issue one):

yapkm01-/home/yapkm01/Software.Development/C++Primer/chapter9):-$ uname -a
Linux yapkm01-F55C 5.17.2-051702-generic #202204081338 SMP PREEMPT Fri Apr 8 13:43:51 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

(yapkm01-/home/yapkm01/Software.Development/C++Primer/chapter9):-$ /usr/bin/g++ -v -x c++ -E /dev/null
Using built-in specs.
COLLECT_GCC=/usr/bin/g++
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.3.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-11-xKiWfi/gcc-11-11.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-xKiWfi/gcc-11-11.3.0/debian/tmp-gcn/usr --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04) 
COLLECT_GCC_OPTIONS='-v' '-E' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE /dev/null -mtune=generic -march=x86-64 -fasynchronous-unwind-tables -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection -fcf-protection -dumpbase null
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/11"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/11
 /usr/include/x86_64-linux-gnu/c++/11
 /usr/include/c++/11/backward
 /usr/lib/gcc/x86_64-linux-gnu/11/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
# 0 "/dev/null"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 0 "<command-line>" 2
# 1 "/dev/null"
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-E' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
(yapkm01-/home/yapkm01/Software.Development/C++Primer/chapter9):-$

Nov 27 '22 05:11 yapkm01

If you're able to configure YouCompleteMe to pass --log=verbose as a command-line argument to clangd, then sharing the clangd_stderr log taken with that flag might shed more light on the situation.

I am not sure how/where/what to change here.

Nov 27 '22 05:11 yapkm01

Btw. clangd/vscode-clangd#417 is similar, I think something related to the location of the standard library include paths changed in Ubuntu 22.04.

Here's my issue. Both PC & laptop is on Ubuntu 22.04 yet one on laptop is working without problem. Not sure 100% but I noticed that this issue happens on my PC after i use VIM and did a colorscheme change. I didn't do that on my laptop and so far the YouCompleteMe is working there.

Nov 27 '22 05:11 yapkm01

Can you share the output of /usr/bin/g++ -v -x c++ -E /dev/null please?

Here it is.

Thanks. The listed include paths seem pretty standard, it's strange that clangd cannot find them.

Next diagnostic step would be to get verbose logs.

If you're able to configure YouCompleteMe to pass --log=verbose as a command-line argument to clangd, then sharing the clangd_stderr log taken with that flag might shed more light on the situation.

I am not sure how/where/what to change here.

I don't use YCM but some googling around took me to here which shows an example of setting ycm_clangd_args. Do that with --log=verbose as the argument.

Nov 27 '22 05:11 HighCommander4

Can you share the output of /usr/bin/g++ -v -x c++ -E /dev/null please?

Here it is.

Thanks. The listed include paths seem pretty standard, it's strange that clangd cannot find them.

Next diagnostic step would be to get verbose logs.

If you're able to configure YouCompleteMe to pass --log=verbose as a command-line argument to clangd, then sharing the clangd_stderr log taken with that flag might shed more light on the situation.

I am not sure how/where/what to change here.

I don't use YCM but some googling around took me to here which shows an example of setting ycm_clangd_args. Do that with --log=verbose as the argument.

OK. I'll try tomorrow. Appreciate.

Nov 27 '22 05:11 yapkm01

Hi! I can confirm I am having the same issue on the latest uptodate Ubuntu 22.04. I found out about this problem via YCM too. My /usr/bin/g++ -v -x c++ -E /dev/null output is:

Using built-in specs.
COLLECT_GCC=/usr/bin/g++
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.3.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-11-xKiWfi/gcc-11-11.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-11-xKiWfi/gcc-11-11.3.0/debian/tmp-gcn/usr --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.3.0 (Ubuntu 11.3.0-1ubuntu1~22.04) 
COLLECT_GCC_OPTIONS='-v' '-E' '-shared-libgcc' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/11/cc1plus -E -quiet -v -imultiarch x86_64-linux-gnu -D_GNU_SOURCE /dev/null -mtune=generic -march=x86-64 -fasynchronous-unwind-tables -fstack-protector-strong -Wformat -Wformat-security -fstack-clash-protection -fcf-protection -dumpbase null
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/11"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/include-fixed"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/11/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/c++/11
 /usr/include/x86_64-linux-gnu/c++/11
 /usr/include/c++/11/backward
 /usr/lib/gcc/x86_64-linux-gnu/11/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
# 0 "/dev/null"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 0 "<command-line>" 2
# 1 "/dev/null"
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/11/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-E' '-shared-libgcc' '-mtune=generic' '-march=x86-64'

YcmDebugInfo is:

Printing YouCompleteMe debug information...
-- Resolve completions: Up front
-- Client logfile: /tmp/ycm_g9r9jbae.log
-- Server Python interpreter: /usr/bin/python3
-- Server Python version: 3.10.6
-- Server has Clang support compiled in: True
-- Clang version: clang version 15.0.1 (https://github.com/ycm-core/llvm 708056a3d8259ce1d9fc0f15676d13b53cc23835)
-- No extra configuration file found
-- C-family completer debug information:
--   Clangd running
--   Clangd process ID: 5505
--   Clangd executable: ['/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/georgerapeanu/.vim/b
undle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1', '-limit-results=500']
--   Clangd logfiles:
--     /tmp/clangd_stderrenvqo00d.log
--   Clangd Server State: Initialized
--   Clangd Project Directory: /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8
--   Clangd Settings: {}
--   Clangd Compilation Command: False
-- Server running at: http://127.0.0.1:40395
-- Server process ID: 5486
-- Server logfiles:
--   /tmp/ycmd_40395_stdout_l418atm7.log
--   /tmp/ycmd_40395_stderr_txk76es8.log
-- Semantic highlighting supported: True
-- Virtual text supported: False
-- Popup windows supported: True

I manually extracted the following command via YcmDebugInfo:

'/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd', '-header-insertion-decorators=0', '-resource-dir=/home/georgerapeanu/.vim/b
undle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1', '-limit-results=500'

Executing it with --log=verbose gives

/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd -header-insertion-decorators=0 -resource-dir=/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 -limit-results=500 --check=test.cpp --log=verbose
I[10:15:34.764] clangd version 15.0.1 (https://github.com/ycm-core/llvm 708056a3d8259ce1d9fc0f15676d13b53cc23835)
I[10:15:34.765] Features: linux
I[10:15:34.765] PID: 5555
I[10:15:34.765] Working directory: /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8
I[10:15:34.765] argv[0]: /home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clangd/output/bin/clangd
I[10:15:34.765] argv[1]: -header-insertion-decorators=0
I[10:15:34.765] argv[2]: -resource-dir=/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1
I[10:15:34.765] argv[3]: -limit-results=500
I[10:15:34.766] argv[4]: --check=test.cpp
I[10:15:34.766] argv[5]: --log=verbose
V[10:15:34.766] User config file is /home/georgerapeanu/.config/clangd/config.yaml
I[10:15:34.766] Entering check mode (no LSP server)
I[10:15:34.766] Testing on source file /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp
I[10:15:34.767] Loading compilation database...
I[10:15:34.768] Failed to find compilation database for /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp
I[10:15:34.769] Generic fallback command is: /usr/lib/llvm-14/bin/clang -resource-dir=/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 -- /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp
I[10:15:34.770] Parsing command...
I[10:15:34.774] internal (cc1) args are: -cc1 -triple x86_64-unknown-linux-gnu -fsyntax-only -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -debugger-tuning=gdb -fcoverage-compilation-dir=/home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8 -resource-dir /home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++ -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/x86_64-linux-gnu -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/backward -internal-isystem /home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -fdebug-compilation-dir=/home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8 -ferror-limit 19 -fgnuc-version=4.2.1 -fcxx-exceptions -fexceptions -no-round-trip-args -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -x c++ /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp
I[10:15:34.774] Building preamble...
I[10:15:34.796] Indexing headers...
V[10:15:34.796] indexed preamble AST for /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp version null:
  symbol slab: 0 symbols, 120 bytes
  ref slab: 0 symbols, 0 refs, 128 bytes
  relations slab: 0 relations, 24 bytes
V[10:15:34.797] Built preamble of size 223792 for file /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp version null in 0.02 seconds
E[10:15:34.797] [pp_file_not_found] Line 1: 'iostream' file not found
I[10:15:34.797] Building AST...
E[10:15:34.811] [undeclared_var_use] Line 6: use of undeclared identifier 'cout'
I[10:15:34.811] Indexing AST...
V[10:15:34.812] indexed file AST for /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp version null:
  symbol slab: 1 symbols, 4448 bytes
  ref slab: 1 symbols, 1 refs, 4248 bytes
  relations slab: 0 relations, 24 bytes
V[10:15:34.812] Build dynamic index for main-file symbols with estimated memory usage of 11520 bytes
I[10:15:34.812] Building inlay hints
I[10:15:34.812] Testing features at each token (may be slow in large files)
V[10:15:34.812]   0:0 #
V[10:15:34.812]     definition: 0
V[10:15:34.813]     hover: false
V[10:15:34.813]     documentHighlight: 0
V[10:15:34.813]   0:1 include
V[10:15:34.813] No heuristic index definition for include
V[10:15:34.813]     definition: 0
V[10:15:34.813]     hover: false
V[10:15:34.813]     documentHighlight: 0
V[10:15:34.814]   0:9 <
V[10:15:34.814]     definition: 0
V[10:15:34.814]     hover: false
V[10:15:34.814]     documentHighlight: 0
V[10:15:34.814]   0:10 iostream
V[10:15:34.814] No heuristic index definition for iostream
V[10:15:34.814]     definition: 0
V[10:15:34.814]     hover: false
V[10:15:34.815]     documentHighlight: 0
V[10:15:34.815]   0:18 >
V[10:15:34.815] No heuristic index definition for iostream
V[10:15:34.815]     definition: 0
V[10:15:34.815]     hover: false
V[10:15:34.815]     documentHighlight: 0
V[10:15:34.815]   2:0 using
V[10:15:34.815]     tweak: RemoveUsingNamespace
V[10:15:34.816]     definition: 0
V[10:15:34.817]     hover: true
V[10:15:34.817]     documentHighlight: 0
V[10:15:34.817]   2:6 namespace
V[10:15:34.817]     tweak: RemoveUsingNamespace
V[10:15:34.817]     definition: 0
V[10:15:34.819]     hover: true
V[10:15:34.819]     documentHighlight: 0
V[10:15:34.819]   2:16 std
V[10:15:34.819]     tweak: RemoveUsingNamespace
V[10:15:34.819]     definition: 0
V[10:15:34.821]     hover: true
V[10:15:34.821]     documentHighlight: 0
V[10:15:34.821]   2:19 ;
V[10:15:34.821]     definition: 0
V[10:15:34.822]     hover: true
V[10:15:34.822]     documentHighlight: 0
V[10:15:34.822]   4:0 int
V[10:15:34.823]     definition: 0
V[10:15:34.823]     hover: false
V[10:15:34.823]     documentHighlight: 0
V[10:15:34.823]   4:4 main
V[10:15:34.823]     definition: 1
V[10:15:34.825]     hover: true
V[10:15:34.825]     documentHighlight: 1
V[10:15:34.825]   4:8 (
V[10:15:34.825]     definition: 1
V[10:15:34.825]     hover: false
V[10:15:34.825]     documentHighlight: 1
V[10:15:34.825]   4:9 )
V[10:15:34.826]     definition: 0
V[10:15:34.826]     hover: false
V[10:15:34.826]     documentHighlight: 0
V[10:15:34.826]   4:11 {
V[10:15:34.826]     definition: 0
V[10:15:34.826]     hover: false
V[10:15:34.826]     documentHighlight: 0
V[10:15:34.826]   5:2 cout
V[10:15:34.826]     definition: 0
V[10:15:34.827]     hover: false
V[10:15:34.827]     documentHighlight: 0
V[10:15:34.827]   5:7 <<
V[10:15:34.827]     definition: 0
V[10:15:34.827]     hover: false
V[10:15:34.827]     documentHighlight: 0
V[10:15:34.827]   5:10 "ok"
V[10:15:34.827]     definition: 0
V[10:15:34.827]     hover: false
V[10:15:34.827]     documentHighlight: 0
V[10:15:34.827]   5:14 ;
V[10:15:34.828]     definition: 0
V[10:15:34.828]     hover: false
V[10:15:34.828]     documentHighlight: 0
V[10:15:34.828]   6:2 return
V[10:15:34.828]     definition: 0
V[10:15:34.828]     hover: false
V[10:15:34.828]     documentHighlight: 1
V[10:15:34.828]   6:9 0
V[10:15:34.828]     tweak: ExtractVariable
V[10:15:34.829]     definition: 0
V[10:15:34.829]     hover: false
V[10:15:34.829]     documentHighlight: 0
V[10:15:34.829]   6:10 ;
V[10:15:34.829]     definition: 0
V[10:15:34.829]     hover: false
V[10:15:34.829]     documentHighlight: 0
V[10:15:34.829]   7:0 }
V[10:15:34.829]     definition: 0
V[10:15:34.829]     hover: false
V[10:15:34.829]     documentHighlight: 0
I[10:15:34.830] All checks completed, 2 errors

The test.cpp file is a simple c++ script:

#include <iostream>

using namespace std;

int main() {
  cout << "ok";
  return 0;
}

One of the contributors of YCM said that it seems that the include paths generated by the clagnd fallback flags no longer work on 22.04

Nov 27 '22 08:11 georgerapeanu

Can you explain more on the 'include paths generated by the clangd fallback flags no longer work on 22.04'? As explained above i have Ubuntu 22.04 installed on both PC & laptop. Yet one on laptop works without issue.

Based on your logs below, i presume you're referring to the below portion.

I[10:15:34.768] Failed to find compilation database for /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp
I[10:15:34.769] Generic fallback command is: /usr/lib/llvm-14/bin/clang -resource-dir=/home/georgerapeanu/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 -- /home/georgerapeanu/Desktop/petrozavodsk_summer_2019/day8/test.cpp
I[10:15:34.770] Parsing command...

Are you then saying the fallback failed because you don't have /usr/lib/llvm-14/bin/clang installed?

In my case it would be below.

I[23:16:34.870] ASTWorker building file /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc version 1 with command clangd fallback
[/home/yapkm01/Software.Development/C++Primer/chapter9]
/usr/bin/clang -resource-dir=/home/yapkm01/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/clang/lib/clang/15.0.1 -- /home/yapkm01/Software.Development/C++Primer/chapter9/9_38.cc

Does that mean mean /usr/bin/clang is missing which is the case on my PC (as explained above clang was never installed on both PC & laptop yet the latter works without issue)?

Can you elaborate more?

Nov 27 '22 13:11 yapkm01

I can't really explain anything because I too have the problem and do not know what is happening. I just added to the issue data from my laptop in order for the smarter guys to be able to understand better what is happening.

Nov 27 '22 13:11 georgerapeanu

Can you share the output of /usr/bin/g++ -v -x c++ -E /dev/null please?

Here it is.

Thanks. The listed include paths seem pretty standard, it's strange that clangd cannot find them.

Next diagnostic step would be to get verbose logs.

If you're able to configure YouCompleteMe to pass --log=verbose as a command-line argument to clangd, then sharing the clangd_stderr log taken with that flag might shed more light on the situation.

I am not sure how/where/what to change here.

I don't use YCM but some googling around took me to here which shows an example of setting ycm_clangd_args. Do that with --log=verbose as the argument.

Hi @HighCommander4 It seems @georgerapeanu has the logs which you need. Can you let us know what needs to be done to fix the issue? Appreciate much.

Nov 27 '22 13:11 yapkm01

I can't really explain anything because I too have the problem and do not know what is happening. I just added to the issue data from my laptop in order for the smarter guys to be able to understand better what is happening.

Thanks much! Think your logs would really help them.

Nov 27 '22 13:11 yapkm01

I have to run now, will take a more detailed look later, but based on a quick look at the logs + another recent issue I've seen, installing g++-12 may be an effective workaround.

Nov 27 '22 14:11 HighCommander4

I understand .. But again here's the puzzling part. My laptop running on Ubuntu 22.04 as well. It has the same g++ version as my PC which is 11. Guess what? It's working. No issue. I am working on it right now. No error saying e.g. "vector file not found [pp_file_not_found]". I know it doesn't make sense to you but it all started on my PC on Vim after i change the color scheme. Kick me in the ass .. LOL. I'll be attaching screenshot one on my laptop showing no issue running on Ubuntu 22.04

Nov 27 '22 15:11 yapkm01

Enclosed screenshot on my laptop which does not have this issue. Hope you can see it.

file:///home/yapkm01/Pictures/Screenshots/Screenshot%20from%202022-11-27%2010-18-44.png file:///home/yapkm01/Pictures/Screenshots/Screenshot%20from%202022-11-27%2010-19-06.png file:///home/yapkm01/Pictures/Screenshots/Screenshot%20from%202022-11-27%2010-19-27.png

Nov 27 '22 15:11 yapkm01

I was able to trivially repro this using the 'ubuntu 22.04' VM from my vagrant VMs : https://github.com/puremourning/VMs

cd ubutu-22.04-LTS
vagrant up (if any errors, just vagrant provision)
vagrant ssh
vim test.cc
#include <iostream>

expect no error actual file not found.

Workaround. Use the following compile_flags.txt:

vagrant@vagrant:~/YouCompleteMe$ cat compile_flags.txt
 -x
 c++
-std=c++17
-isystem
/usr/include/c++/11
-isystem
/usr/include/aarch64-linux-gnu/c++/11
-isystem
/usr/include/c++/11/backward
-isystem
/usr/lib/gcc/aarch64-linux-gnu/11/include
-isystem
/usr/local/include
-isystem
/usr/include/aarch64-linux-gnu
-isystem
/usr/include

Nov 27 '22 16:11 puremourning

Thanks for the tip @puremourning . Below what i did one on my PC.

a. Find where the include locations are.

(root-/):-$ find . -name vector -print
find: ‘./run/user/1000/doc’: Permission denied
find: ‘./run/user/1000/gvfs’: Permission denied
./usr/include/c++/10/vector
./usr/include/c++/10/experimental/vector
./usr/include/c++/10/debug/vector
./usr/include/c++/11/vector
./usr/include/c++/11/experimental/vector
./usr/include/c++/11/debug/vector
./usr/include/c++/9/profile/vector
./usr/include/c++/9/vector
./usr/include/c++/9/experimental/vector
./usr/include/c++/9/debug/vector
./usr/include/boost/fusion/container/vector
./usr/include/boost/mpl/vector

i choose to use ./usr/include/c++/11 location

b. Modify .ycm_extra_conf.py. Added the /usr/include/c++/11 to the last line below.

# THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won't know which
# language to use when compiling headers. So it will guess. Badly. So C++
# headers will be compiled as C headers. You don't want that so ALWAYS specify
# a "-std=<something>".
# For a C project, you would set this to something like 'c99' instead of
# 'c++11'.
'-std=c++11',

# ...and the same thing goes for the magic -x option which specifies the
# language that the files to be compiled are written in. This is mostly
# relevant for c++ headers.
# For a C project, you would set this to 'c' instead of 'c++'.
'-x', 'c',

'-I', '.',

'-I', './src/',

'-I', './include/',

'-I', './ClangCompleter',

'-isystem', '../llvm/include',

'-isystem', '../llvm/tools/clang/include',

'-isystem', './tests/gmock/gtest',

'-isystem', './tests/gmock/gtest/include',

'-isystem', './tests/gmock',

'-isystem', './tests/gmock/include',

'-isystem', '/usr/include',

'-isystem', '/usr/local/include',

'-isystem', '/usr/include/c++/11',

'-isystem', '/usr/include/c++/11/backward',

c. Recompiled

(yapkm01-/home/yapkm01/.vim/bundle/YouCompleteMe):-$ ./install.py --clangd-completer Generating ycmd build configuration...OK Compiling ycmd target: ycm_core...OK Setting up Clangd completer...OK

d. Same error on Vim

Nov 27 '22 16:11 yapkm01

There should be no need whatsoever to recompile ycmd. I have repeatedly said that this is nothing to do with YCM or ycmd.

If you do what I said (use a compile_flags.txt in the directory of your project), it will resolve the issue. Stop fidding with YCM/ycmd - it's completely irrelevant.

Nov 27 '22 17:11 puremourning

ok. I reverted back the original YCM. Below are all the compile_flags.txt. They are all under tests directory. That's all i find below. Which one i should be changing?

(yapkm01-/home/yapkm01/.vim/bundle/YouCompleteMe):-$ find . -name compile_flags.txt -print ./third_party/ycmd/ycmd/tests/clangd/testdata/compile_flags.txt ./third_party/ycmd/ycmd/tests/clangd/testdata/cuda/compile_flags.txt ./third_party/ycmd/ycmd/tests/clangd/testdata/driver_mode_cl/flag/compile_flags.txt ./third_party/ycmd/ycmd/tests/clangd/testdata/driver_mode_cl/executable/compile_flags.txt ./third_party/ycmd/ycmd/tests/clangd/testdata/test-include/compile_flags.txt ./third_party/ycmd/ycmd/tests/clangd/testdata/objc/compile_flags.txt

Nov 27 '22 17:11 yapkm01

None of them. Put the compile_flags.txt in the root of your project.

Please carefully read the clangd and YCM documentation. You do NOT need to change ANY files in the ycmd directory or the YCM directory..

I will not provide any further support on this issue as I consider it resolved (multiple times over).

Nov 27 '22 17:11 puremourning

based on a quick look at the logs + another recent issue I've seen, installing g++-12 may be an effective workaround.

Two users who reported a similar issue (in #1391 and https://github.com/clangd/vscode-clangd/issues/417) have reported that this workaround works.

My best guess as to how this problem arises on affected machines:

The affected machine has gcc-12 installed but not g++-12.
Since gcc-12 is installed, some paths related to gcc-12, for example /usr/lib/gcc/x86_64-linux-gnu/12, exist.
This fools the clang driver's heuristics for locating the standard library headers into thinking it will find gcc 12 standard library headers.
However, since g++-12 is not installed, the C++ standard library headers are not present.

Machines running Ubuntu 22.04 which are not affected probably either have g++-12 installed, or do not have gcc-12 installed.

With that in mind, a more complete set of workarounds:

Option 1 Install g++-12.
- This is the simplest solution. It does mean that clangd will use the gcc 12 standard library headers; this may be slightly sub-optimal in cases where your project is not actually built with gcc 12 (for example, code completion may offer standard library facilities present in version 12 but not in the version you're building with).
Option 2 Uninstall gcc-12.
- (But you may not be able to do this if another package you need depends on it.)
Option 3 Use --query-driver to instruct clangd to extract the built-in include paths of the compiler you're building with, rather than using heuristics to find them. Note that this requires that your project has a compile_commands.json, and that the argument to --query-driver match the argv[0] of the commands in the compile_commands.json.
Option 4 Provide the built-in include paths of your compiler to clangd manually, using a clangd config file or (for projects that don't use compile_commands.json) using compile_flags.txt. (This is the workaround @puremourning described.)

I think a proper fix would involve fixing the clang driver's heuristics for locating standard library paths, to handle this situation correctly. However, the code in question is not in clangd, it's upstream in libclangDriver, and I don't have the bandwidth to investigate it further at this time.

Nov 28 '22 07:11 HighCommander4

Thanks, Nathan. I’ll double check my VM to confirm about gcc installed/g++ not installed and report back.

Edit: confirmed.

specifically:

gcc 12 installed
g++ 12 NOT installed
gcc 11 installed
g++ 11 installed

i guess a recent update required gcc 12 and caused this discrepancy. Thanks for the investigation.

Nov 28 '22 08:11 puremourning

Same issue here, opened some C++ code in neovim and it says <iostream> is missing g++ (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0

Nov 30 '22 10:11 drzhivago420

I've narrowed down this problem to installation of libasan8 which is the dependency of gcc-12. I'm using Pop!_os and it's desktop has hard dependency on gcc-12, but on my home server with ubuntu as a container I'm free to remove it and clang is happy again. Installing libasan8 on itself triggers the problem even without gcc-12 installed

Dec 28 '22 00:12 smumriak

More generally, today I find that the clang++ compilers (version 14 and 15) on Ubuntu 22.04 LTS cannot find <iostream>...

Feb 25 '23 12:02 adah1972

More generally, today I find that the clang++ compilers (version 14 and 15) on Ubuntu 22.04 LTS cannot find ...

Please consider filing that upstream at https://github.com/llvm/llvm-project/issues

Feb 26 '23 03:02 HighCommander4

I have solved the problem on my computer, after some more investigations.

For some reasons gcc-12 is installed on my system (I do not think I did it), and clang is trying to use it for C++ header files (it searches directories like /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++). The problem is that only gcc-12 is installed, but not g++-12.

After installing g++-12, all problems are gone.

I have realized now it was actually one of the recommended options in this discussion. Sorry for not reading carefully. I think part of the confusion was that this issue is open. Maybe your should mark it closed to indicate there is already a solution.

Feb 27 '23 14:02 adah1972

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Ubuntu 22.04 - C++ header file not found using Vim with YouCompleteMe

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