VSCode cannot see <ranges> namespaces in Clang 15 #9888

Zingam · 2022-09-18T13:52:00Z

Type: Bug

I have been playing around with Clang 15 on Linux. I installed it via:
https://apt.llvm.org/
I created the "update-alternatives" manually, etc.

I copy & pasted this piece of code in a test CMake project:

  std::cout << "Ranges\n";
  auto const ints = { 0, 1, 2, 3, 4, 5 };
  auto even = [](int i) { return 0 == i % 2; };
  auto square = [](int i) { return i * i; };

  // "pipe" syntax of composing the views:
  for (int i :
       ints | std::views::filter(even) | std::views::transform(square)) {
    std::format("where am i? {}", "\n");
    std::cout << i << ' ';
  }

  std::cout << '\n';

  // a traditional "functional" composing syntax:
  for (int i : std::views::transform(std::views::filter(ints, even), square))
  {
    std::cout << i << ' ';
  }
  std::cout << "\n";

With GCC 12 config:

With Clang 15 config:

Extension version: 1.12.4
VS Code version: Code 1.71.2 (74b1f979648cc44d385a2286793c226e611f59e7, 2022-09-14T21:12:14.256Z)
OS version: Linux x64 5.15.0-47-generic snap
Modes:
Sandboxed: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 x 2800)
GPU Status	2d_canvas: unavailable_software canvas_oop_rasterization: disabled_off direct_rendering_display_compositor: disabled_off_ok gpu_compositing: disabled_software multiple_raster_threads: enabled_on opengl: disabled_off rasterization: disabled_software raw_draw: disabled_off_ok skia_renderer: enabled_on video_decode: disabled_software video_encode: disabled_software vulkan: disabled_off webgl: unavailable_software webgl2: unavailable_software webgpu: disabled_off
Load (avg)	1, 1, 1
Memory (System)	7.42GB (3.47GB free)
Process Argv	--no-sandbox --force-user-env --unity-launch --crash-reporter-id 20280fc3-3c6d-43d3-9eb5-55c536b003d8
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu-wayland
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu-wayland
XDG_SESSION_TYPE	wayland

A/B Experiments

vsliv368cf:30146710
vsreu685:30147344
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pythonvspyl392:30443607
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pythonptprofiler:30281270
vsdfh931cf:30280410
vshan820:30294714
vstes263:30335439
vscorecescf:30445987
pythondataviewer:30285071
vscod805cf:30301675
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
cmake_vspar411:30557514
vsaa593:30376534
pythonvs932:30410667
cppdebug:30492333
vscaat:30438848
vsclangdf:30486550
c4g48928:30535728
hb751961:30553087
dsvsc012cf:30540253
azure-dev_surveyone:30548225
2144e591:30553903
vsccc:30566497
fc301958:30567733

The text was updated successfully, but these errors were encountered:

Zingam · 2022-09-18T14:00:51Z

Test.zip

sean-mcmanus · 2022-09-20T18:29:50Z

I'm not reproing the issue. Can you run C/C++: Log Diagnostics and provide the output and/or verify the clang 15 compiler is being used with C++23?

sean-mcmanus · 2022-09-20T18:45:35Z

Also, you could run a command line /usr/bin/clang++-15 -std=c++2b -E ./test.cpp > ./test.out.cpp to generate a preprocessed file and look for an IntelliSense error that may be the root cause of the failure and what header is causing it.

Zingam · 2022-09-22T06:05:17Z

This is 100% reproducible on my machine with the described setup with the attached Test.zip.
Some details:

x64 Ubuntu 22.04
LLVM installed from here: https://apt.llvm.org/
Ubuntu's GCC 12 package

Steps to reproduce:

Test2.zip

Start VSCode
The project is opened by default, VSCode GCC Debug preset is selected by default.
Switch to VSCode Clang Debug, rebuild

Observed the red squiggly lines. The squiggles appeared after the rebuild.

Please note the ranges include location:

I'm not reproing the issue. Can you run C/C++: Log Diagnostics and provide the output and/or verify the clang 15 compiler is being used with C++23?

This is the output:

-------- Diagnostics - 9/22/2022, 9:02:57 AM
Version: 1.12.4
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "${workspaceFolder}/**"
    ],
    "defines": [],
    "compilerPath": "/usr/bin/clang",
    "cStandard": "c17",
    "cppStandard": "c++14",
    "intelliSenseMode": "linux-clang-x64",
    "intelliSenseModeIsExplicit": false,
    "cStandardIsExplicit": false,
    "cppStandardIsExplicit": false,
    "mergeConfigurations": false,
    "compilerPathIsExplicit": false,
    "configurationProvider": "ms-vscode.cmake-tools",
    "browse": {
        "path": [
            "${workspaceFolder}/**"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
Custom browse configuration: 
{
    "browsePath": [
        "/home/hristo/Projects/ClangTest/src"
    ],
    "compilerPath": "/usr/bin/clang++",
    "compilerArgs": [],
    "compilerFragments": [
        "-g",
        "-stdlib=libc++",
        "-fexperimental-library",
        "-W",
        "-Wall",
        "-Werror",
        "-Wpedantic",
        "-std=gnu++2b"
    ]
}
Custom configurations:
[ /home/hristo/Projects/ClangTest/src/main.cpp ]
{
    "includePath": [],
    "defines": [],
    "compilerPath": "/usr/bin/clang++",
    "compilerArgs": [],
    "compilerFragments": [
        "-g",
        "-stdlib=libc++",
        "-fexperimental-library",
        "-W",
        "-Wall",
        "-Werror",
        "-Wpedantic",
        "-std=gnu++2b"
    ]
}
Translation Unit Mappings:
[ /home/hristo/Projects/ClangTest/src/main.cpp ]:
    /home/hristo/Projects/ClangTest/src/main.cpp
Translation Unit Configurations:
[ /home/hristo/Projects/ClangTest/src/main.cpp ]:
    Process ID: 6330
    Memory Usage: 124 MB
    Compiler Path: /usr/bin/clang++
    Includes:
        /usr/lib/llvm-15/include/c++/v1
        /usr/lib/llvm-15/lib/clang/15.0.1/include
        /usr/local/include
        /usr/include/x86_64-linux-gnu
        /usr/include
    Standard Version: c++23
    IntelliSense Mode: linux-clang-x64
    Other Flags:
        --clang
        --clang_version=150001
Total Memory Usage: 124 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 22051

Zingam · 2022-09-22T06:12:54Z

/usr/bin/clang++-15 -std=c++2b -E ./test.cpp > ./test.out.cpp

I run this command: /usr/bin/clang++-15 -std=c++2b -E ./main.cpp > ./main.out.cpp but I don't think that it is correct. Here is the output anyway:

main.zip

Zingam · 2022-09-22T06:15:41Z

Also, you could run a command line /usr/bin/clang++-15 -std=c++2b -E ./test.cpp > ./test.out.cpp to generate a preprocessed file and look for an IntelliSense error that may be the root cause of the failure and what header is causing it.

Should the command be: /usr/bin/clang++-15 -std=c++2b -stdlib=libc++ -fexperimental-library -E ./main.cpp > ./main.out.cpp

main2.zip

Zingam · 2022-09-22T06:22:59Z

$ update-alternatives --config gcc
There is only one alternative in link group gcc (providing /usr/bin/gcc): /usr/bin/gcc-12
Nothing to configure.
$ update-alternatives --config g++
There is only one alternative in link group g++ (providing /usr/bin/g++): /usr/bin/g++-12
Nothing to configure.
$ update-alternatives --config clang
There is only one alternative in link group clang (providing /usr/bin/clang): /usr/bin/clang-15
Nothing to configure.
$ update-alternatives --config clang++
There is only one alternative in link group clang++ (providing /usr/bin/clang++): /usr/bin/clang++-15
Nothing to configure.

Zingam · 2022-09-22T06:25:35Z

Clean reconfigure for *VSCode Clang Debug" CMake preset:

[main] Configuring folder: ClangTest
[driver] Removing /home/hristo/Projects/ClangTest/.build/vscode-clang-debug/CMakeCache.txt
[driver] Removing /home/hristo/Projects/ClangTest/.build/vscode-clang-debug/CMakeFiles
[proc] Executing command: /snap/cmake/current/bin/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=/home/hristo/Projects/ClangTest/.build-out/vscode-clang-debug -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -S/home/hristo/Projects/ClangTest -B/home/hristo/Projects/ClangTest/.build/vscode-clang-debug -G Ninja
[cmake] -- The CXX compiler identification is Clang 15.0.1
[cmake] -- Detecting CXX compiler ABI info
[cmake] -- Detecting CXX compiler ABI info - done
[cmake] -- Check for working CXX compiler: /usr/bin/clang++ - skipped
[cmake] -- Detecting CXX compile features
[cmake] -- Detecting CXX compile features - done
[cmake] -- CPACK_GENERATOR: DEB;RPM
[cmake] -- CPACK_DEBIAN_PACKAGE_NAME ClangTest
[cmake] -- CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA /home/hristo/Projects/ClangTest/assets/linux/package/deb/scripts/preinst
[cmake] -- CPACK_PROJECT_NAME ClangTest
[cmake] -- --- AFTER CPack ---
[cmake] -- CPACK_GENERATOR: TBZ2;TGZ;TXZ;TZ
[cmake] -- CPACK_DEBIAN_PACKAGE_NAME ClangTest
[cmake] -- CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA /home/hristo/Projects/ClangTest/assets/linux/package/deb/scripts/preinst
[cmake] -- CPACK_PROJECT_NAME ClangTest
[cmake] -- Configuring done
[cmake] -- Generating done
[cmake] CMake Warning:
[cmake] Manually-specified variables were not used by the project:
[cmake]
[cmake] CMAKE_C_COMPILER
[cmake]
[cmake]
[cmake] -- Build files have been written to: /home/hristo/Projects/ClangTest/.build/vscode-clang-debug

Clean reconfigure for VSCode GCC Debug CMake preset:

[main] Configuring folder: ClangTest
[driver] Removing /home/hristo/Projects/ClangTest/.build/vscode-gcc-debug/CMakeCache.txt
[driver] Removing /home/hristo/Projects/ClangTest/.build/vscode-gcc-debug/CMakeFiles
[proc] Executing command: /snap/cmake/current/bin/cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=/home/hristo/Projects/ClangTest/.build-out/vscode-gcc-debug -DCMAKE_C_COMPILER=/usr/bin/gcc-12 -DCMAKE_CXX_COMPILER=/usr/bin/g++-12 -S/home/hristo/Projects/ClangTest -B/home/hristo/Projects/ClangTest/.build/vscode-gcc-debug -G Ninja
[cmake] -- The CXX compiler identification is GNU 12.1.0
[cmake] -- Detecting CXX compiler ABI info
[cmake] -- Detecting CXX compiler ABI info - done
[cmake] -- Check for working CXX compiler: /usr/bin/g++-12 - skipped
[cmake] -- Detecting CXX compile features
[cmake] -- Detecting CXX compile features - done
[cmake] -- CPACK_GENERATOR: DEB;RPM
[cmake] -- CPACK_DEBIAN_PACKAGE_NAME ClangTest
[cmake] -- CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA /home/hristo/Projects/ClangTest/assets/linux/package/deb/scripts/preinst
[cmake] -- CPACK_PROJECT_NAME ClangTest
[cmake] -- --- AFTER CPack ---
[cmake] -- CPACK_GENERATOR: TBZ2;TGZ;TXZ;TZ
[cmake] -- CPACK_DEBIAN_PACKAGE_NAME ClangTest
[cmake] -- CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA /home/hristo/Projects/ClangTest/assets/linux/package/deb/scripts/preinst
[cmake] -- CPACK_PROJECT_NAME ClangTest
[cmake] -- Configuring done
[cmake] -- Generating done
[cmake] CMake Warning:
[cmake] Manually-specified variables were not used by the project:
[cmake]
[cmake] CMAKE_C_COMPILER
[cmake]
[cmake]
[cmake] -- Build files have been written to: /home/hristo/Projects/ClangTest/.build/vscode-gcc-debug

sean-mcmanus · 2022-09-23T07:41:05Z

With the main2.zip file I hit https://developercommunity.visualstudio.com/t/C-IntelliSense-doesnt-recognize-clang/10156062 , which might be the root cause of this bug, but I'm not sure yet. I don't get the error when I remove the __attribute__((using_if_exists)).

sean-mcmanus · 2022-09-23T08:23:42Z

Also, with the main.zip, I'm getting some "not implemented" error internally -- our C++23 support is still in development so it looks like the system header code is using features we don't support yet. Are you able to repro the issue with C++20? I can try myself later too...

Zingam · 2022-09-24T07:36:23Z

It's the same in C++20 mode. The squiggles appear/disappear only after a rebuild (after switching a cmake configure preset):

Test3.zip

sean-mcmanus · 2022-09-24T08:02:37Z

Ah, okay -- I got the repro now -- I didn't have libc++ installed. I'm investigating...

UPDATE: Looks like we aren't handling "-fexperimental-library" sufficiently -- clang itself gives the same error without that flag. Still investigating...

sean-mcmanus · 2022-09-26T16:43:25Z

@Zingam You should be able to work around the issue via using "defines": [ "__has_feature(experimental_library)=1"], I'm not sure yet if the fix will make it into 1.13.1 or not.

sean-mcmanus · 2022-09-28T06:16:29Z

Fixed with 1.13.1: https://github.com/microsoft/vscode-cpptools/releases/tag/v1.13.1

Zingam · 2022-09-29T21:24:22Z

I switched to 1.13.1. I can confirm that the reported issue is fix.

Now I'm experiencing two more issues with the same "test".

Performance when CTRL+Click on std::view is very poor on my machine. It takes very long to load the IntelliSense data, and then the line that should appears under std::range::view feels to no appear: appears disappears. This feature behaves erratically. This sluggish behavior is present in the Clang configuration. In the GCC configuration the performance is much smoother. IMO
In the GCC configuration now I am seeing this (I haven't noticed this error before):

sean-mcmanus · 2022-09-30T14:49:35Z

@Zingam Okay, I've filed #9937 to track those issues.

sean-mcmanus self-assigned this Sep 20, 2022

sean-mcmanus added this to the 1.13 milestone Sep 20, 2022

sean-mcmanus added investigate: repro This issue's repro steps needs to be investigated/confirmed Language Service parser bug labels Sep 20, 2022

sean-mcmanus removed this from the 1.13 milestone Sep 20, 2022

sean-mcmanus added more info needed The issue report is not actionable in its current state and removed investigate: repro This issue's repro steps needs to be investigated/confirmed labels Sep 20, 2022

sean-mcmanus added investigate: repro This issue's repro steps needs to be investigated/confirmed and removed more info needed The issue report is not actionable in its current state labels Sep 23, 2022

sean-mcmanus added this to the 1.13 milestone Sep 23, 2022

sean-mcmanus added the quick fix label Sep 26, 2022

sean-mcmanus removed the investigate: repro This issue's repro steps needs to be investigated/confirmed label Sep 26, 2022

sean-mcmanus modified the milestones: 1.13, 1.13.1 Sep 26, 2022

sean-mcmanus added the fixed Check the Milestone for the release in which the fix is or will be available. label Sep 26, 2022

sean-mcmanus mentioned this issue Sep 30, 2022

IntelliSense is slow with ranges in clang mode (and gcc mode is giving an error) #9937

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VSCode cannot see <ranges> namespaces in Clang 15 #9888

VSCode cannot see <ranges> namespaces in Clang 15 #9888

Zingam commented Sep 18, 2022 •

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VSCode cannot see <ranges> namespaces in Clang 15 #9888

VSCode cannot see <ranges> namespaces in Clang 15 #9888

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