"-std:c++20" isn't handled with cl.exe #9458
Description
Bug type: Language Service
Describe the bug
- OS and Version: Windows 11 22000.675
- VS Code Version: 1.68.1
- C/C++ Extension Version: 1.10.7
- Other extensions you installed (and if the issue persists after disabling them): CMake (0.0.17), CMake Language Support (0.0.4), CMakeTools (1.11.26), and .NET Install Tool for Extension Authors (1.5.0) [Note: All the other extensions are disabled]
- A clear and concise description of what the bug is, including information about the workspace (i.e. is the workspace a single project or multiple projects, size of the project, etc).
Intellisense does not detect that you are using C++20 and the flag _HAS_CXX20 is set to false. However, the build of the C++ project works fine, only the syntax is detected as wrong. For completeness, this bug does not happen in the C/C++ extension version 1.9.8.
Steps to reproduce
- Create C++ CMake project with
set(CMAKE_CXX_STANDARD 20) - Try to use a C++20 feature such as span
- Gives the error
identifier "span" is undefined C/C++(20)
Expected behavior
Intellisense should detect the project is using C++20 and there should be no error squibbles when using span. The correct behavior happens when using C/C++ extension version 1.9.8
Code sample and logs
- Code sample
CMakeLists.txt
cmake_minimum_required(VERSION 3.15)
project(cmake_example VERSION 1.0)
set(CMAKE_CXX_STANDARD 20)
set(TARGET "cmake")
add_executable(${TARGET} "${CMAKE_SOURCE_DIR}/src/main.cpp")src/main.cpp
#include <span>
using namespace std;
int main(int argc, char const *argv[])
{
span<int> data;
/* code */
return 0;
}
- Configurations in
c_cpp_properties.json
{
"configurations": [
{
"name": "Win32",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [
"_DEBUG",
"UNICODE",
"_UNICODE"
],
"windowsSdkVersion": "10.0.20348.0",
"compilerPath": "C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.30.30705/bin/Hostx64/x64/cl.exe",
"cStandard": "c17",
"cppStandard": "c++20",
"intelliSenseMode": "windows-msvc-x64",
"configurationProvider": "ms-vscode.cmake-tools"
}
],
"version": 4
}- Logs from running
C/C++: Log Diagnosticsfrom the VS Code command palette
-------- Diagnostics - 16/6/2022, 15:19:51
Version: 1.10.7
Current Configuration:
{
"name": "Win32",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [
"_DEBUG",
"UNICODE",
"_UNICODE"
],
"windowsSdkVersion": "10.0.20348.0",
"compilerPath": "C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.30.30705/bin/Hostx64/x64/cl.exe",
"cStandard": "c17",
"cppStandard": "c++20",
"intelliSenseMode": "windows-msvc-x64",
"configurationProvider": "ms-vscode.cmake-tools",
"compilerPathIsExplicit": true,
"cStandardIsExplicit": true,
"cppStandardIsExplicit": true,
"intelliSenseModeIsExplicit": true,
"mergeConfigurations": false,
"browse": {
"path": [
"${workspaceFolder}/**"
],
"limitSymbolsToIncludedHeaders": true
}
}
Custom browse configuration:
{
"browsePath": [
"c:/users/tangtang/documents/cppprojects/cmake_example/build/cmakefiles/640c20b75fe1fe6a2c596525d1cede83",
"c:/users/tangtang/documents/cppprojects/cmake_example/src"
],
"compilerPath": "c:/program files/microsoft visual studio/2022/community/vc/tools/msvc/14.32.31326/bin/hostx86/x64/cl.exe",
"compilerArgs": [],
"compilerFragments": [
"/DWIN32 /D_WINDOWS /GR /EHsc /Zi /Ob0 /Od /RTC1 -MDd",
"-std:c++20"
]
}
Custom configurations:
[ C:\Users\Tangtang\Documents\CppProjects\cmake_example\src\main.cpp ]
{
"includePath": [],
"defines": [],
"compilerPath": "c:/program files/microsoft visual studio/2022/community/vc/tools/msvc/14.32.31326/bin/hostx86/x64/cl.exe",
"compilerArgs": [],
"compilerFragments": [
"/DWIN32 /D_WINDOWS /GR /EHsc /Zi /Ob0 /Od /RTC1 -MDd",
"-std:c++20"
]
}
Translation Unit Mappings:
[ C:\Users\Tangtang\Documents\CppProjects\cmake_example\src\main.cpp ]:
C:\Users\Tangtang\Documents\CppProjects\cmake_example\src\main.cpp
C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\span *
Translation Unit Configurations:
[ C:\Users\Tangtang\Documents\CppProjects\cmake_example\src\main.cpp ]:
Process ID: 15888
Memory Usage: 13 MB
Compiler Path: c:/program files/microsoft visual studio/2022/community/vc/tools/msvc/14.32.31326/bin/hostx86/x64/cl.exe
Includes:
C:\PROGRAM FILES\MICROSOFT VISUAL STUDIO\2022\COMMUNITY\VC\TOOLS\MSVC\14.32.31326\INCLUDE
C:\PROGRAM FILES\MICROSOFT VISUAL STUDIO\2022\COMMUNITY\VC\TOOLS\MSVC\14.32.31326\ATLMFC\INCLUDE
C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.20348.0\UM
C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.20348.0\UCRT
C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.20348.0\SHARED
C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.20348.0\WINRT
C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.20348.0\CPPWINRT
Defines:
WIN32
_WINDOWS
Standard Version: ms_c++14
IntelliSense Mode: windows-msvc-x64
Other Flags:
--rtti
Total Memory Usage: 13 MB
------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 4937