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fno-char8_t argument is ignored from compile commands #12968
Description
Environment
- OS and Version: W11 22631.4460
- VS Code Version: 1.95.1
- C/C++ Extension Version: 1.23.1
Bug Summary and Steps to Reproduce
Bug Summary:
An option exists on clang (there is an equivalent on msvc with /Zc:char8_t-) removing the char8_t type from the language in C++20. It is controlled in clang by the -fno-char8_t argument.
When using compile commands, with this argument and --std=c++20 present in the command, the parsing seems to ignore the -fno-char8_t, leading to Intellisense errors.
When looking for duplicates, I found #12106, but given the explanation, it seems that every argument is parsed, even if not needed so it doesn't related to this issue.
Steps to reproduce:
- create a file containing the code below:
#include <stdio.h>
int main(int argc, char** argv)
{
printf(u8"Hello UTF-8");
return 0;
}- create a compile commands containing the source with both
-fno-char8_tand--std=c++20in the command, as below:
[
{
"directory": "src",
"command": "clang++ -g -Wall -fno-char8_t --std=c++20",
"file": "test.cc"
}
]- Notice the errors displaying on
u8, indicating that argumentconst char8_t*is incompatible withconst char*
Expected behavior:
The parsing should take account of the -fno-char8_t to give it correctly to the parser. On a side note, the argument is not given either to clang-tidy, leading to other errors related to it.
Configuration and Logs
-------- Diagnostics - 11/15/2024, 11:10:57 PM
Version: 1.23.1
Current Configuration:
{
"name": "Win32",
"includePath": [
"c:/Dev/Sources/C++ tests/**"
],
"defines": [
"_DEBUG",
"UNICODE",
"_UNICODE"
],
"cStandard": "c17",
"intelliSenseMode": "windows-clang-x64",
"compileCommands": "c:\\Dev\\Sources\\C++ tests/compile_commands.json",
"compilerPathIsExplicit": false,
"cStandardIsExplicit": true,
"cppStandardIsExplicit": true,
"intelliSenseModeIsExplicit": true,
"compileCommandsInCppPropertiesJson": "${workspaceFolder}/compile_commands.json",
"cppStandard": "c++17",
"mergeConfigurations": false,
"browse": {
"path": [
"c:/Dev/Sources/C++ tests/**",
"${workspaceFolder}"
],
"limitSymbolsToIncludedHeaders": true
}
}
Modified Settings:
{
"C_Cpp.default.compilerPath": "C:\\Dev\\LLVM\\bin\\clang.exe",
"C_Cpp.default.cppStandard": "c++17",
"C_Cpp.exclusionPolicy": "checkFilesAndFolders",
"C_Cpp.formatting": "clangFormat",
"C_Cpp.doxygen.generateOnType": false,
"C_Cpp.codeAnalysis.exclude": {
"folder": true
},
"C_Cpp.codeAnalysis.clangTidy.enabled": true,
"C_Cpp.codeAnalysis.clangTidy.path": "C:\\Dev\\LLVM\\bin\\clang-tidy.exe",
"C_Cpp.intelliSenseMemoryLimit": 16384,
"C_Cpp.loggingLevel": "Debug",
"C_Cpp.experimentalFeatures": "enabled"
}
Additional Tracked Settings:
{
"editorTabSize": 4,
"editorInsertSpaces": false,
"editorAutoClosingBrackets": "languageDefined",
"filesEncoding": "utf8",
"filesAssociations": {
"*.sln": "xml",
"log": "log"
},
"filesExclude": {
"**/.git": true,
"**/.svn": true,
"**/.hg": true,
"**/CVS": true,
"**/.DS_Store": true,
"**/Thumbs.db": true
},
"filesAutoSaveAfterDelay": false,
"editorInlayHintsEnabled": true,
"editorParameterHintsEnabled": true,
"searchExclude": {
"**/node_modules": true,
"**/bower_components": true,
"**/*.code-search": true
},
"workbenchSettingsEditor": "ui"
}
cpptools version (native): 1.23.1.0
Current database path: C:\USERS\AUBIN\APPDATA\LOCAL\MICROSOFT\VSCODE-CPPTOOLS\2E0838E3C682A3A1661B48151AF947FF\.BROWSE.VC.DB
Translation Unit Mappings:
[ C:\Dev\Sources\C++ tests\src\test.cc - source TU]:
Translation Unit Configurations:
[ C:\Dev\Sources\C++ tests\src\test.cc ]
Process ID: 17732
Memory Usage: 64 MB
Compiler Path: C:\Dev\LLVM\bin\clang++.exe
Includes:
System Includes:
C:\Dev\LLVM\lib\clang\18\include
C:\Dev\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include
C:\Dev\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\atlmfc\include
C:\Windows Kits\10\Include\10.0.22621.0\ucrt
C:\Windows Kits\10\Include\10.0.22621.0\shared
C:\Windows Kits\10\Include\10.0.22621.0\um
C:\Windows Kits\10\Include\10.0.22621.0\winrt
C:\Windows Kits\10\Include\10.0.22621.0\cppwinrt
Standard Version: c++20
IntelliSense Mode: windows-clang-x64
Other Flags:
--clang
--clang_version=180108
--ms_compatibility
compile_commands.json entry:
directory: c:\Dev\Sources\C++ tests/src
file: c:\Dev\Sources\C++ tests/src/test.cc
command: clang++ -g -Wall -fno-char8_t --std=c++20
Total Memory Usage: 64 MB
Browse Paths from compile_commands.json, from workspace folder: C:\Dev\Sources\C++ tests
C:\Dev\Sources\C++ tests\src
------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 5383Other Extensions
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sean-mcmanus commentedon Dec 6, 2024
Isaac Newton Akah (@bluTree) Fixed with https://github.com/microsoft/vscode-cpptools/releases/tag/v1.23.2