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Regression: -iquote not understood depending on order w.r.t. -isystem #13638
Description
Environment
- OS and Version: Ubuntu 22.04.4 LTS
- VS Code Version: 1.100.2
- C/C++ Extension Version: 1.25.3
Bug Summary and Steps to Reproduce
Bug Summary
The -iquote option is not understood by the language service if that comes after an -isystem option, resulting in "#include errors detected" errors.
Additional info
- Downgrade to an older version (tried with 1.23.5) seems to fix the issue.
- Ordering the compiler include path options so that
-iquotecomes before-isystemresults in expected behavior.
Steps to reproduce
In a workspace hierarchy as:
$ find . -type f
./.vscode/c_cpp_properties.json
./cpptools_bug_mwe.cpp
./foo/foo.hpp
./compile_commands.json
./bar/bar.hppwith cpptools_bug_mwe.cpp as:
#include "foo.hpp" // in foo/foo.hpp
#include <bar.hpp> // in bar/bar.hpp
int main()
{
return 0;
}with .vscode/c_cpp_properties.json as:
{
"configurations": [
{
"name": "Linux",
"compileCommands": ["${workspaceFolder}/compile_commands.json"]
}
],
"version": 4
}and compile_commands.json as:
[
{
"directory": "<path to ws root>",
"command": "cc -isystem bar -iquote foo cpptools_bug_mwe.cpp -o cpptools_bug_mwe.out",
"file": "cpptools_bug_mwe.cpp",
"output": "cpptools_bug_mwe.out"
}
]
you get:
and the following output from "C/C++ Log Diagnostics": cpp_diagnostics_fail.txt
Expected behavior
When ordering the compiler include options with -iquote before -isystem, i.e., with compile_commands.json as:
[
{
"directory": "<path to ws root>",
"command": "cc -iquote foo -isystem bar cpptools_bug_mwe.cpp -o cpptools_bug_mwe.out",
"file": "cpptools_bug_mwe.cpp",
"output": "cpptools_bug_mwe.out"
}
]the expected behavior i.e. no include errors is obtained, with the following output from "C/C++ Log Diagnostics": cpp_diagnostics_ok.txt
Configuration and Logs
---------------------- c_cpp_properties.json ----------------------
{
"configurations": [
{
"name": "Linux",
"compileCommands": ["${workspaceFolder}/compile_commands.json"]
}
],
"version": 4
}
---------------------- compile_commands.json ----------------------
[
{
"directory": "/home/dev/misc/cpptools_bug_mwe",
"command": "cc -isystem bar -iquote foo cpptools_bug_mwe.cpp -o cpptools_bug_mwe.out",
"file": "cpptools_bug_mwe.cpp",
"output": "cpptools_bug_mwe.out"
}
]
---------------------- C/C++: Log Diagnostics ----------------------
-------- Diagnostics - 5/26/2025, 7:49:44 PM
Version: 1.25.3
Current Configuration:
{
"name": "Linux",
"compileCommands": [
"/home/dev/misc/cpptools_bug_mwe/compile_commands.json"
],
"compilerPathIsExplicit": false,
"cStandardIsExplicit": false,
"cppStandardIsExplicit": false,
"intelliSenseModeIsExplicit": false,
"recursiveIncludesReduceIsExplicit": false,
"recursiveIncludesPriorityIsExplicit": false,
"recursiveIncludesOrderIsExplicit": false,
"compileCommandsInCppPropertiesJson": [
"${workspaceFolder}/compile_commands.json"
],
"mergeConfigurations": false,
"recursiveIncludes": {},
"browse": {
"limitSymbolsToIncludedHeaders": true
}
}
Additional Tracked Settings:
{
"editorTabSize": 4,
"editorInsertSpaces": true,
"editorAutoClosingBrackets": "languageDefined",
"filesEncoding": "utf8",
"filesAssociations": {},
"filesExclude": {
"**/.git": true,
"**/.svn": true,
"**/.hg": 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): 1.25.3.0
Current database path: /home/dev/.cache/vscode-cpptools/6f7add48ab2294ba00d1a991fbc0d457/.browse.VC.db
Translation Unit Mappings:
[ /home/dev/misc/cpptools_bug_mwe/cpptools_bug_mwe.cpp - source TU]:
Translation Unit Configurations:
[ /home/dev/misc/cpptools_bug_mwe/cpptools_bug_mwe.cpp ]
Process ID: 451790
Memory Usage: 18 MB
Compiler Path: /usr/bin/cc
Include paths:
system include (isystem): /home/dev/misc/cpptools_bug_mwe/bar
system include: /usr/include/c++/11
system include: /usr/include/x86_64-linux-gnu/c++/11
system include: /usr/include/c++/11/backward
system include: /usr/lib/gcc/x86_64-linux-gnu/11/include
system include: /usr/local/include
system include: /usr/include/x86_64-linux-gnu
system include: /usr/include
Standard Version: c++17
IntelliSense Mode: linux-gcc-x64
Other Flags:
--g++
--gnu_version=110400
compile_commands.json entry:
directory: /home/dev/misc/cpptools_bug_mwe
file: /home/dev/misc/cpptools_bug_mwe/cpptools_bug_mwe.cpp
command: cc -isystem bar -iquote foo cpptools_bug_mwe.cpp -o cpptools_bug_mwe.out
output: cpptools_bug_mwe.out
Total Memory Usage: 18 MB
Browse Paths from compile_commands.json, from workspace folder: /home/dev/misc/cpptools_bug_mwe
/home/dev/misc/cpptools_bug_mwe
/home/dev/misc/cpptools_bug_mwe/bar
/home/dev/misc/cpptools_bug_mwe/foo
/usr/include
/usr/include/c++/11
/usr/include/c++/11/backward
/usr/include/x86_64-linux-gnu
/usr/include/x86_64-linux-gnu/c++/11
/usr/lib/gcc/x86_64-linux-gnu/11/include
/usr/local/include
------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 4844Other Extensions
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sean-mcmanus commentedon Jun 19, 2025
mdriu Fixed with https://github.com/microsoft/vscode-cpptools/releases/tag/v1.26.2