Environment
- OS and Version: Arch Linux x64, fully up-to-date
- VS Code Version: 1.99.3
- C/C++ Extension Version: 1.24.5
- If using SSH remote, specify OS of remote machine: N/A
Bug Summary and Steps to Reproduce
Bug Summary:
In C, if a static function takes a struct that was defined within another struct, a false positive declaration-is-incompatible problem appears.
Regression of #8751
Steps to reproduce:
- With the C/C++ extension installed and running, open a C file that contains a tagged structure defined within another tagged structure, and a static function which accepts a parameter of that nested tagged structure type. (example included below):
- Validate that file compiles and executes as expected.
Expected behavior:
No problem is noted
Actual behavior:
A "declaration is incompatible" problem appears.
declaration is incompatible with "int print_foo_bar_static(const struct foo_bar *fbp)" (declared at line 33)
Configuration and Logs
c_cpp_properties.json
{
"configurations": [
{
"name": "Linux",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [],
"compilerPath": "/usr/bin/gcc",
"cStandard": "c17",
"cppStandard": "c++17",
"intelliSenseMode": "linux-gcc-x64"
}
],
"version": 4
}Diagnostics:
-------- Diagnostics - 4/19/2025, 11:10:46 AM
Version: 1.24.5
Current Configuration:
{
"name": "Linux",
"includePath": [
"/home/tony/src/asdf/**"
],
"defines": [],
"compilerPath": "/usr/bin/gcc",
"cStandard": "c17",
"cppStandard": "c++17",
"intelliSenseMode": "linux-gcc-x64",
"compilerPathIsExplicit": true,
"cStandardIsExplicit": true,
"cppStandardIsExplicit": true,
"intelliSenseModeIsExplicit": true,
"compilerPathInCppPropertiesJson": "/usr/bin/gcc",
"mergeConfigurations": false,
"recursiveIncludes": {
"reduce": "default",
"priority": "afterSystemIncludes",
"order": "depthFirst"
},
"browse": {
"limitSymbolsToIncludedHeaders": true
}
}
Modified Settings:
{
"C_Cpp.vcFormat.newLine.beforeOpenBrace.function": "newLine",
"C_Cpp.vcFormat.newLine.beforeOpenBrace.block": "sameLine",
"C_Cpp.clang_format_fallbackStyle": "GNU"
}
Additional Tracked Settings:
{
"editorTabSize": 8,
"editorInsertSpaces": false,
"editorAutoClosingBrackets": "languageDefined",
"filesEncoding": "utf8",
"filesAssociations": {
"*.h": "c"
},
"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): 1.24.5.0
Current database path: /home/tony/.cache/vscode-cpptools/3c2dde7ab04cc03895f85c14d63a05eb/.browse.VC.db
Translation Unit Mappings:
[ /home/tony/src/asdf/main.c - source TU]:
/usr/include/bits/types/FILE.h
/usr/include/bits/typesizes.h
/usr/include/stdio.h
/usr/include/stdlib.h
/usr/include/sys/cdefs.h
/usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include/stddef.h
Translation Unit Configurations:
[ /home/tony/src/asdf/main.c ]
Process ID: 29641
Memory Usage: 23 MB
Compiler Path: /usr/bin/gcc
Include paths:
system include: /usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include
system include: /usr/local/include
system include: /usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include-fixed
system include: /usr/include
Standard Version: c17
IntelliSense Mode: linux-gcc-x64
Other Flags:
--gcc
--gnu_version=140201
Total Memory Usage: 23 MB
------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 34569
C/C++ Extension Debug logs: attached, see "Additional context"
Other Extensions
No response
Additional context
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
struct foo {
struct foo_bar {
int x, y;
} bar;
};
int print_foo_bar(const struct foo_bar *fbp);
static int print_foo_bar_static(const struct foo_bar *fbp); /* problem appears here */
int main(void)
{
struct foo foo = { {1, 1} };
if (print_foo_bar(&foo.bar) < 0) {
exit(EXIT_FAILURE);
}
if (print_foo_bar_static(&foo.bar) < 0) {
exit(EXIT_FAILURE);
}
}
int print_foo_bar(const struct foo_bar *fbp)
{
assert(fbp != NULL);
return printf("%p->%d.%d\n", fbp, fbp->x, fbp->y);
}
static int print_foo_bar_static(const struct foo_bar *fbp)
{
assert(fbp != NULL);
return printf("%p->%d.%d\n", fbp, fbp->x, fbp->y);
}[tony@framework asdf]$ cc -std=c99 -o asdf main.c && ./asdf; echo $?
0x7fff78f88d70->1.1
0x7fff78f88d70->1.1
0
extension_logs.txt
Environment
Bug Summary and Steps to Reproduce
Bug Summary:
In C, if a static function takes a struct that was defined within another struct, a false positive declaration-is-incompatible problem appears.
Regression of #8751
Steps to reproduce:
Expected behavior:
No problem is noted
Actual behavior:
A "declaration is incompatible" problem appears.
Configuration and Logs
c_cpp_properties.json{ "configurations": [ { "name": "Linux", "includePath": [ "${workspaceFolder}/**" ], "defines": [], "compilerPath": "/usr/bin/gcc", "cStandard": "c17", "cppStandard": "c++17", "intelliSenseMode": "linux-gcc-x64" } ], "version": 4 }Diagnostics:
C/C++ Extension Debug logs: attached, see "Additional context"
Other Extensions
No response
Additional context
extension_logs.txt