False positive error C/C++(304) on std::ranges::sort with GCC 16.1 (C++26)

[XLT557]

Environment

• OS and Version: Windows 11
• VS Code Version: 1.130.0
• C/C++ Extension Version: 1.32.2
• If using SSH remote, specify OS of remote machine: N

Bug Summary and Steps to Reproduce

Bug description:
IntelliSense reports a false positive error when using std::ranges::sort with GCC 16.1 in C++26 mode. The exact error message is:

No instance of overloaded function "std::ranges::__sort_fn::operator()" matches the argument list C/C++(304)

The code compiles perfectly fine with GCC 16.1. Interestingly, if I downgrade the compiler to GCC 15.2, IntelliSense works as expected without any squiggles. This seems to be an EDG parser issue with the latest GCC 16.1 standard library implementation for C++26.

Steps to reproduce:

1. Configure compilerPath to a GCC 16.1 (MinGW-w64) g++.exe.
2. Set cppStandard to c++26.
3. Paste the following minimal reproducible example:

#include <iostream>
#include <vector>
#include <algorithm>

namespace ranges = std::ranges;

int main() {
    std::vector a = {2, 8, 9, 0, 1, 3, 6, 4};
    ranges::sort(a); // IntelliSense red squiggle here
}

4. See error

Expected behavior:
No IntelliSense errors should be reported, as the code is valid and compiles successfully.

Configuration and Logs

### Configuration (`settings.json`)


{
    "C_Cpp.clang_format_fallbackStyle": "Google",
    "C_Cpp.default.compilerArgs": [
        "-std=c++26",
        "-DDEBUG",
        "-fmodules-ts",
        "-lstdc++exp"
    ],
    "C_Cpp.default.compilerPath": "D:\\mingw64\\bin\\g++.exe",
    "C_Cpp.default.cppStandard": "c++26",
    "C_Cpp.default.cStandard": "c23"
}



### C/C++ Log Diagnostics


-------- Diagnostics - 2026/7/24 17:12:22
Version: 1.32.2
Current Configuration:
{
    "name": "Win32",
    "includePath": [
        "d:/XCPC/**"
    ],
    "defines": [
        "_DEBUG",
        "UNICODE",
        "_UNICODE"
    ],
    "intelliSenseMode": "windows-gcc-x64",
    "compilerArgs": [
        "-std=c++26",
        "-DDEBUG",
        "-fmodules-ts",
        "-lstdc++exp"
    ],
    "cStandard": "c23",
    "cppStandard": "c++26",
    "intelliSenseModeIsExplicit": false,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "mergeConfigurations": false,
    "recursiveIncludes": {},
    "recursiveIncludesReduceIsExplicit": false,
    "recursiveIncludesPriorityIsExplicit": false,
    "recursiveIncludesOrderIsExplicit": false,
    "compilerPath": "D:\\mingw64\\bin\\g++.exe",
    "compilerPathIsExplicit": true,
    "browse": {
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.default.compilerPath": "D:\\mingw64\\bin\\g++.exe",
    "C_Cpp.default.compilerArgs": [
        "-std=c++26",
        "-DDEBUG",
        "-fmodules-ts",
        "-lstdc++exp"
    ],
    "C_Cpp.default.cStandard": "c23",
    "C_Cpp.default.cppStandard": "c++26",
    "C_Cpp.clang_format_fallbackStyle": "Google"
}
Additional Tracked Settings:
{
    "editorTabSize": 2,
    "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): 1.32.2.0
Current database path: C:\Users\xlt19\AppData\Local\Microsoft\vscode-cpptools\de25eeb027bd2ff15613efebd025790c\.BROWSE.VC.DB
Translation Unit Mappings:
[ D:\XCPC\test.cpp - source TU]:
Translation Unit Configurations:
[ D:\XCPC\test.cpp ]
    Process ID: 6360
    Memory Usage: 512 MB
    Compiler Path: D:\mingw64\bin\g++.exe
    Include Paths:
        system include: D:\mingw64\lib\gcc\x86_64-w64-mingw32\16.1.0\include\c++
        system include: D:\mingw64\lib\gcc\x86_64-w64-mingw32\16.1.0\include\c++\x86_64-w64-mingw32
        system include: D:\mingw64\lib\gcc\x86_64-w64-mingw32\16.1.0\include\c++\backward
        system include: D:\mingw64\lib\gcc\x86_64-w64-mingw32\16.1.0\include
        system include: D:\mingw64\lib\gcc\x86_64-w64-mingw32\16.1.0\include-fixed
        system include: D:\mingw64\x86_64-w64-mingw32\include
    Defines:
        _DEBUG
        UNICODE
        _UNICODE
        DEBUG
    Standard Version: c++26
    IntelliSense Mode: windows-gcc-x64
    Other Flags:
        --g++
        --gnu_version=160100
Total Memory Usage: 512 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 2846
Number of files parsed: 1152

Other Extensions

No response

Additional context

Compiler Info:

Using built-in specs.
COLLECT_GCC=D:\mingw64\bin\g++.exe
COLLECT_LTO_WRAPPER=D:/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/16.1.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../../../src/gcc-16.1.0/configure --host=x86_64-w64-mingw32 --build=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --prefix=/mingw64 --with-sysroot=/c/buildroot/x86_64-1610-win32-seh-ucrt-rt_v14-rev1/mingw64 --enable-host-shared --disable-multilib --enable-languages=c,c++,fortran,lto --enable-libstdcxx-time=yes --enable-threads=win32 --enable-libstdcxx-threads=yes --enable-tls --enable-libgomp --enable-libatomic --enable-lto --enable-graphite --enable-checking=release --enable-mingw-wildcard --enable-fully-dynamic-string --enable-version-specific-runtime-libs --enable-libstdcxx-filesystem-ts=yes --disable-libssp --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-gnu-as --with-gnu-ld --with-arch=nocona --with-tune=core2 --with-libiconv --with-system-zlib --with-gmp=/c/buildroot/prerequisites/x86_64-w64-mingw32-static --with-mpfr=/c/buildroot/prerequisites/x86_64-w64-mingw32-static --with-mpc=/c/buildroot/prerequisites/x86_64-w64-mingw32-static --with-isl=/c/buildroot/prerequisites/x86_64-w64-mingw32-static --with-pkgversion='x86_64-win32-seh-rev1, Built by MinGW-Builds project' --with-bugurl=[https://github.com/niXman/mingw-builds](https://github.com/niXman/mingw-builds) LD_FOR_TARGET=/c/buildroot/x86_64-1610-win32-seh-ucrt-rt_v14-rev1/mingw64/bin/ld.exe --with-boot-ldflags='-pipe -fno-ident -L/c/buildroot/x86_64-1610-win32-seh-ucrt-rt_v14-rev1/mingw64/opt/lib -L/c/buildroot/prerequisites/x86_64-zlib-static/lib -L/c/buildroot/prerequisites/x86_64-w64-mingw32-static/lib  -Wl,--disable-dynamicbase -static-libstdc++ -static-libgcc'
Thread model: win32
Supported LTO compression algorithms: zlib
gcc version 16.1.0 (x86_64-win32-seh-rev1, Built by MinGW-Builds project)

[sean-mcmanus]

@XLT557 This has been fixed already with our pending 1.33.5 pre-release -- we're still working on fixing some other issues though so it won't be available till next week or so. It's related to other previously reported gcc 16 issues tracked in #14464 .