mismatchingContainerExpression false positive

Pontus Eriksson — Thu, 09 Jul 2026 17:09:17 -0000

Hello
Using Cppcheck-2.21.0 I get a warning here:

#include <algorithm>
#include <cassert>
#include <vector>

int main()
{
    std::vector<int> v { 1, 1, 2, 3, 3 };
    std::ranges::sort(v);
    v.erase(std::ranges::unique(v).begin(), v.end());
    assert((v == std::vector<int> { 1, 2, 3 }));
}

warning: Iterators to containers from different expressions 'std::ranges::unique(v)' and 'v' are used together. [mismatchingContainerExpression]
v.erase(std::ranges::unique(v).begin(), v.end());
^

returnDanglingLifetime and danglingLifetime false positives

CHR — Wed, 08 Jul 2026 08:28:44 -0000

OK, thanks.

returnDanglingLifetime and danglingLifetime false positives

Nikita Leontiev — Wed, 08 Jul 2026 08:03:30 -0000

No issues here. Just mentioned that initial false positives are not generated with this code structure.

returnDanglingLifetime and danglingLifetime false positives

CHR — Wed, 08 Jul 2026 07:08:49 -0000

Where is the issue here?

invalidPrintfArgType_float and wrongPrintfScanfArgNum false positives

CHR — Wed, 08 Jul 2026 07:07:12 -0000

Thanks for reporting, ticket is here: https://trac.cppcheck.net/ticket/14899

returnDanglingLifetime and danglingLifetime false positives

Nikita Leontiev — Wed, 08 Jul 2026 06:52:00 -0000

returnDanglingLifetime and danglingLifetime are not generated for the following code structure:
test.h:

#include <string>

std::string to_string(const char* str);

test.cpp:

#include "test.h"

std::string to_string(const char* str)
{
    return str;
}

main.cpp:

#include "test.h"

std::string get()
{
    std::string local;
    return to_string(local.c_str());
}

void get(std::string& str)
{
    std::string local;
    str = to_string(local.c_str());
}

invalidPrintfArgType_float and wrongPrintfScanfArgNum false positives

Nikita Leontiev — Wed, 08 Jul 2026 06:26:20 -0000

cppcheck 2.21.0 generates invalidPrintfArgType_float and wrongPrintfScanfArgNum for the following code:

#include <stdio.h>
#include <locale.h>

int main()
{
    double value = 3.14;
    const size_t buffer_size = 64;
    char buffer[buffer_size];
    int precision = 2;
    _locale_t locale = _create_locale(LC_ALL, "C");
    _sprintf_s_l(buffer, buffer_size, "%.*f", locale, precision, value);
    _free_locale(locale);
    return 0;
}

cppcheck.exe --library=windows --enable=all .

test\main.cpp:11:2: warning: %f in format string (no. 2) requires 'double' but the argument type is 'signed int'. [invalidPrintfArgType_float]
 _sprintf_s_l(buffer, buffer_size, "%.*f", locale, precision, value);
 ^
test\main.cpp:11:2: warning: _sprintf_s_l format string requires 2 parameters but 3 are given. [wrongPrintfScanfArgNum]
 _sprintf_s_l(buffer, buffer_size, "%.*f", locale, precision, value);
 ^

Same for _swprintf_s_l.

cppc V2.21.0 - warning suppress not working

CHR — Tue, 07 Jul 2026 06:30:20 -0000

Probably the path to tchar.h is not known to cppcheck. Rather than including that system header in the analysis, you should pass --library=windows --platform=win64, assuming you don't already.

cppc V2.21.0 - warning suppress not working

Derell Licht — Mon, 06 Jul 2026 21:31:05 -0000

I am getting the following error message:

der_libs\common_win.cpp:274:4: error: There is an unknown macro here somewhere. Configuration is required. If _T is a macro then please configure it. [unknownMacro]
   _T("Text Files (*.TXT)\0*.txt\0") /* cppcheck-suppress [unknownMacro] */ \
   ^

I am including tchar.h in my file, so cppcheck shouldn't be confused about this, but in any case, I'm trying to exclude this error via:

static TCHAR const szPalFilter[] = 
    // cppcheck-suppress [unknownMacro]
   _T("Text Files (*.TXT)\0*.txt\0") /* cppcheck-suppress [unknownMacro] */ \
   _T("All Files (*.*)\0*.*\0\0") ;

However, neither of these suppress statements remove the message. Is that because it is an error rather than a warning??

BTW, the file compiles with no warnings, using -Wall ...

how to handle the macros automatically defined by gcc

CHR — Mon, 06 Jul 2026 06:31:14 -0000

This ticket is related: https://trac.cppcheck.net/ticket/8956

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mismatchingContainerExpression false positive

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