is it because the syntax is different?

I've never seen in used in a C++ for-loop before. Did it really work in Windows? What compiler did you use?

Replace in with ,

foreach (auto item, m_vIncuMgr)
{
    ...
}

Even better, use the C++11 range-based for-loop: https://en.cppreference.com/w/cpp/language/range-for

Also, in the future, please post text, not a screenshot.

The for each (... in ...) is an MSVC-only C++ construct, per https://docs.microsoft.com/en-us/cpp/dotnet/for-each-in?view=msvc-160, and it warns:

This non-standard keyword is available in both C++/CLI and native C++ projects. However, its use isn't recommended. Consider using a standard Range-based for Statement (C++) instead.

:D

There was nothing wrong with the build and it worked well.

I also never saw such a for loop in C++ (looks rather like a Python for loop)! Maybe this is something Microsoft invented in their C++ compiler. Anyway you should use what C++ standard specifies.

for each (auto item in m_vIncuMgr)
{
	item->setCurremtStep(Index++);
}

There was nothing wrong with the build and it worked well.
Anyway, thanks for checking the issue.

is it because the syntax is different?

I've never seen in used in a C++ for-loop before. Did it really work in Windows? What compiler did you use?

Replace in with ,

foreach (auto item, m_vIncuMgr)
{
    ...
}

Even better, use the C++11 range-based for-loop: https://en.cppreference.com/w/cpp/language/range-for

Also, in the future, please post text, not a screenshot.