Help with initializing vectors

I understand that in earlier versions of C++ that you cannot initialize vectors in this fashion: std::vector<int> vec = { 1, 2, 3 };

It is also to my understanding that C++ 14 can handle this type of inititliazation.

I think where my problems lies is that I'm not requesting to use C++14 in the proper way inside of my CMAKE file. This is how I'm currently telling my CMAKE file to use C++14: set(cmake_CXX_FLAGS -std=c++14) I was wondering if this is the correct way to do it because I'm still getting an error when I try to initialize my vector with values.

Thanks for any help!

There is no = in the syntax. See

What is the exact error message?
This is the error that I get when I use the = :

error: non-aggregate type
'std::vector<int>' cannot be initialized with an initializer list
std::vector<int> vec = { 1, 2, 3 };

This is the error that I get when I don't use the = :

error: expected ';' at end of
std::vector<int> vec { 1, 2, 3 };

Thanks again for your help!
The gives same error both with and without = in C++98 mode:
 In function 'int main()':
3:41: error: in C++98 'bar' must be initialized by constructor, not by '{...}'
3:41: error: could not convert '{10, 20, 30, 40, 50}' from '<brace-enclosed initializer list>' to 'std::vector<int>'

Thus, the cmake project config file. The following has some examples:

What is the version of your compiler?
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