Linker error when using qMin(), qMax(), qBound()

[zavulon]

Nope, in my second example I keep using the same static const float. It's initialized inside the class and used very well inside the later code, but not in function qMax. I am already beginning to suspect that the error occurs because qMax() takes its arguments by reference (not value). Something wrong, when passing address of a static constant to a function.

Here is the same example 2, but at its full glory. It works, no error here:

class Test
{
public:
static const float KValue=3.0;
Test();
};
 
Test::Test()
{
// Can be any function, not only a constructor
float foo = 1.0;
const float value = KValue; // Make a copy of the static constant
foo = qMax( foo, value );
}
 
int main()
{
// somewhere in a program
Test obj;
}

class Test
{
public:
static const float KValue=3.0;
Test();
};

Test::Test()
{
// Can be any function, not only a constructor
float foo = 1.0;
const float value = KValue; // Make a copy of the static constant
foo = qMax( foo, value );
}

int main()
{
// somewhere in a program
Test obj;
}

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I've also noticed the following facts:
* Changing from float to int doesn't change the situation a bit.
* Using "normal" functions that take arguments by value (not by reference) doesn't lead to the error. Such functions can easily take static constants as arguments.

[caduel]

Probably the compiler optimizes your use of that "static const" away. (As it is static const, it is guaranteed to never change and can be replaced by its compile time value).
(Try without optimizations...)