Неопределенная ссылка на Task::arrSize? [дубликат] ⇐ C++

[Anonymous]

arrSize определен в Tasks.cpp во 2-й строке, 1-я — это include, пространство имен, тип, все правильно:
Заголовок:
class Task
{
private:
uint64_t sp;
uint64_t pc;
int32_t args[31];
int32_t regs[31];
static void growTaskArr();
static void initTasks();
static unsigned int arrSize;

public:
Task(function_t func = (function_t)blankFunc, int32_t _args[] = nullArgs);
void exec();
static void interrupt(Task& taskToPrioritize, int priorityLevel = 2);
static unsigned int getArrSize();
static void shrinkTaskArr();
static void hardwareInterrupt(Task& task);
bool operator!= (const Task& other) const;
};

фрагмент cpp:
__attribute__((used)) unsigned int Task::arrSize = 32;

...но компоновщик все равно сообщает мне, что arrSize не определен:
arm-none-eabi-ld: CENSORED/tasks.o: in function `Task::getArrSize()':
tasks.cpp:(.text+0x1b0): undefined reference to `Task::arrSize'
arm-none-eabi-ld: tasks.cpp:(.text+0x1b4): undefined reference to `Task::arrSize'
arm-none-eabi-ld: CENSORED/tasks.o: in function `Task::growTaskArr()':
tasks.cpp:(.text+0x1c0): undefined reference to `Task::arrSize'
arm-none-eabi-ld: tasks.cpp:(.text+0x1c4): undefined reference to `Task::arrSize'
arm-none-eabi-ld: CENSORED/tasks.o: in function `Task::Task(void (*)(int), int*)':
tasks.cpp:(.text+0x2a0): undefined reference to `Task::arrSize'
arm-none-eabi-ld: CENSORED/tasks.o:tasks.cpp:(.text+0x2a4): more undefined references to `Task::arrSize' follow
arm-none-eabi-ld: CENSORED/tasks.o: in function `Task::Task(void (*)(int), int*)':
tasks.cpp:(.text+0x310): undefined reference to `void derivatedArray(Task*, Task*)'
arm-none-eabi-ld: CENSORED/tasks.o: in function `Task::initTasks()':
tasks.cpp:(.text+0x3f4): undefined reference to `Task::arrSize'
arm-none-eabi-ld: tasks.cpp:(.text+0x3f8): undefined reference to `Task::arrSize'
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Подробнее здесь: https://stackoverflow.com/questions/798 ... askarrsize