Constructors of static class instances are not called

[zapta]

Per the discussion at https://community.platformio.org/t/class-constructor-is-not-called-for-global-instances/29100

The test program

class A {
  public:
    A(int val): val_(val) {}
    int val_;
};

A a1(11);
int b = 123;

void main(void) {
  A a2(22);
  printk("a1.val_=%d, a2.val_=%d, b=%d\n", a1.val_, a2.val_, b);
}

Prints

a1.val_=0, a2.val_=22, b=123

Notice that a1.val=0 which suggests that the constructor of the static instance a1 was not called (but was called correctly for the local a2).

My platformio.io is

[env:nrf52_dk]
platform = nordicnrf52
board = nrf52_dk
framework = zephyr
debug_tool = jlink
monitor_speed = 115200
monitor_port = COM7
debug_build_flags = -O0 -g -ggdb
build_flags =
  -I .pio/build/nrf52_dk/zephyr/include/generated
extra_scripts = extra_script.py