Dynamic Initialization Guard Library

This library provides kernel implementations of C++ compiler callouts for acquiring/releasing static initializer guard variables:

• __cxa_guard_acquire
• __cxa_guard_release
• __cxa_guard_abort

The purpose of implementing these functions is to detect, at runtime, the use of function scoped static variables. In development builds (i.e. builds where ZX_DEBUG_ASSERT_IMPLEMENTED is true), calling one of these functions after global constructors have executed will result in a kernel panic.

See also validate-kernel-symbols.py.