__GNUC__           11 core/ngx_cpuinfo.c #if (( __i386__ || __amd64__ ) && ( __GNUC__ || __INTEL_COMPILER ))
__GNUC__           67 os/unix/ngx_gcc_atomic_x86.h #if !(( __GNUC__ == 2 && __GNUC_MINOR__ <= 7 ) || ( __INTEL_COMPILER >= 800 ))