libstdc++-v3/src/c++98/ios_base_init.h

   1 // This is only in a header so we can use the system_header pragma,
   2 // to suppress the warning caused by using a reserved init_priority.
   3 #pragma GCC system_header
   4
   5 // If the target supports init priorities, set up a static object in the
   6 // compiled library to perform the <iostream> initialization once and
   7 // sufficiently early (so that it happens before any other global
   8 // constructor when statically linking with libstdc++.a), instead of
   9 // doing so in (each TU that includes) <iostream>.
  10 #if __has_attribute(init_priority)
  11 static ios_base::Init __ioinit __attribute__((init_priority(90)));
  12 #endif