cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations math/M_SQRT1_2l.c -o math/M_SQRT1_2l -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt 
relibc getrlimit(3, 0x7ffffffffc80): not implemented
relibc getrlimit(3, 0x7ffffffffbb0): not implemented
relibc getrlimit(9, 0x7ffffffffb70): not implemented
relibc getrlimit(9, 0x7ffffffffba0): not implemented
relibc getrlimit(5, 0x7ffffffffba0): not implemented
relibc getrlimit(9, 0x7ffffffffb70): not implemented
math/M_SQRT1_2l.c:8:26: error: 'M_SQRT1_2l' undeclared here (not in a function)
    8 | long double  const foo = M_SQRT1_2l;
      |                          ^~~~~~~~~~