_configtest.c:1:5: warning: conflicting types for built-in function ‘sin’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    1 | int sin (void);
      |     ^~~
_configtest.c:1:1: note: ‘sin’ is declared in header ‘<math.h>’
  +++ |+#include <math.h>
    1 | int sin (void);
_configtest.c:2:5: warning: conflicting types for built-in function ‘cos’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    2 | int cos (void);
      |     ^~~
_configtest.c:2:5: note: ‘cos’ is declared in header ‘<math.h>’
_configtest.c:3:5: warning: conflicting types for built-in function ‘tan’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    3 | int tan (void);
      |     ^~~
_configtest.c:3:5: note: ‘tan’ is declared in header ‘<math.h>’
_configtest.c:4:5: warning: conflicting types for built-in function ‘sinh’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    4 | int sinh (void);
      |     ^~~~
_configtest.c:4:5: note: ‘sinh’ is declared in header ‘<math.h>’
_configtest.c:5:5: warning: conflicting types for built-in function ‘cosh’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    5 | int cosh (void);
      |     ^~~~
_configtest.c:5:5: note: ‘cosh’ is declared in header ‘<math.h>’
_configtest.c:6:5: warning: conflicting types for built-in function ‘tanh’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    6 | int tanh (void);
      |     ^~~~
_configtest.c:6:5: note: ‘tanh’ is declared in header ‘<math.h>’
_configtest.c:7:5: warning: conflicting types for built-in function ‘fabs’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    7 | int fabs (void);
      |     ^~~~
_configtest.c:7:5: note: ‘fabs’ is declared in header ‘<math.h>’
_configtest.c:8:5: warning: conflicting types for built-in function ‘floor’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    8 | int floor (void);
      |     ^~~~~
_configtest.c:8:5: note: ‘floor’ is declared in header ‘<math.h>’
_configtest.c:9:5: warning: conflicting types for built-in function ‘ceil’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
    9 | int ceil (void);
      |     ^~~~
_configtest.c:9:5: note: ‘ceil’ is declared in header ‘<math.h>’
_configtest.c:10:5: warning: conflicting types for built-in function ‘sqrt’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   10 | int sqrt (void);
      |     ^~~~
_configtest.c:10:5: note: ‘sqrt’ is declared in header ‘<math.h>’
_configtest.c:11:5: warning: conflicting types for built-in function ‘log10’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   11 | int log10 (void);
      |     ^~~~~
_configtest.c:11:5: note: ‘log10’ is declared in header ‘<math.h>’
_configtest.c:12:5: warning: conflicting types for built-in function ‘log’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   12 | int log (void);
      |     ^~~
_configtest.c:12:5: note: ‘log’ is declared in header ‘<math.h>’
_configtest.c:13:5: warning: conflicting types for built-in function ‘exp’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   13 | int exp (void);
      |     ^~~
_configtest.c:13:5: note: ‘exp’ is declared in header ‘<math.h>’
_configtest.c:14:5: warning: conflicting types for built-in function ‘asin’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   14 | int asin (void);
      |     ^~~~
_configtest.c:14:5: note: ‘asin’ is declared in header ‘<math.h>’
_configtest.c:15:5: warning: conflicting types for built-in function ‘acos’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   15 | int acos (void);
      |     ^~~~
_configtest.c:15:5: note: ‘acos’ is declared in header ‘<math.h>’
_configtest.c:16:5: warning: conflicting types for built-in function ‘atan’; expected ‘double(double)’ [-Wbuiltin-declaration-mismatch]
   16 | int atan (void);
      |     ^~~~
_configtest.c:16:5: note: ‘atan’ is declared in header ‘<math.h>’
_configtest.c:17:5: warning: conflicting types for built-in function ‘fmod’; expected ‘double(double,  double)’ [-Wbuiltin-declaration-mismatch]
   17 | int fmod (void);
      |     ^~~~
_configtest.c:17:5: note: ‘fmod’ is declared in header ‘<math.h>’
_configtest.c:18:5: warning: conflicting types for built-in function ‘modf’; expected ‘double(double,  double *)’ [-Wbuiltin-declaration-mismatch]
   18 | int modf (void);
      |     ^~~~
_configtest.c:18:5: note: ‘modf’ is declared in header ‘<math.h>’
_configtest.c:19:5: warning: conflicting types for built-in function ‘frexp’; expected ‘double(double,  int *)’ [-Wbuiltin-declaration-mismatch]
   19 | int frexp (void);
      |     ^~~~~
_configtest.c:19:5: note: ‘frexp’ is declared in header ‘<math.h>’
_configtest.c:20:5: warning: conflicting types for built-in function ‘ldexp’; expected ‘double(double,  int)’ [-Wbuiltin-declaration-mismatch]
   20 | int ldexp (void);
      |     ^~~~~
_configtest.c:20:5: note: ‘ldexp’ is declared in header ‘<math.h>’