/in/foo.cc:10: warning: "M_PI_4" redefined
   10 | #define M_PI_4     0.785398163397448309616  // pi/4
      | 
In file included from /usr/include/c++/12/cmath:45,
                 from /in/foo.cc:3:
/usr/include/math.h:1153: note: this is the location of the previous definition
 1153 | # define M_PI_4         0.78539816339744830962  /* pi/4 */
      | 
/in/foo.cc:11: warning: "M_1_PI" redefined
   11 | #define M_1_PI     0.318309886183790671538  // 1/pi
      | 
/usr/include/math.h:1154: note: this is the location of the previous definition
 1154 | # define M_1_PI         0.31830988618379067154  /* 1/pi */
      | 
/in/foo.cc:12: warning: "M_2_PI" redefined
   12 | #define M_2_PI     0.636619772367581343076  // 2/pi
      | 
/usr/include/math.h:1155: note: this is the location of the previous definition
 1155 | # define M_2_PI         0.63661977236758134308  /* 2/pi */
      |