How to compile C code with anonymous structs / unions?
anonymous-class, anonymous-struct, c, c++, unions
Solution
according to http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed-Fields
`-fms-extensions` will enable the feature you (and I) want.
Problem
I can do this in c++/g++: ``` struct vec3 { union { struct { float x, y, z; }; float xyz[3]; }; }; ``` Then, ``` vec3 v; assert(&v.xyz[0] == &v.x); assert(&v.xyz[1] == &v.y); assert(&v.xyz[2] == &v.z); ``` will work. How does one do this in c with gcc? I have ``` typedef struct { union { struct { float x, y, z; }; float xyz[3]; }; } Vector3; ``` But I get errors all around, specifically ``` line 5: warning: declaration does not declare anything line 7: warning: declaration does not declare anything ```