I seldom see issues porting C and C++ to ARM unless people do weird things with casts that are undefined in the language spec but that work on X86 or use X86-sp

I seldom see issues porting C and C++ to ARM unless people do weird things with casts that are undefined in the language spec but that work on X86 or use X86-specific vector intrinsics. Most well-written C and C++ compiles out of the box to ARM and just works.