What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

The following code has an interesting form of undefined behavior:

#define STR_START "
#define STR_END "

int puts(const char *);

int main() {
 puts(STR_START hello world STR_END);

The C standard only specifies minimum limits for the values of character types and standard integer types. This makes it possible to generate efficient code on diverse architectures, but can pose problematic if your code expects the limits to match your development platform, or if you have to do low-level things.

Before C99, the usual way to solve this was to use typedef to declare synonyms

See also, http://libraryofalexandria.io/cgo/

cgo has a lot of trap.
but Not "C" pkg also directory in $GOROOT/src. IDE's(vim) Goto command not works.

So, Here collect materials.