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#include <iostream>
using namespace std;
 
struct structure __attribute__ (packed) {
	char a;
	int b;
	char c;
};
 
int main() {
 
	std::cout << sizeof(struct structure) << '\n';
 
	return 0;
}

prog.cpp:4:33: error: expected ‘(’ before ‘packed’
 struct structure __attribute__ (packed) {
                                 ^
prog.cpp:4:41: error: expected ‘)’ before ‘{’ token
 struct structure __attribute__ (packed) {
                                         ^
prog.cpp:4:8: warning: attribute ignored in declaration of ‘struct structure’ [-Wattributes]
 struct structure __attribute__ (packed) {
        ^
prog.cpp:4:8: note: attribute for ‘struct structure’ must follow the ‘struct’ keyword
prog.cpp: In function ‘int main()’:
prog.cpp:12:38: error: invalid application of ‘sizeof’ to incomplete type ‘structure’
  std::cout << sizeof(struct structure) << '\n';
                                      ^

Standard output is empty