$ ../cpla.sh p135-2
$ clang++ p135-2.cpp -std=c++03 -Wall
p135-2.cpp:14:13: warning: range-based for loop is a C++11 extension [-Wc++11-extensions]
for (int& x : array){
            ^
1 warning generated.
x=2
x=4
x=6
x=8
x=10
C++N4741(68)9.5.4 The range-based for statement [stmt.ranged]p135-2.cpp
$ clang++ p135-2.cpp -std=c++2a -Wall
x=2
x=4
x=6
x=8
x=10
C++N4741(68)9.5.4 The range-based for statement [stmt.ranged]p135-2.cpp

$ g++-8 p135-2.cpp -std=c++03  -Wall
p135-2.cpp: In function 'int main()':
p135-2.cpp:14:15: warning: range-based 'for' loops only available with -std=c++11 or -std=gnu++11
 for (int& x : array){
               ^~~~~
p135-2.cpp:15:3: warning: 'x' is used uninitialized in this function [-Wuninitialized]
 x *= 2;
 ~~^~~~
../cpla.sh: line 17:  4884 Bus error: 10           ./$1g03 $2

$ g++-8 p135-2.cpp -std=c++2a  -Wall
x=2
x=4
x=6
x=8
x=10
C++N4741(68)9.5.4 The range-based for statement [stmt.ranged]p135-2.cpp