Problem:
You encounter a GCC error message of the form
error: declaration of ... shadows a parameter
Somewhere in your code you have a function with an argument
void doSomething(int arg) {/*...*/}However, somewhere in the function you want to declare a variable that has the same name as one of the function argument.
Declaring a variable with a name that already refers to another variable is called shadowing. In this case, you shadow a function argument.
For example, in
void doSomething(int arg) {
char* arg = "";
}
char* arg shadows the function argument int arg
Identifying the cause:
The file and the line number refer to the declaration of the variable that shadows the argument.
Resolving the error:
Rename the variable that shadows the argument or rename the argument itself
In the above example, you’d need to rename either char arg (e.g. to char arg2) or int arg,