gcc -Wshadow 选项的更细粒度行为

gcc -Wshadow选项的更细粒度行为

c
#include 
int main() {
    int x = 5;
    
    if (x > 0) {
        int x = 10;
        printf("内部作用域中的x：%d\n", x);
    }
    
    printf("外部作用域中的x：%d\n", x);
    
    return 0;
}

shell
$ gcc -Wshadow shadow.c -o shadow
shadow.c: In function ‘main’:
shadow.c:8:9: warning: declaration of ‘x’ shadows a previous local [-Wshadow]
         int x = 10;
         ^~~~
shadow.c:4:9: note: shadowed declaration is here
     int x = 5;
     ^~~~