This function attribute enables you to specify multiple aliases for functions.

Where a function is defined in the current translation unit, the alias call is replaced by a call to the function, and the alias is emitted alongside the original name. Where a function is not defined in the current translation unit, the alias call is replaced by a call to the real function. Where a function is defined as static, the function name is replaced by the alias name and the function is declared external if the alias name is declared external.

return-type newname([argument-list]) __attribute__((alias("oldname")));

#include <stdio.h>
void foo(void)
{
    printf("%s\n", __FUNCTION__);
}
void bar(void) __attribute__((alias("foo")));
void gazonk(void)
{
    bar(); // calls foo
}