Syntax:
pragma Linker_Alias (
[Entity =>] LOCAL_NAME,
[Target =>] static_string_EXPRESSION);
LOCAL_NAME must refer to an object that is declared at the library level. This pragma establishes the given entity as a linker alias for the given target. It is equivalent to __attribute__((alias)) in GNU C and causes LOCAL_NAME to be emitted as an alias for the symbol static_string_EXPRESSION in the object file, that is to say no space is reserved for LOCAL_NAME by the assembler and it will be resolved to the same address as static_string_EXPRESSION by the linker.
The actual linker name for the target must be used (e.g., the fully encoded name with qualification in Ada, or the mangled name in C++), or it must be declared using the C convention with pragma Import or pragma Export.
Not all target machines support this pragma. On some of them it is accepted only if pragma Weak_External has been applied to LOCAL_NAME.
-- Example of the use of pragma Linker_Alias
package p is
i : Integer := 1;
pragma Export (C, i);
new_name_for_i : Integer;
pragma Linker_Alias (new_name_for_i, "i");
end p;