Why is this an issue?

To make the code more readable, all libraries should be written with the same case.

Default is lowercase, but you can move to uppercase through the case parameter.

How to fix it

Code examples

Noncompliant code example

With the default value for the case parameter: lowercase

library IEEE; -- Noncompliant
use IEEE.std_logic_1164.all; -- Noncompliant

Compliant solution

With the default value for the case parameter: lowercase

library ieee;
use ieee.std_logic_1164.all;