– Call `cc_compile(input, options, scrip, message_handler)` instead of  `cc_compile(input, scrip)`
– Read the error and warning(s) that the compiler issues from the `message_handler` instead of from static variables
– Avoid `ccSetOption()`, pass the respective options directly to the compiler so that they are safe from being clobbered before the compiler can read them
– Avoid reading the static variables `currentline` and `ccCurScriptName`

Make googletests use the new compiler calling convention
use `compile(source, options, scrip, messages)`

Provide the bytes that the test should generate