RFR: 8302460: System C++ Compiler for cross compiling gcc is dangerously wrong

[Julian Waters]

On Wed, 15 Feb 2023 15:38:26 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> But that still leaves my question unanswered: So then the question is: do you have CC on your path? You say "CC ends up resolving", but who is doing that resolving?

I just checked on my WSL install and not only is `CC` not in the path, it doesn't seem like `CC` is anywhere to be found in the first place. When configure asks for something named `CC`, it's likely the shell itself used in the build finding the lowercase `cc` in the path instead after not being able to find the uppercase version and calling it a day, to answer the question of what is returning the build compiler to be used. You're probably right that it should have a lower priority than fully removed, but I'm not so sure about the priorities `c++` and `g++` should take, as proposed (`g++ c++ CC` as opposed to `c++ g++ CC`)

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PR: https://git.openjdk.org/jdk/pull/12558