RFR: 8328146: Set LIBCXX automatically [v3]

[Erik Joelsson]

On Thu, 14 Mar 2024 14:03:07 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> We are adding LIBCXX to LIBS in calls to SetupJdkLibrary whenever LINK_TYPE is C++. We should do this automatically in SetupJdkLibrary for C++ linking.
>> 
>> I also removed the superfluous `-lc` from some places where it had been added.
>
> Magnus Ihse Bursie has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:
> 
>  - Merge branch 'master' into set-libcxx-automatically
>  - Fix extra space
>  - Restore $(LIBCXX) in tests since they don't use SetupJdkLibrary.
>  - 8328146: Set LIBCXX automatically

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/18298#pullrequestreview-1938855360