Clang has supported _FORTIFY_SOURCE since version 10. We already use it when building with gcc ([JDK-8130017](https://bugs.openjdk.org/browse/JDK-8130017)) in fastdebug builds. We should add it to fastdebug builds with Clang.
I solved this by unifying the clang/gcc flag setup. ------------- Commit messages: - 8285692: Enable _FORTIFY_SOURCE=2 when building with Clang Changes: https://git.openjdk.org/jdk/pull/22586/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22586&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8285692 Stats: 23 lines in 1 file changed: 7 ins; 15 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/22586.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22586/head:pull/22586 PR: https://git.openjdk.org/jdk/pull/22586
