RFR: 8256977: Bump minimum GCC from 5.x to 6 for JDK

Thu Sep 9 19:38:35 UTC 2021

The minimum acceptable version is raised from 5 to 6. There were no objections on the mailing list for doing so in the mainline, see https://mail.openjdk.java.net/pipermail/build-dev/2021-August/031899.html.

This patch also reverts the workaround that was introduced in JDK-8252797 to support gcc 5.x.

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Commit messages:
 - 8256977: Bump minimum GCC from 5.x to 6 for JDK

Changes: https://git.openjdk.java.net/jdk/pull/5452/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5452&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256977
  Stats: 5 lines in 2 files changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5452.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5452/head:pull/5452

PR: https://git.openjdk.java.net/jdk/pull/5452