RFR: JDK-8307349: Support xlc17 clang toolchain on AIX

Wed May 10 11:17:24 UTC 2023

On Wed, 10 May 2023 11:01:24 GMT, JoKern65 <duke at openjdk.org> wrote:

> The new xlc17 compiler should be supported to build OpenJDK on AIX. This compiler, compared to the currently supported xlc16, has a significantly more recent clang (xlc 17.1.1 uses clang 15) included.
> 1. Because the frontend interface of the new compiler (c-flags, Ld-Flags) has changed from an xlc to a clang interface we decided to use the clang toolchain for the new xlc17 compiler.
> 2. Unfortunately, the system headers are mainly unchanged, so they do not harmonize with the src/hotspot/share/utilities/globalDefinitions_gcc.hpp which would be used if we totally switch to clang toolchain. So we keep the HOTSPOT_TOOLCHAIN_TYPE=xlc
> 3. In src/hotspot/share/utilities/globalDefinitions_xlc.hpp we introduce a new define AIX_XLC_GE_17 which is set if we build with the new xlc17 on AIX. This define will be used in following PRs.

The copyright year info needs updating to 2023 in some files (please look at the start of the files).
e.g. make/autoconf/flags-ldflags.m4

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PR Comment: https://git.openjdk.org/jdk/pull/13898#issuecomment-1541980514