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

[Matthias Baesken]

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.

src/hotspot/share/utilities/globalDefinitions_xlc.hpp line 1:

> 1: /*

#if __open_xl_version__ < 17
  #error "xlc < 16 not supported"
  #endif

Should this be xlc < 17 in the error ?

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PR Review Comment: https://git.openjdk.org/jdk/pull/13898#discussion_r1189887724