RFR: JDK-8329257: AIX: Switch HOTSPOT_TOOLCHAIN_TYPE from xlc to gcc [v3]

[Thomas Stuefe]

On Tue, 2 Apr 2024 16:14:12 GMT, Joachim Kern <jkern at openjdk.org> wrote:

>> As of [JDK-8325880](https://bugs.openjdk.org/browse/JDK-8325880), building the JDK requires version 17 of IBM Open XL C/C++ (xlc). This is in effect clang by another name, and it uses the clang toolchain in the JDK build. Thus the old xlc toolchain was removed by [JDK-8327701](https://bugs.openjdk.org/browse/JDK-8327701).
>> Now we also switch the HOTSPOT_TOOLCHAIN_TYPE from xlc to gcc, removing the last xlc rudiment.
>> This means merging the AIX specific content of utilities/globalDefinitions_xlc.hpp and utilities/compilerWarnings_xlc.hpp into the corresponding gcc files on the on side and removing the defined(TARGET_COMPILER_xlc) blocks in the code, because the defined(TARGET_COMPILER_gcc) blocks work out of the box for the new AIX compiler.
>> The rest of the changes are needed because of using utilities/compilerWarnings_gcc.hpp the compiler is much more nagging about ill formatted printf
>
> Joachim Kern has updated the pull request incrementally with one additional commit since the last revision:
> 
>   version check not needed anymore

src/hotspot/os_cpu/aix_ppc/os_aix_ppc.cpp line 440:

> 438:   st->print("pc =" INTPTR_FORMAT "  ", (unsigned long)uc->uc_mcontext.jmp_context.iar);
> 439:   st->print("lr =" INTPTR_FORMAT "  ", (unsigned long)uc->uc_mcontext.jmp_context.lr);
> 440:   st->print("ctr=" INTPTR_FORMAT "  ", (unsigned long)uc->uc_mcontext.jmp_context.ctr);

p2i

src/hotspot/os_cpu/aix_ppc/os_aix_ppc.cpp line 443:

> 441:   st->cr();
> 442:   for (int i = 0; i < 32; i++) {
> 443:     st->print("r%-2d=" INTPTR_FORMAT "  ", i, (unsigned long)uc->uc_mcontext.jmp_context.gpr[i]);

p2i

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PR Review Comment: https://git.openjdk.org/jdk/pull/18536#discussion_r1558017408
PR Review Comment: https://git.openjdk.org/jdk/pull/18536#discussion_r1558017827