The declaration of Variable length array is causing compilation issues for 17.1.3 compiler.
1 error generated.
gmake[3]: *** [lib/CompileJvm.gmk:170: /home/jenkins/openjdk-suchi/jdk/build/aix-ppc64-server-fastdebug/hotspot/variant-server/libjvm/objs/os_perf_aix.o] Error 1
gmake[2]: *** [make/Main.gmk:245: hotspot-server-libs] Error 2
gmake[2]: *** Waiting for unfinished jobs....

ERROR: Build failed for target 'images' in configuration 'aix-ppc64-server-fastdebug' (exit code 2)
Stopping javac server

=== Output from failing command(s) repeated here ===
* For target hotspot_variant-server_libjvm_objs_os_perf_aix.o:
/home/jenkins/openjdk-suchi/jdk/src/hotspot/os/aix/os_perf_aix.cpp:79:12: error: variable length arrays in C++ are a Clang extension [-Werror,-Wvla-cxx-extension]
   79 | char buf[BUF_LENGTH];
      | ^~~~~~~~~~
/home/jenkins/openjdk-suchi/jdk/src/hotspot/os/aix/os_perf_aix.cpp:79:12: note: read of non-const variable 'BUF_LENGTH' is not allowed in a constant expression
/home/jenkins/openjdk-suchi/jdk/src/hotspot/os/aix/os_perf_aix.cpp:76:17: note: declared here
   76 | static size_t BUF_LENGTH = 32 + sizeof(u_longlong_t);
      | ^