From 70eec9001a550888f35476f9e2cf3c62d41442dd Mon Sep 17 00:00:00 2001
From: Matthias Baesken <mbaesken@openjdk.org>
Date: Mon, 27 Jan 2025 07:35:40 +0000
Subject: [PATCH] 8338303: Linux ppc64le with toolchain clang - detection
 failure in early JVM startup

Reviewed-by: mdoerr, erikj, ihse
---
 make/autoconf/flags-cflags.m4 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/make/autoconf/flags-cflags.m4 b/make/autoconf/flags-cflags.m4
index 729e508cc26..7f2a783576e 100644
--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2024, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -736,6 +736,11 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
         # for all archs except arm and ppc, prevent gcc to omit frame pointer
         $1_CFLAGS_CPU_JDK="${$1_CFLAGS_CPU_JDK} -fno-omit-frame-pointer"
       fi
+      if test "x$FLAGS_CPU" = xppc64le; then
+        # Little endian machine uses ELFv2 ABI.
+        # Use Power8, this is the first CPU to support PPC64 LE with ELFv2 ABI.
+        $1_CFLAGS_CPU_JVM="${$1_CFLAGS_CPU_JVM} -DABI_ELFv2 -mcpu=power8 -mtune=power8"
+      fi
     fi
     if test "x$OPENJDK_TARGET_OS" = xaix; then
       $1_CFLAGS_CPU="-mcpu=pwr8"