File: s390x-opt.diff

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openjdk-21 21.0.8%2B9-1
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--- a/make/autoconf/flags-cflags.m4
+++ b/make/autoconf/flags-cflags.m4
@@ -821,6 +821,9 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
       fi
     elif test "x$FLAGS_CPU" = xs390x; then
       $1_CFLAGS_CPU="-mbackchain -march=z10"
+      if test "x$VENDOR_FLAGS_CPU" != x; then
+        $1_CFLAGS_CPU="-mbackchain $VENDOR_FLAGS_CPU"
+      fi
     fi
 
     if test "x$FLAGS_CPU_ARCH" != xarm &&  test "x$FLAGS_CPU_ARCH" != xppc; then