For building v8 using gn on aix_ppc64, linux_s390x and linux_ppc64.

build/config/gcc/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/sysroot.gni")
 import("//build/toolchain/toolchain.gni")
 
 declare_args() {
@@ skipping 92 matching lines @@
     # See the rpath_for... config above for why this is necessary for component
     # builds. Sanitizers use a custom libc++ where this is also necessary.
     if (is_component_build || using_sanitizer) {
       configs = [ ":rpath_for_built_shared_libraries" ]
     }
     if (current_cpu == "mipsel") {
       ldflags += [ "-pie" ]
     }
   }
 
-  if (!is_android || !use_gold) {
+  if ((!is_android || !use_gold) && current_os != "aix") {
     # Find the path containing shared libraries for this toolchain
     # relative to the build directory. ${root_out_dir} will be a
     # subdirectory of ${root_build_dir} when cross compiling.
     _rpath_link = rebase_path(root_out_dir, root_build_dir)
     if (shlib_subdir != ".") {
       _rpath_link += "/$shlib_subdir"
     }
     if (is_android) {
       _rebased_sysroot = rebase_path(sysroot, root_build_dir)
       _rpath_link += ":$_rebased_sysroot/usr/lib"
     }
 
     ldflags += [
       "-Wl,-rpath-link=$_rpath_link",
 
       # TODO(GYP): Do we need a check on the binutils version here?
       #
       # Newer binutils don't set DT_RPATH unless you disable "new" dtags
       # and the new DT_RUNPATH doesn't work without --no-as-needed flag.
       "-Wl,--disable-new-dtags",
     ]
   }
 }
 
 config("no_exceptions") {
   cflags_cc = [ "-fno-exceptions" ]
   cflags_objcc = cflags_cc
 }