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@@ -1661,3 +1661,11 @@ AC_MSG_NOTICE([
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GCC plug-in test suite (requires GNU Guile): $run_gcc_plugin_test_suite
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SOCL enabled: $build_socl
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])
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+
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+if test x"$have_valid_hwloc" = xno
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+then
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+ AC_MSG_NOTICE([
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+WARNING: hwloc was not enabled. If the target machine is hyperthreaded the
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+performance may be impacted a lot. It is strongly recommended to install
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+hwloc])
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+fi
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