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Autotools: use C++17 mode when available
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@ -270,8 +270,8 @@ AC_REQUIRE([AC_PROG_CXXCPP])
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### We might want to force the C++ standard.
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### We might want to force the C++ standard.
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AC_ARG_ENABLE(cxx-mode,
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AC_ARG_ENABLE(cxx-mode,
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AS_HELP_STRING([--enable-cxx-mode],[choose C++ standard (default: 14, then 11)]),,
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AS_HELP_STRING([--enable-cxx-mode],[choose C++ standard (default: 17, 14, then 11)]),,
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[enable_cxx_mode={14,11}]
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[enable_cxx_mode={17,14,11}]
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)
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)
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AC_LANG_PUSH(C++)
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AC_LANG_PUSH(C++)
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