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Fix search for a good c++ compiler
Bash evaluates "c++{17,14}" as "c++17 c++14", but "c++-{17}" as "c++{17}".
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@ -232,7 +232,8 @@ AC_REQUIRE([AC_PROG_CXXCPP])
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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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AS_HELP_STRING([--enable-cxx-mode],[choose C++ standard (default: 17)]),,
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[enable_cxx_mode={17}]
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dnl put modes in curly braces if there are several of them (ex. {20,17}
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[enable_cxx_mode=17]
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)
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AC_LANG_PUSH(C++)
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