Squashed 'libs/cli11/' content from commit dcbcb47

git-subtree-dir: libs/cli11
git-subtree-split: dcbcb4721dda5dab0a56d9faaaee50e6a30f7758

tests/mesonTest/README.md

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+# CLI11 Meson test / example
+
+Requirements: meson, ninja
+
+## Build
+
+```bash
+meson build
+ninja -C build
+```

tests/mesonTest/main.cpp

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+// Copyright (c) 2017-2021, University of Cincinnati, developed by Henry Schreiner
+// under NSF AWARD 1414736 and by the respective contributors.
+// All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include <CLI/CLI.hpp>
+
+int main(int argc, char **argv) {
+    CLI::App app{"App description"};
+
+    std::string filename = "default";
+    app.add_option("-f,--file", filename, "A help string");
+
+    CLI11_PARSE(app, argc, argv);
+    return 0;
+}

tests/mesonTest/meson.build

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+project('mesonTest', ['c', 'cpp'], default_options: ['cpp_std=c++11'])
+
+cli11_dep = subproject('CLI11').get_variable('CLI11_dep')
+
+mainExe = executable('main', ['main.cpp'], dependencies: [cli11_dep])