esp-idf/tools/test_apps/system/cxx_build_test/README.md

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# C++ build test
This build-only app can be used to check if certain headers, macros or features can be successfully compiled in a C++ source file.
To add a new test, create a new file `main/test_<name>.cpp` and add it to main/CMakeLists.txt.
If you need to check specific compiler flags, use `set_source_files_properties` CMake function to adjust the compilation flags for the given source file.