xiaoxiang781216 edited a comment on issue #131: Improve config URL: https://github.com/apache/incubator-nuttx/pull/131#issuecomment-579714930 The key point is the mismatch size_t definition between toolchain(NOT newlib/glibc) and NuttX, the fix could be: 1. Provide the different new/delete prototype base on CONFIG_CXX_NEWLONG, the drawback is that: - We have to change defconfig again and again since the different toolchain may provide the different size_t definition. - new/delete is provided by libcxx/uClibc++ if we enable them, or even user code can provide their own implementation to overwrite the default one per C++ standard. It's ugly to demand 3rd party to hack their standard compliance code. - Note: to fix the 2nd issue, it's better to change CONFIG_CXX_NEWLONG to CONFIG_SIZE_T_LONG and change size_t typedef directly, so all location which use size_t as argument could get fixed automatically. 2. Ensure NuttX use the same size_t definition as toolchain, which could be achieved by: - Use the compiler provide the header file directly, it isn't a big issue at least for gcc/clang because stddef.h is self contain as I mention in the prevous comment. Actually, I suggest we should use all header files provided by compiler(e.g. float.h, stdarg.h, stdbool.h, stddef.h...) to aovid any potential conflict. - Define size_t to __SIZE_TYPE__(at least gcc/clang define it) if __SIZE_TYPE__ is defined: https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
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