Hi Alex, It looks like Sam James has already documented level 3 of the macro. The attached (no, git send-email is not happy with my proxy setup) patch only adds some language related to clang. Here's to hoping the system is happy with multipart mail. I've CCed Erik Pilington, since he is the author of the LLVM-svn 352665, the change that introduced __builtin_dynamic_object_size() in 2019. Regards, Mingye Wang
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0001-feature_test_macros.7-document-clang-fortify-support.patch
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