================ @@ -1073,6 +1073,28 @@ inputs. Here is some example of ``$``-prefixed options: Language and Target-Independent Features ======================================== +Freestanding Builds +------------------- +Passing the ``-ffreestanding`` flag causes Clang to build for a freestanding +(rather than a hosted) environment. The flag has the following effects: + +* the ``__STDC_HOSTED__`` predefined macro will expand to ``0``, +* builtin functions are disabled (``-fno-builtins``), +* unwind tables are disabled (``fno-asynchronous-unwind-tables -fno-unwind-tables``), and +* allows ``main`` to be used as a regular symbol. + +A freestanding environment is not one which has no C standard library support. ---------------- AaronBallman wrote:
I was aiming to let users know what Clang does & expects of you when `-ffreestanding` is passed. The primary thing is: freestanding does not mean "I don't need any C standard library", it means "I need a freestanding-compatible C standard library that includes a few functions that are expected to be available even in older language modes where they weren't in freestanding before." https://github.com/llvm/llvm-project/pull/132232 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
