[PATCH] D80436: [clang][docs] Document additional bits of libc that -ffreestanding envs must provide

[Jon Roelofs via Phabricator via cfe-commits]

jroelofs created this revision.
jroelofs added reviewers: jyknight, echristo.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

See also discussion following: http://lists.llvm.org/pipermail/llvm-dev/2012-May/050098.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80436

Files:
  clang/docs/CommandGuide/clang.rst


Index: clang/docs/CommandGuide/clang.rst
===================================================================
--- clang/docs/CommandGuide/clang.rst
+++ clang/docs/CommandGuide/clang.rst
@@ -246,7 +246,9 @@
 .. option:: -ffreestanding
 
  Indicate that the file should be compiled for a freestanding, not a hosted,
- environment.
+ environment. Note that it is assumed that a freestanding environment will
+ additionally provide `memcpy`, `memmove`, `memset` and `memcmp`
+ implementations, as these are needed for efficient codegen for many programs.
 
 .. option:: -fno-builtin
 


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