[all-commits] [llvm/llvm-project] 936410: Illustrate a redirector using the example of round...

[Siva Chandra via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 9364107cf348c7d4a2d05b8906bda6ba384ce6f6
      https://github.com/llvm/llvm-project/commit/9364107cf348c7d4a2d05b8906bda6ba384ce6f6
  Author: Siva Chandra Reddy <sivachandra at google.com>
  Date:   2019-11-01 (Fri, 01 Nov 2019)

  Changed paths:
    M libc/cmake/modules/LLVMLibCRules.cmake
    M libc/docs/build_system.rst
    A libc/docs/redirectors.rst
    A libc/docs/redirectors_schematic.svg
    M libc/lib/CMakeLists.txt
    M libc/src/CMakeLists.txt
    A libc/src/math/CMakeLists.txt
    A libc/src/math/round/CMakeLists.txt
    A libc/src/math/round/round.cpp
    A libc/src/math/round/round.h
    A libc/src/math/round/round_redirector.cpp

  Log Message:
  -----------
  Illustrate a redirector using the example of round function from math.h.

Setup demonstrated in this patch is only for ELF-ish platforms.

Also note:

1. Use of redirectors is a temporary scheme. They will be removed once
   LLVM-libc has implementations for the redirected functions.
2. Redirectors are optional. One can choose to not include them in the
   LLVM-libc build for their platform.
3. Even with redirectors used, we want to link to the system libc
   dynamically.

Reviewers: dlj, hfinkel, jakehehrlich, phosek, stanshebs, theraven, alexshap

Subscribers: mgorny, libc-commits

Tags: #libc-project

Differential Revision: https://reviews.llvm.org/D69020