[CMake] Update to requiring CMake 3.4.3

Summary: This is as per the discussions on developer lists: http://lists.llvm.org/pipermail/llvm-dev/2016-April/098780.html http://lists.llvm.org/pipermail/llvm-dev/2016-May/100058.html Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D20822 llvm-svn: 271325
llvm · May 31, 2016 · b471191 · b471191
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commit b471191
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Showing 3 changed files with 7 additions and 5 deletions.
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
@@ -1,6 +1,6 @@
 # See docs/CMake.html for instructions about how to build LLVM with CMake.
 
-cmake_minimum_required(VERSION 2.8.12.2)
+cmake_minimum_required(VERSION 3.4.3)
 
 if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   message(STATUS "No build type selected, default to Debug")

diff --git a/llvm/docs/CMake.rst b/llvm/docs/CMake.rst
@@ -561,7 +561,7 @@ and uses them to build a simple application ``simple-tool``.
 
 .. code-block:: cmake
 
-  cmake_minimum_required(VERSION 2.8.8)
+  cmake_minimum_required(VERSION 3.4.3)
   project(SimpleProject)
 
   find_package(LLVM REQUIRED CONFIG)

diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
@@ -83,9 +83,11 @@ Here's the short story for getting up and running quickly with LLVM:
    before trying to configure with cmake.  cmake does not pickup newly
    added source directories in incremental builds. 
 
-   The build uses `CMake <CMake.html>`_.
-   Although the build is known to work with CMake >= 2.8.8, we recommend CMake
-   >= v3.2, especially if you're generating Ninja build files.
+   The build uses `CMake <CMake.html>`_. LLVM requires CMake 3.4.3 to build. It
+   is generally recommended to use a recent CMake, especially if you're
+   generating Ninja build files. This is because the CMake project is constantly
+   improving the quality of the generators, and the Ninja generator gets a lot
+   of attention.
 
    * ``cd where you want to build llvm``
    * ``mkdir build``