[CMake] Bump CMake minimum version to 3.13.4

This upgrade should be friction-less because we've already been ensuring
that CMake >= 3.13.4 is used.

This is part of the effort discussed on llvm-dev here:

  http://lists.llvm.org/pipermail/llvm-dev/2020-April/140578.html

Differential Revision: https://reviews.llvm.org/D78648

clang/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 if(POLICY CMP0075)
   cmake_policy(SET CMP0075 NEW)

clang/tools/scan-build-py/tests/functional/exec/CMakeLists.txt

@@ -1,6 +1,6 @@
 project(exec C)
 
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 include(CheckCCompilerFlag)
 check_c_compiler_flag("-std=c99" C99_SUPPORTED)

compiler-rt/CMakeLists.txt

@@ -3,7 +3,7 @@
 # An important constraint of the build is that it only produces libraries
 # based on the ability of the host toolchain to target various platforms.
 
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 if(POLICY CMP0075)
   cmake_policy(SET CMP0075 NEW)

compiler-rt/cmake/Modules/CustomLibcxx/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 project(custom-libcxx C CXX)
 
 # Build static libcxxabi.

compiler-rt/lib/builtins/CMakeLists.txt

@@ -3,7 +3,7 @@
 # architecture-specific code in various subdirectories.
 
 if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-  cmake_minimum_required(VERSION 3.4.3)
+  cmake_minimum_required(VERSION 3.13.4)
 
   project(CompilerRTBuiltins C ASM)
   set(COMPILER_RT_STANDALONE_BUILD TRUE)

flang/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.9.0)
+cmake_minimum_required(VERSION 3.13.4)
 
 # RPATH settings on macOS do not affect INSTALL_NAME.
 if (POLICY CMP0068)

libclc/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required( VERSION 3.9.2 )
+cmake_minimum_required(VERSION 3.13.4)
 
 project( libclc VERSION 0.2.0 LANGUAGES CXX )
 include( GNUInstallDirs )

libcxx/CMakeLists.txt

@@ -8,7 +8,7 @@ endif()
 #===============================================================================
 # Setup Project
 #===============================================================================
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 if(POLICY CMP0042)
   cmake_policy(SET CMP0042 NEW) # Set MACOSX_RPATH=YES by default

libcxx/utils/ci/runtimes/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 if(POLICY CMP0068)
   cmake_policy(SET CMP0068 NEW)

libcxxabi/CMakeLists.txt

@@ -8,7 +8,7 @@ endif()
 # Setup Project
 #===============================================================================
 
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 if(POLICY CMP0042)
   cmake_policy(SET CMP0042 NEW) # Set MACOSX_RPATH=YES by default

libunwind/CMakeLists.txt

@@ -2,7 +2,7 @@
 # Setup Project
 #===============================================================================
 
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 if (POLICY CMP0042)
   cmake_policy(SET CMP0042 NEW) # Set MACOSX_RPATH=YES by default

lld/CMakeLists.txt

@@ -1,7 +1,7 @@
 # Check if lld is built as a standalone project.
 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
   project(lld)
-  cmake_minimum_required(VERSION 3.4.3)
+  cmake_minimum_required(VERSION 3.13.4)
 
   set(CMAKE_INCLUDE_CURRENT_DIR ON)
   set(LLD_BUILT_STANDALONE TRUE)

lldb/CMakeLists.txt

@@ -1,7 +1,4 @@
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
-if(CMAKE_SYSTEM_NAME STREQUAL Windows)
-  cmake_minimum_required(VERSION 3.13)
-endif()
 
 if(POLICY CMP0075)
   cmake_policy(SET CMP0075 NEW)

lldb/tools/debugserver/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 project(Debugserver LANGUAGES C CXX ASM-ATT)
 

llvm/CMakeLists.txt

@@ -1,12 +1,6 @@
 # See docs/CMake.html for instructions about how to build LLVM with CMake.
 
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
-
-if ("${CMAKE_VERSION}" VERSION_LESS "3.13.4")
-  message(FATAL_ERROR
-    "Your CMake version is ${CMAKE_VERSION}. The minimum version of CMake "
-    "required to build LLVM is now 3.13.4.")
-endif()
 
 if(POLICY CMP0068)
   cmake_policy(SET CMP0068 NEW)

llvm/docs/CMake.rst

@@ -34,7 +34,7 @@ Quick start
 We use here the command-line, non-interactive CMake interface.
 
 #. `Download <http://www.cmake.org/cmake/resources/software.html>`_ and install
-   CMake. Version 3.4.3 is the minimum required.
+   CMake. Version 3.13.4 is the minimum required.
 
 #. Open a shell. Your development tools must be reachable from this shell
    through the PATH environment variable.
@@ -717,7 +717,7 @@ and uses them to build a simple application ``simple-tool``.
 
 .. code-block:: cmake
 
-  cmake_minimum_required(VERSION 3.4.3)
+  cmake_minimum_required(VERSION 3.13.4)
   project(SimpleProject)
 
   find_package(LLVM REQUIRED CONFIG)

llvm/docs/CMakePrimer.rst

@@ -54,7 +54,7 @@ program. The example uses only CMake language-defined functions.
 
 .. code-block:: cmake
 
-   cmake_minimum_required(VERSION 3.2)
+   cmake_minimum_required(VERSION 3.15)
    project(HelloWorld)
    add_executable(HelloWorld HelloWorld.cpp)
 
@@ -64,13 +64,13 @@ block to define "APPLE" when targeting Apple platforms:
 
 .. code-block:: cmake
 
-   cmake_minimum_required(VERSION 3.2)
+   cmake_minimum_required(VERSION 3.15)
    project(HelloWorld)
    add_executable(HelloWorld HelloWorld.cpp)
    if(APPLE)
      target_compile_definitions(HelloWorld PUBLIC APPLE)
    endif()
-   
+
 Variables, Types, and Scope
 ===========================
 
@@ -93,7 +93,7 @@ example:
    set(var_name var1)
    set(${var_name} foo) # same as "set(var1 foo)"
    set(${${var_name}}_var bar) # same as "set(foo_var bar)"
-   
+
 Dereferencing an unset variable results in an empty expansion. It is a common
 pattern in CMake to conditionally set variables knowing that it will be used in
 code paths that the variable isn't set. There are examples of this throughout
@@ -107,7 +107,7 @@ An example of variable empty expansion is:
      set(extra_sources Apple.cpp)
    endif()
    add_executable(HelloWorld HelloWorld.cpp ${extra_sources})
-   
+
 In this example the ``extra_sources`` variable is only defined if you're
 targeting an Apple platform. For all other targets the ``extra_sources`` will be
 evaluated as empty before add_executable is given its arguments.
@@ -124,7 +124,7 @@ defining lists:
    # Creates a list with members a, b, c, and d
    set(my_list a b c d)
    set(my_list "a;b;c;d")
-   
+
    # Creates a string "a b c d"
    set(my_string "a b c d")
 
@@ -141,7 +141,7 @@ make a list of variable names that refer to other lists. For example:
    set(a 1 2 3)
    set(b 4 5 6)
    set(c 7 8 9)
-   
+
 With this layout you can iterate through the list of lists printing each value
 with the following code:
 
@@ -152,7 +152,7 @@ with the following code:
        message(${value})
      endforeach()
    endforeach()
-   
+
 You'll notice that the inner foreach loop's list is doubly dereferenced. This is
 because the first dereference turns ``list_name`` into the name of the sub-list
 (a, b, or c in the example), then the second dereference is to get the value of
@@ -385,7 +385,7 @@ result in some unexpected behavior if using unreferenced variables. For example:
        message("${var}")
      endforeach()
    endmacro()
-   
+
    set(my_list a b c d)
    set(my_list_of_numbers 1 2 3 4)
    print_list(my_list_of_numbers)

llvm/docs/GettingStarted.rst

@@ -167,7 +167,7 @@ uses the package and provides other details.
 =========================================================== ============ ==========================================
 Package                                                     Version      Notes
 =========================================================== ============ ==========================================
-`CMake <http://cmake.org/>`__                               >=3.4.3      Makefile/workspace generator
+`CMake <http://cmake.org/>`__                               >=3.13.4     Makefile/workspace generator
 `GCC <http://gcc.gnu.org/>`_                                >=5.1.0      C/C++ compiler\ :sup:`1`
 `python <http://www.python.org/>`_                          >=2.7        Automated test suite\ :sup:`2`
 `zlib <http://zlib.net>`_                                   >=1.2.3.4    Compression library\ :sup:`3`

llvm/runtimes/CMakeLists.txt

@@ -7,7 +7,7 @@
 # Setting CMake minimum required version should be at the very top of the file
 # if this is the entry point.
 if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
-  cmake_minimum_required(VERSION 3.4.3)
+  cmake_minimum_required(VERSION 3.13.4)
   project(Runtimes C CXX ASM)
 endif()
 
@@ -56,7 +56,7 @@ if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
     set_property(GLOBAL APPEND PROPERTY SUB_COMPONENTS ${name})
   endfunction()
 
-  cmake_minimum_required(VERSION 3.4.3)
+  cmake_minimum_required(VERSION 3.13.4)
   project(Runtimes C CXX ASM)
 
   find_package(LLVM PATHS "${LLVM_BINARY_DIR}" NO_DEFAULT_PATH NO_CMAKE_FIND_ROOT_PATH)

llvm/utils/benchmark/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.13.4)
 
 # Tell cmake 3.0+ that it's safe to clear the PROJECT_VERSION variable in the
 # call to project() below.

mlir/examples/standalone/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.13.4)
 
 if(POLICY CMP0068)
   cmake_policy(SET CMP0068 NEW)

openmp/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.13.4)
 
 # Add cmake directory to search for custom cmake functions.
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})

openmp/cmake/DetectTestCompiler/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.13.4)
 project(DetectTestCompiler C CXX)
 
 include(CheckCCompilerFlag)

openmp/runtime/cmake/LibompCheckLinkerFlag.cmake

@@ -17,7 +17,7 @@ function(libomp_check_linker_flag flag boolean)
   set(library_source
     "int foo(int a) { return a*a; }")
   set(cmake_source
-    "cmake_minimum_required(VERSION 2.8)
+    "cmake_minimum_required(VERSION 3.13.4)
      project(foo C)
      set(CMAKE_SHARED_LINKER_FLAGS \"${flag}\")
      add_library(foo SHARED src_to_link.c)")

parallel-libs/CMakeLists.txt

@@ -1 +1 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.13.4)

parallel-libs/acxxel/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.1)
+cmake_minimum_required(VERSION 3.13.4)
 
 option(ACXXEL_ENABLE_UNIT_TESTS "enable acxxel unit tests" ON)
 option(ACXXEL_ENABLE_MULTI_DEVICE_UNIT_TESTS "enable acxxel multi-device unit tests" OFF)

polly/CMakeLists.txt

@@ -1,7 +1,7 @@
 # Check if this is a in tree build.
 if (NOT DEFINED LLVM_MAIN_SRC_DIR)
   project(Polly)
-  cmake_minimum_required(VERSION 3.4.3)
+  cmake_minimum_required(VERSION 3.13.4)
 
   # Where is LLVM installed?
   find_package(LLVM CONFIG REQUIRED)

pstl/CMakeLists.txt

@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===----------------------------------------------------------------------===##
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.13.4)
 
 set(PARALLELSTL_VERSION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/include/pstl/internal/pstl_config.h")
 file(STRINGS "${PARALLELSTL_VERSION_FILE}" PARALLELSTL_VERSION_SOURCE REGEX "#define _PSTL_VERSION .*$")