[CMake] Cleaning up CMake version checks in ExternalProject calls

Now that we're on CMake 3.4.3 all the ExternalProject features we use are supported everywhere, so we don't need the version checks anymore.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@272324 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -632,19 +632,6 @@ configure_file(
 if (CLANG_ENABLE_BOOTSTRAP)
   include(ExternalProject)
 
-  if(CMAKE_VERSION VERSION_GREATER 3.1.0)
-    set(cmake_3_1_EXCLUDE_FROM_ALL EXCLUDE_FROM_ALL 1)
-  endif()
-
-  if(CMAKE_VERSION VERSION_GREATER 3.3.20150708)
-    set(cmake_3_4_USES_TERMINAL_OPTIONS
-      USES_TERMINAL_CONFIGURE 1
-      USES_TERMINAL_BUILD 1
-      USES_TERMINAL_INSTALL 1
-      )
-    set(cmake_3_4_USES_TERMINAL USES_TERMINAL 1)
-  endif()
-
   if(NOT CLANG_STAGE)
     set(CLANG_STAGE stage1)
     message(STATUS "Setting current clang stage to: ${CLANG_STAGE}")
@@ -770,7 +757,7 @@ if (CLANG_ENABLE_BOOTSTRAP)
     SOURCE_DIR ${CMAKE_SOURCE_DIR}
     STAMP_DIR ${STAMP_DIR}
     BINARY_DIR ${BINARY_DIR}
-    ${cmake_3_1_EXCLUDE_FROM_ALL}
+    EXCLUDE_FROM_ALL 1
     CMAKE_ARGS
                 # We shouldn't need to set this here, but INSTALL_DIR doesn't
                 # seem to work, so instead I'm passing this through
@@ -783,7 +770,9 @@ if (CLANG_ENABLE_BOOTSTRAP)
     CMAKE_COMMAND ${cmake_command}
     INSTALL_COMMAND ""
     STEP_TARGETS configure build
-    ${cmake_3_4_USES_TERMINAL_OPTIONS}
+    USES_TERMINAL_CONFIGURE 1
+    USES_TERMINAL_BUILD 1
+    USES_TERMINAL_INSTALL 1
     )
 
   # exclude really-install from main target
@@ -792,7 +781,7 @@ if (CLANG_ENABLE_BOOTSTRAP)
     COMMAND ${cmake_command} --build <BINARY_DIR> --target install
     COMMENT "Performing install step for '${NEXT_CLANG_STAGE}'"
     DEPENDEES build
-    ${cmake_3_4_USES_TERMINAL}
+    USES_TERMINAL 1
   )
   ExternalProject_Add_StepTargets(${NEXT_CLANG_STAGE} really-install)
   add_custom_target(${NEXT_CLANG_STAGE}-install DEPENDS ${NEXT_CLANG_STAGE}-really-install)
@@ -808,7 +797,7 @@ if (CLANG_ENABLE_BOOTSTRAP)
       COMMAND ${cmake_command} --build <BINARY_DIR> --target ${target}
       COMMENT "Performing ${target} for '${NEXT_CLANG_STAGE}'"
       DEPENDEES configure
-      ${cmake_3_4_USES_TERMINAL}
+      USES_TERMINAL 1
     )
 
     if(target MATCHES "^stage[0-9]*")

runtime/CMakeLists.txt

@@ -34,13 +34,6 @@ if(NOT EXISTS ${COMPILER_RT_SRC_ROOT})
 endif()
 
 if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND EXISTS ${COMPILER_RT_SRC_ROOT}/)
-  if(CMAKE_VERSION VERSION_GREATER 3.3.20150708)
-    set(cmake_3_4_USES_TERMINAL_OPTIONS
-      USES_TERMINAL_CONFIGURE 1
-      USES_TERMINAL_BUILD 1
-      USES_TERMINAL_INSTALL 1
-      )
-  endif()
 
   # Add compiler-rt as an external project.
   set(COMPILER_RT_PREFIX ${CMAKE_BINARY_DIR}/projects/compiler-rt)
@@ -86,7 +79,9 @@ if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND EXISTS ${COMPILER_RT_SRC_ROOT}/)
                ${COMPILER_RT_PASSTHROUGH_VARIABLES}
     INSTALL_COMMAND ""
     STEP_TARGETS configure build
-    ${cmake_3_4_USES_TERMINAL_OPTIONS}
+    USES_TERMINAL_CONFIGURE 1
+    USES_TERMINAL_BUILD 1
+    USES_TERMINAL_INSTALL 1
     )
 
   get_ext_project_build_command(run_clean_compiler_rt clean)