commit 7fee2667618e7636d4a7dfdc314ca4fdd9305851
author Mark de Wever <koraq@xs4all.nl> Sat May 06 16:53:15 2023 +0200
committer Copybara-Service <copybara-worker@google.com> Sat May 06 08:06:21 2023 -0700
tree f85d14dc4bff818fdfd59bff90202ee477041f9c
parent d2bf6e48dc03d1916b911722321c438ad274575c

Revert "Reland "[CMake] Bumps minimum version to 3.20.0.""

Unfortunatly not all buildbots are updated.

This reverts commit ffb807ab5375b3f78df198dc5d4302b3b552242f.

GitOrigin-RevId: e8e8707b4aa6e4cc04c0cffb2de01d2de71165fc

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d0f2cd..536f11f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,14 @@
 # Check if this is a in tree build.
 if (NOT DEFINED LLVM_MAIN_SRC_DIR)
   project(Polly)
-  cmake_minimum_required(VERSION 3.20.0)
+  cmake_minimum_required(VERSION 3.13.4)
+  if ("${CMAKE_VERSION}" VERSION_LESS "3.20.0")
+    message(WARNING
+      "Your CMake version is ${CMAKE_VERSION}. Starting with LLVM 17.0.0, the "
+      "minimum version of CMake required to build LLVM will become 3.20.0, and "
+      "using an older CMake will become an error. Please upgrade your CMake to "
+      "at least 3.20.0 now to avoid issues in the future!")
+  endif()
   set(POLLY_STANDALONE_BUILD TRUE)
 endif()