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-rw-r--r--flang/CMakeLists.txt9
-rw-r--r--flang/lib/Decimal/CMakeLists.txt2
-rw-r--r--flang/runtime/CMakeLists.txt9
3 files changed, 17 insertions, 3 deletions
diff --git a/flang/CMakeLists.txt b/flang/CMakeLists.txt
index 4c0b9a84cc5b..e47456a0fb93 100644
--- a/flang/CMakeLists.txt
+++ b/flang/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.20.0)
+cmake_minimum_required(VERSION 3.13.4)
if(NOT DEFINED LLVM_COMMON_CMAKE_UTILS)
set(LLVM_COMMON_CMAKE_UTILS ${CMAKE_CURRENT_SOURCE_DIR}/../cmake)
@@ -39,6 +39,13 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
message("Building Flang as a standalone project.")
project(Flang)
set(FLANG_STANDALONE_BUILD ON)
+ if ("${CMAKE_VERSION}" VERSION_LESS "3.20.0")
+ message(WARNING
+ "Your CMake version is ${CMAKE_VERSION}. Starting with LLVM 17.0.0, the "
+ "minimum version of CMake required to build LLVM will become 3.20.0, and "
+ "using an older CMake will become an error. Please upgrade your CMake to "
+ "at least 3.20.0 now to avoid issues in the future!")
+ endif()
else()
set(FLANG_STANDALONE_BUILD OFF)
endif()
diff --git a/flang/lib/Decimal/CMakeLists.txt b/flang/lib/Decimal/CMakeLists.txt
index 3116ff68ea26..a81d329b4a5d 100644
--- a/flang/lib/Decimal/CMakeLists.txt
+++ b/flang/lib/Decimal/CMakeLists.txt
@@ -1,5 +1,5 @@
if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
- cmake_minimum_required(VERSION 3.20.0)
+ cmake_minimum_required(VERSION 3.13.4)
project(FortranDecimal C CXX)
diff --git a/flang/runtime/CMakeLists.txt b/flang/runtime/CMakeLists.txt
index 63d7f9bf2a9d..2a7e74c17553 100644
--- a/flang/runtime/CMakeLists.txt
+++ b/flang/runtime/CMakeLists.txt
@@ -7,7 +7,14 @@
#===------------------------------------------------------------------------===#
if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
- cmake_minimum_required(VERSION 3.20.0)
+ cmake_minimum_required(VERSION 3.13.4)
+ if ("${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()
project(FlangRuntime C CXX)