[PATCH] D83995: Provide some instructions to guide the user on how to get a more up-to-date CMake in CMake error message

[Mehdi AMINI via Phabricator via llvm-commits]

mehdi_amini created this revision.
Herald added subscribers: llvm-commits, mgorny.
Herald added a project: LLVM.

Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D83995

Files:
  llvm/CMakeLists.txt


Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -3,9 +3,19 @@
 cmake_minimum_required(VERSION 3.4.3)
 
 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.")
+  set(ERROR_MSG " Your CMake version is ${CMAKE_VERSION}. The minimum version of CMake "
+    " required to build LLVM is now 3.13.4.\n\n"
+    " You can download CMake from: https://github.com/Kitware/CMake/releases")
+  if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
+     string(APPEND ERROR_MSG "\n"
+      " or can locally get cmake in the current build directory:\n"
+      " $ wget https://github.com/Kitware/CMake/releases/download/v3.18.0/cmake-3.18.0-Linux-x86_64.tar.gz\n"
+      " $ echo \"4d9a9d3351161073a67e49366d701b6fa4b0343781982dc5eef08a02a750d403  cmake-3.18.0-Linux-x86_64.tar.gz\" | sha256sum -c\n"
+      " $ tar -xf cmake-3.18.0-Linux-x86_64.tar.gz && (cd cmake-3.18.0-Linux-x86_64 && ./bootstrap && make)\n"
+      " # Done, cmake is usable, nothing is installed on the system, everything is self-contained *inside* the build directory itself.\n"
+      " $ ./cmake-3.18.0-Linux-x86_64/bin/cmake ../llvm/ -D.... # build LLVM as usual.")
+  endif()
+  message(FATAL_ERROR ${ERROR_MSG})
 endif()
 
 if(POLICY CMP0068)


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