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[CMake] Enforce the minimum CMake version to be at least 3.13.4

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This commit changes the warning for CMake < 3.13.4 into a fatal error.
The intent is to revert and re-apply this simple commit until all build
bots are migrated to CMake >= 3.13.4.

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/D78646
This commit is contained in:
Louis Dionne 2020-04-22 11:16:27 -04:00
parent 99ff7e1519
commit d189420bce
1 changed files with 3 additions and 5 deletions
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8
CMakeLists.txt
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@ -3,11 +3,9 @@
cmake_minimum_required(VERSION 3.4.3)
if ("${CMAKE_VERSION}" VERSION_LESS "3.13.4")
message(WARNING
"Your CMake version is ${CMAKE_VERSION}. Starting with LLVM 12.0.0, the "
"minimum version of CMake required to build LLVM will become 3.13.4, and "
"using an older CMake will become an error. Please upgrade your CMake to "
"at least 3.13.4 now to avoid issues in the future!")
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)