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build: enable CMake policy 0077

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Enable CMake policy 77. This alters the behavior of option. The old behavior
would remove the value of the option from the cache and create a new one. The
new behavior does not create the variable if it is defined already. This ensures
that subsequent reconfigures will behave identically. This seems better than the
setting of OLD - the desire is to ensure that it is set to OLD or NEW.

llvm-svn: 361307
This commit is contained in:
Saleem Abdulrasool 2019-05-21 20:28:32 +00:00
parent 3418dc6e7b
commit 194593f243
1 changed files with 4 additions and 0 deletions
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4
CMakeLists.txt
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@ -11,6 +11,10 @@ if(POLICY CMP0075)
cmake_policy(SET CMP0075 NEW)
endif()
if(POLICY CMP0077)
cmake_policy(SET CMP0077 NEW)
endif()
if(NOT DEFINED LLVM_VERSION_MAJOR)
set(LLVM_VERSION_MAJOR 9)
endif()