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guard policy setting by version checks (#2550)

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* guard policy setting by version checks greater or equal
short explainations of policies being set
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Russel Waters 2020-02-12 09:42:51 -05:00 • committed by GitHub
commit 7a2860bf70
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1 changed files with 8 additions and 2 deletions
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10
CMakeLists.txt
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@ -1,7 +1,13 @@
cmake_minimum_required (VERSION 3.4)
cmake_policy(SET CMP0074 NEW)
cmake_policy(SET CMP0077 NEW)
if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.12")
#find_package uses <PACKAGENAME>_ROOT variables
cmake_policy(SET CMP0074 NEW)
endif()
if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.13")
#option honors normal variables
cmake_policy(SET CMP0077 NEW)
endif()
# compatibility for osx sierra and on
# needs to be set before project
set (CMAKE_OSX_DEPLOYMENT_TARGET 10.12 CACHE STRING "")