Allow old CMake versions without IPO support #20
Merged
+9
−3
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Both the policy
CMP0069
and the functioncheck_ipo_supported
were only added in CMake version 3.9. Not setting the policy for versions < 3.9 would add support for such versions. Additionally, setting the default forUSE_LTO
toOFF
in such cases makes it work without the user having to disable it manually.