before try_compile with CMP0067 WARN-enabled but no variables after try_compile with CMP0067 WARN-enabled but no variables before try_compile with CMP0067 WARN-default after try_compile with CMP0067 WARN-default before try_compile with CMP0067 WARN-enabled CMake Warning \(dev\) at CMP0067.cmake:[0-9]+ \(try_compile\): Policy CMP0067 is not set: Honor language standard in try_compile\(\) source-file signature. Run "cmake --help-policy CMP0067" for policy details. Use the cmake_policy command to set the policy and suppress this warning. For compatibility with older versions of CMake, try_compile is not honoring language standard variables in the test project: CMAKE_C_STANDARD Call Stack \(most recent call first\): CMakeLists.txt:[0-9]+ \(include\) This warning is for project developers. Use -Wno-dev to suppress it. after try_compile with CMP0067 WARN-enabled CMake Deprecation Warning at CMP0067.cmake:[0-9]+ \(cmake_policy\): The OLD behavior for policy CMP0067 will be removed from a future version of CMake. The cmake-policies\(7\) manual explains that the OLD behaviors of all policies are deprecated and that a policy should be set to OLD only under specific short-term circumstances. Projects should be ported to the NEW behavior and not rely on setting a policy to OLD. Call Stack \(most recent call first\): CMakeLists.txt:[0-9]+ \(include\) + before try_compile with CMP0067 OLD after try_compile with CMP0067 OLD before try_compile with CMP0067 NEW after try_compile with CMP0067 NEW