COMPILE_FLAGS
Additional flags to use when compiling this target’s sources.
The COMPILE_FLAGS property sets additional compiler flags used to build sources within the target. Use COMPILE_DEFINITIONS to pass additional preprocessor definitions.
This property is deprecated. Use the COMPILE_OPTIONS property or the target_compile_options command instead.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/prop_tgt/COMPILE_FLAGS.html