Additional flags to be added when compiling this source file.
The COMPILE_FLAGS property, managed as a string, sets additional compiler flags used to build source files. Use COMPILE_DEFINITIONS to pass additional preprocessor definitions.
Contents of COMPILE_FLAGS may use “generator expressions” with the syntax $<...>. See the cmake-generator-expressions(7) manual for available expressions. However, Xcode does not support per-config per-source settings, so expressions that depend on the build configuration are not allowed with that generator.
Note
This property has been superseded by the COMPILE_OPTIONS property.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/prop_sf/COMPILE_FLAGS.html