Fix SPM instructions for excluding FLEX from release builds

[robinkunde]

No description provided.

[NSExceptional]

This seems like it would narrow the scope of what gets excluded. Is only one object file created? I thought each file got its own object file. Or are those instructions unique to SPM or something?

[robinkunde]

Yes, this is unique to SPM. Build settings are not passed through to packages, so it has no impact there. If you use FLEX* and check the build log or Build/Intermediates.noindex/FLEX.build in the derived data folder, you will see that all the source files still get compiled. Each SPM target/product in turn produces a single, consolidated object file.
The reason this works at all is because Excluded Source File Names is also passed to the linker which also treats it as an exclusion list of input files. So when the project is linked at the very end, the FLEX.o file is simply skipped.