Hi, I have a project where I notice that without any changes, when I do a do a second build, there are certain files keep being rebuilt. Only when I do a third build (again without any changes) does Xcode finally recognize nothing needs to rebuild. Are there any debug flags I can turn on to get Xcode tell me what makes it decides to rebuild a file?

I recently updated my xcode to latest version 12.2. According to the doc I should be able to see 64 bit arm selection in the architectures list. But I don't see that. Am I missing something?

I was trying to get my project to work under Xcode 10's new build system but found that it just couldn't handle situation where I have dependency on a project that is setup with "External Build System".With the new build system, we need to specify output files to any shell script build phase if those output files are going to be input to another project. However, the "External Build System" target (ie PBXLegacyTarget) doesn't really allow you to setup build phase and it doesn't have option to let you specify input/output filelist either. So when I have another project that depends on and need to use the external build system output as input to the project, I would just get build error saying the file doesn't exist? Am I missing something?John