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I have been wrestling with problem #3 for almost a week. I believe it was precipitated by modifying the help book for a macOS project, which I was trying to commit before upgrading to Xcode 11 from Xcode 10.I initially searched "Command codesign failed with a non-zero exit code". None of the solutions resolved my problem. Despite seemingly endless frustration, I continued to explore the Xcode app and my macOS project. On a whim, I decided to search the "new build system", and I came across the link cited in #3 as well as Apple's own documentation. However, the solutions did not correct my build failure.Out of desparation, I considered reverting to the legacy build system when I had an inspiration. I reverted to the legacy build system in "File -> Project Settings ...". Instead or using the legacy build system to rebuild my project, I cleaned the project with the legacy build system. Then I changed back to the new build system and issued the build command. It succeeded without a codesign failure.