Xcode 10 (10A255) Error: <unknown>:0: error: duplicate input file

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Not sure if this is a known Xcode 10 bug or something particular about my project. It compiles fine using Xcode 9.4.1 but when I try to compile the MacOS target project, I get a very vague error message:

<unknown>:0: error: duplicate input file 'WatchKit'
<unknown>:0: error: duplicate input file 'Extension'
<unknown>:0: error: duplicate input file 'Extension'
<unknown>:0: error: duplicate input file 'Tab'
<unknown>:0: error: duplicate input file 'Tab'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Files/Pods-My_WatchOS'
<unknown>:0: error: duplicate input file 'Extension'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Files/Pods-My_iOS'
<unknown>:0: error: duplicate input file 'Tests'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Support'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: duplicate input file 'Tests.build'
<unknown>:0: error: duplicate input file 'Extension.build'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: duplicate input file 'Example'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: duplicate input file 'Home'
<unknown>:0: error: if any output files are specified, they all must be
Command CompileSwift failed with a nonzero exit code

I've opened up a bug at Apple, but wanted to see if anyone else is having the same issue and if they figured out how to fix.

xcode10 xcode macos ios
1 Answers

Your project folder contains directories with space in name e.g. "Hello World". You should rename all founded directories (even without source code) into name without spaces, e.g. "HelloWorld" or "Hello-World".

<unknown>:0: error: duplicate input file 'Tests.build'
<unknown>:0: error: duplicate input file 'Extension.build'
<unknown>:0: error: duplicate input file 'Home'

'Tests.build', 'Extension.build', 'Home' are part of name after space. So, with this hack you can solve all errors, except last issue:

"<unknown>:0: error: if any output files are specified, they all must be"

But anyway, I didn't a find solution for last error.

UPDATE:

Last error fixed by removing spaces in Product Name in Build Settings for your target (don't confuse with Display Name in Info.plist, it can contain spaces)

user_103991920
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