Xcode 9.4.1 Could not build module and redefinition of module - Can't Build

Question

Encountering this issue in Xcode, solutions I've tried:

• Enabled modules to YES and NO
• Reinstalled Xcode 9.4.1 by deleting 9.4.1 and ~/Library/Developer
• Downgraded command lines tools to 9.4.1
• Downgraded Cocoapods to 1.4.0 from 1.5.3

I'm at a loss at this point can someone point me to the right direction here? I've already spent an entire day on this. Other projects build fine though.

Answer 1

Error: redefinition of module

I got redefinition of module when was working on own framework and added a first .m file (as a part of Cocoa Touch Class) and created module.modulemap file. Please note that this error is shown even if you do not add a path into Module Map File

To solve this issue I just renamed a module.modulemap to ModuleName.modulemap

Answer 2

Try removing Command-line tools and build your project

sudo rm -rf /Library/Developer/CommandLineTools 

To Reinstall:

xcode-select --install

Answer 3

I SOLVED IT!

XCode was adding the following Header Search Paths:

/usr/include/libxml2 recursive
/usr/include/libxml2 non-recursive

But libxml2 is already included in the SDK from XCode.app via $(inherited) search path so everything was conflicting.

Removed those two /usr/include/libxml2 paths at the top of my folder hierarchy fixed it!

Thank the XCode gods.