Nimble: Compiling fails in Xcode 9 / Swift 4 / Nimble 7.0.2

[Blackjacx]

What did you do?

Compile Nimble in Xcode 9 9A235

What did you expect to happen?

It Compiles

What actually happened instead?

It gives me the compilation error:

CwlPreconditionTesting/CwlPreconditionTesting/CwlCatchBadInstruction.swift:82:11: Overlapping accesses to 'self', but modification requires exclusive access; consider copying to a local variable

Environment

List the software versions you're using:

• Quick: 1.1.0
• Nimble: 7.0.2
• Xcode Version: 9.0 (9A235)
• Swift Version: 4.0

Please also mention which package manager you used and its version. Delete the
other package managers in this list:

• Cocoapods: 1.3.1

Project that demonstrates the issue

https://github.com/Blackjacx/SHSearchBar

[ikesyo]

CI builds are passing and I can't reproduce it locally. Could you try a clean build or removing ~/Library/Developer/Xcode/DerivedData?

[Blackjacx]

I've already cleaned everything. The CI builds of 4 of my projects are not passing and show the same errors:

The error message overlapping accesses to 'self', but modification requires exclusive access; consider copying to a local variable is a Swift 4 warning that is enabled in Xcode 9 by default.

You can try to compile the following projects:

• https://github.com/Blackjacx/SHSearchBar - scheme SHSearchBar
• https://github.com/Blackjacx/SHDateFormatter - scheme SHDateFormatter
• https://github.com/Blackjacx/Source - scheme Source

EDIT:
I found out that this happens when I build my framework target with the Thread Sanitizer enabled. When I switch it off I can build without errors locally. My CI machine still delivers me that error. Maybe it uses this thread sanitizer despite I disabled it in my scheme settings...

I only found this issue of another project with an related failure: https://github.com/algolia/algoliasearch-client-swift/issues/388

[Blackjacx]

OK fixed this issue for me by disabling thread sanitizer... But it is still an issue for people with thread sanitizer enabled.

You can

1. clone the project https://github.com/Blackjacx/SHSearchBar
2. enable thread sanitizer for run and test phase
3. build SHSearchBar scheme

to reproduce the failure.

[ikesyo]

Thanks for the investigation @Blackjacx! That's really helpful.

[Blackjacx]

I like the project and use it a lot :-)

[mackoj]

I have this issue and I don't have Thread Sanitizer enable on Xcode 9.2

/Users/jmacko/pj/iOS-app/Pods/Target Support Files/Nimble/Nimble-umbrella.h:13:9: note: in file included from /Users/jmacko/pj/iOS-app/Pods/Target Support Files/Nimble/Nimble-umbrella.h:13:
#import "Nimble.h"
        ^
/Users/jmacko/pj/iOS-app/Pods/Nimble/Sources/Nimble/Nimble.h:9:13: error: 'CwlPreconditionTesting.h' file not found
    #import "CwlPreconditionTesting.h"
            ^
<unknown>:0: error: could not build Objective-C module 'Nimble'

Testing failed:
    'CwlPreconditionTesting.h' file not found
    Could not build Objective-C module 'Nimble'
** TEST FAILED **

[saragiotto]

pod deintegrate
pod install

Work for me just now.