Linker "duplicate symbol" warnings

We have been using the same 3rd party static library for years. All of a sudden in the Xcode 11 GM (not previous beta's nor Xcode 10) the ld linker has started throwing out hundreds of "duplicate symbol" messages for this library. They are warnings and not errors. Do anybody know what the issue is or what has changed?

Up vote post of Lbullock Down vote post of Lbullock
3.8k views
Posted by
Lbullock
Reply
Add a Comment

Replies

Same issue.

It seems happening because of the -all_load new forced linker flag.

https://developer.apple.com/documentation/xcode_release_notes/xcode_11_release_notes

Static libraries are now always force-loaded in their entirety during linking, fixing most “unable to demangle” runtime errors. (47598583)

https://www.manpagez.com/man/1/ld/

 -all_load   Loads all members of static archive libraries.
Posted by
Andrea Rizer
Up vote reply of Andrea Rizer Down vote reply of Andrea Rizer
Add a Comment
Same issue.

As @Andrea Rizer mentioned, I removed -all_load from Other Linker flags in Build Settings and the code compiled successfully.
Posted by
Ketan
Up vote reply of Ketan Down vote reply of Ketan
Add a Comment