Xcode build too slow especially 'Merge swift module (x86_64)

Question

Created May ’21

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Hi
I tried to build my application with Xcode 12.

I have struggled with a bad problem which is very very slow to build or index to my app.

I looked the 'show the report navigator' tab and build messages and I find

Code Block Compile swift source files(x86_64) 300.3 seconds
Precompiling bridging header (x86_64)
Compile AAA.swift (x86_64)
Merge swiftmodule (x86_64)

the 'Merge swiftmodule' process is especially slow.
There are any document or tips I can fix it ?

Please let me know how to improve and why it occur.
thanks.

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Answer 1

Claude31 OP

May ’21

I would first do an option-Clean Build Folder and see what happens.

Could you tell what is the longest task reported in the log (could you copy the complete log ?)

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