How to add compiler flags on codeblocks

Because This Question was marked as Duplicate, even if doesn’t have to do with it, because there is about Linker Flag and here is about Compiler Flags, I will post My answer HERE.

You will have to go to Settings -> Compiler… and next you’ll have to click on Linker Settings TAB.

On the right side you will see Other Linker Options.
There you have to type -lpthread and press OK.

You may need to click on rebuild after that.

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