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Add support for -weak_framework linking on Darwin


From: Sebastian Dröge
Subject: Add support for -weak_framework linking on Darwin
Date: Wed, 22 Oct 2014 13:04:43 +0200

Hi,

please see attached patch to add support for -weak-framework linking on
Darwin. It replicates the logic that is already there for -framework.

-weak_framework allows linking to a Framework without having a strong
dependency on it at runtime. If the Framework is not there at runtime,
all its symbols are going to be NULL.

I'm not sure if the patch is 100% correct, please review. It works for
me in a project which fails to link otherwise as the dependency_libs /
inherited linker flags are not containing the -weak_frameworks but only
the -frameworks.

Best regards,
-- 
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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