iOS library to BitCode

When building static libraries you must add the following for bitcode generation:

-fembed-bitcode 

for a dynamic library you need to additionally link with

-fembed-bitcode

Note: This command is only available with Xcode7+

In regards to the accepted answer of using -fembed-bitcode-marker

You should be aware that a normal build with the -fembed-bitcode-marker option will produce minimal size embedded bitcode sections without any real content. This is done as a way of testing the bitcode-related aspects of your build without slowing down the build process. The actual bitcode content is included when you do an Archive build.

bwilson Apple Staff. https://forums.developer.apple.com/thread/3971#12225

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To be more specific:

• -fembed-bitcode-marker simply marks where the bitcode would be in the binary after an archive build.
• -fembed-bitcode actually does the full bitcode generation and embedding, so this is what you need to use for building static libraries.
• Xcode itself builds with -fembed-bitcode-marker for regular builds (like deploy to simulator)
• Xcode only builds with -fembed-bitcode for archive builds / production builds (as this is only needed for Apple).

Go the Build Settings. Search for "custom compiler flags".
Add -fembed-bitcode to Other C Flags. This will ensure that the lib is built with bitcode compatibility at compile time. I made this for iOS 64 bit and 32 bit, and lipo'd them into one. Works like a charm.

Since you guys had queries, here's a screenshot of the settings: The settings are same for the project target and the SDK target.

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The bitcode lib will not work with Xcode 6.

If you're still having trouble after adding the -fembed-bitcode to the Other C flags, search for "Enable Bitcode" under "Build Options" and set it to No. This will allow you to archive properly.