iOS library to BitCode

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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

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).

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