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Compiling c files with the Unreal Build System

Hi, I have an external lib that I would like to include as source in a plugin I'm making. The lib is written in straight c and I had a few issues getting the Unreal Build System to compile the module that I'm reporting here as potential bug reports or for people to find via search:

1) the MODULENAME_API macro does not seem to work with c files (it does not seem to replace the export / import correctly).

2) because of this you need to wrap exposed functionality in a cpp file to expose something or the .exp file will not be produced and the module compilation will fail

hope this helps someone!

Product Version: UE 4.16
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asked Jul 18 '17 at 11:30 AM in Bug Reports

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Hi Structure,

Sorry for not responding to your post sooner. Are you still having trouble with this?

The MODULENAME_API macro should work for both C and C++. However, since our module system was created using C++, the macro was never really intended to link to a C library.

What is most likely happening here is that your C library is being correctly included as a dependency, so the macro is set to import. However, because it is a C library, our build system never actually builds the library and the macro is never set to export. That is probably why wrapping your library's functionality with C++ and using the macro there works fine.


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answered Feb 28 '18 at 07:09 PM

avatar image Structure Mar 26 '18 at 11:20 AM

Hi Tim, thanks for the reply. Our C++ wrapper is doing what we need for now. But maybe this something to put into the backlog to make a test case out of compiling a straight c lib in the future.


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