Question

I am currently working on my project wherein I need to program a DSP processor for a modem to do binary FSK modulation. The system was earlier using a QPSK modulation. I have use the same infrastructure, only need to modify the frequency modulation technique. The DSP processor is simulated using a set of C files on a LINUX machine and all the code is tested out on LINUX before moving on to the actual device.

Right now I have just started with the programming and I am just trying to compile my current codeset. I am facing a lot of issues with missing header files.

The device infra files use the header files like:

• filter.h,
• sysreg.h,
• builtins.h

Now I am getting all these headers as “file missing” errors. I was able to fix a couple with

#include <sys/reg.h>
#include <linux/filter.h>

But the builtins.h file is still missing and I am not able to compile the code.

I am using UBUNTU 11.10 and gcc version 4.6.1. Is there some special set of files that I need to update for programming with embedded C. Any help would be much appreciated.

Answer 1

builtins.h is a header that is part of the compiler project and specifies which functions are, literally, built-in to the language, according to the gcc docs.

Your problem is that the compiler you’re using cannot find this file.

You have two options:

1. The first, assuming everything else is set up correctly, is to run find /usr -name "builtins.h" to locate the file and add that directory to the include (-I/path/to/dir) path.
2. If the system uses some form of cross compiler, make sure you’re using that, rather than your host’s gcc. If you aren’t using the correct toolchain, I suspect you’ll have problems linking, too.