Coder linking error with multiple C dependencies

With Coder, I'm trying to compile a function matlab_code.m. It depends on an external C-file, c_code1.c. c_code1.c must be built with another exernal C-file c_code2.c, which depends on -lmylib. So it looks like this:

matlab_code.m

|

c_code1.c ---- c_code2.c

|

-lmylib

All of the individual C object files seem to be built fine because I see output like this after running my build script:

gcc -c -std=c99 ... -I/usr/local/include -L/usr/local/lib -lmylib ... -o "c_code1.o" "/home/file/path/c_code1.c"

gcc -c -std=c99 ... -I/usr/local/include -L/usr/local/lib -lmylib ... -o "c_code2.o" "/home/file/path/c_code2.c"

### Creating standalone executable /home/file/path/matlab_code ...

g++ ... -o /home/file/path/matlab_code ... c_code1.o ... c_code2.o -lm

c_code2.o: In function `function_from_c_code2':

c_code2.c:(.text+0x9d): undefined reference to `function_from_mylib'

So it looks like c_code2.o isn't linked against mylib. Any hints on how I can fix this?

Testing stuff outside of Matlab, some example code that depends on c_code2.c is compiled like this:

gcc simple_c_example.c c_code2.c -o simple_c_example -I/usr/local/include -L/usr/local/lib -lmylib

^ This gcc call works great, but I need to do something similar in Matlab.

Some stuff I have tried in the build script:

coder.updateBuildInfo('addCompileFlags','-I/usr/local/include -L/usr/local/lib -lmylib');

coder.updateBuildInfo('addIncludePaths', '/usr/local/include');

coder.updateBuildInfo('addLinkObjects','libmylib.so','/usr/local/lib')

Answer 1

[Andy Zelenak]

I needed to add the library to the codegen command in my build script:

codegen -config cfg ... /usr/local/lib/mylib.so