Adding a custom library to l4/pkg/bootstrap

Masti Ramya Jayaram rmasti at inf.ethz.ch
Tue Sep 2 13:32:16 CEST 2014


Sorry about the multiple emails. I managed to get past the library not found error - it was a matter of nomenclature.  

However, now I am trying to call a function in the library through an included header file (which is part of the library) and it fails  (undefined reference).

My header file: init.h

#define BLAH 10
int abcd = 5;
int hello();

Code in my init.c

int hello(){
printf("Hello");
}

My C++ code:

extern "C"{
#include <l4/libscc-sec/init.h>
}

int main(){
printf("Vars from lib %x, %x", BLAH. abcd)
hello();
}

The program fails to compile with the calls to the function hello. If I remove hello, it compiles.

I made sure that I am indeed using the extern "C" directive. I also tried putting the function declaration in here instead of the header file itself but it does not help.

Thanks,
ramya
________________________________________
From: l4-hackers [l4-hackers-bounces at os.inf.tu-dresden.de] on behalf of Masti  Ramya Jayaram [rmasti at inf.ethz.ch]
Sent: 02 September 2014 11:37
To: l4-hackers at os.inf.tu-dresden.de
Subject: Adding a custom library to l4/pkg/bootstrap

Hi all,

I have managed to compile a custom C library (libscc-sec) as part of the l4 packages. Now I would like to use it in the bootstrap package (make a call to a function in the library). I did the following:

a. Added the library as a requirement in pkg/bootstrap/Control

requires: drivers_uart drivers_of libc l4util cxx_io libscc-sec

b. Modified the pkg/bootstrap/server/src/Make.rules so that it also looks for libscc-sec by:

L4_LIBS          = -static -nostdlib $(DRV_LIBS) -lcxx_base -lcxx_io -llibscc-sec

But on compiling, I get an error that says that -llibscc-sec not found

The package is getting compiled and I can see the library libscc-sec.a in the build folder. What am I missing?

Thanks,
ramya


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