Build Instructions for PJLIB/PJMEDIA/PJSIP RTEMS Port



The RTEMS port uses the POSIX abstraction layer at the moment, and has been 
tested with RTEMS 4.6 on i386 target.


Building RTEMS
---------------
I use RTEMS 4.6 on a cygwin host with i386/pc386 as target, but I think it 
should work with different RTEMS versions/hosts/targets. 

RTEMS was built with the following commands:

  $ /opt/src/rtems-4.6.6/configure --enable-cxx --enable-posix --enable-networking --enable-rdbg --enable-tests --enable-rtemsbsp=pc386 --target=i386-rtems
  $ make
  $ make install


Supported Targets
-----------------
At the moment, pjlib supports i386 and mpc860 CPU target. For other targets, 
you would need to create/tweak the appropriate "m-xxx.mak" in "build" directory
and the corresponding "m_xxx.h" header file in "pj/compat" directory.

Please refer to pjlib porting guide about how to port PJLIB to new CPU target.


Building PJLIB/PJMEDIA/PJSIP
----------------------------
Use the following steps to build the libraries:


1. Set RTEMS_LIBRARY_PATH environment variable to point to your BSP directory 
   (which is <RTEMS INSTALLATION POINT>/<BOARD SUPPORT PACKAGE>). 

   For example (with sh):
 
   $ export RTEMS_LIBRARY_PATH=/opt/rtems-4.6/i386-rtems/pc386


2. Unfortunately pjproject's configure script is unable to create "build.mak" 
   for cross compilation (but this may change in the future), so we need to 
   create "build.mak" manually.

   The file "README-configure" has some info about the variables in "build.mak".

   For example, the "build.mak" for i386 target:

   export MACHINE_NAME := i386
   export OS_NAME := rtems
   export HOST_NAME := mingw
   export CC_NAME := gcc
   export TARGET_NAME := i386-rtems
   export CROSS_COMPILE := i386-rtems-


3. Put additional CFLAGS or LDFLAGS that are specific to your target in 
   "user.mak".

   For example, my "user.mak" looks like this:

   export CFLAGS += 
   export LDFLAGS += -Wl,-Ttext,0x00100000 -Wl,--defsym -Wl,HeapSize=0x400000


4. Build the libraries:

   $ make dep && make distclean && make


5. That should be it. The libraries should be in "lib" directory and 
   applications in "bin" directory.



Acknowledgements
----------------
Many thanks for Phil Torre <ptorre at zetron dot com>, who did most of the 
initial porting and testing with pjlib etc. All credits go to him.