5.23.2. Reproducing the Error

Because race conditions are intermittent, they do not manifest themselves every time you do the build. In fact, most times the build will complete without problems even though the potential race condition exists. Thus, once the error surfaces, you need a way to reproduce it.

In this example, compiling the "neard" package is causing the problem. So the first thing to do is build "neard" locally. Before you start the build, set the PARALLEL_MAKE variable in your local.conf file to a high number (e.g. "-j 20"). Using a high value for PARALLEL_MAKE increases the chances of the race condition showing up:

     $ bitbake neard
                

Once the local build for "neard" completes, start a devshell build:

     $ bitbake neard -c devshell
                

For information on how to use a devshell, see the "Using a Development Shell" section.

In the devshell, do the following:

     $ make clean
     $ make tools/snep-send.o
                

The devshell commands cause the failure to clearly be visible. In this case, a missing dependency exists for the "neard" Makefile target. Here is some abbreviated, sample output with the missing dependency clearly visible at the end:

     i586-poky-linux-gcc  -m32 -march=i586 ‐‐sysroot=/home/scott-lenovo/......
        .
        .
        .
     tools/snep-send.c
     In file included from tools/snep-send.c:16:0:
     tools/../src/near.h:41:23: fatal error: near/dbus.h: No such file or directory
      #include <near/dbus.h>
                       ^
     compilation terminated.
     make: *** [tools/snep-send.o] Error 1
     $