hello_world_c

[Joel Sherrill]

angelo wrote:
> 
> I have come upon some problems with the hello_world dated
> By making hello_world from the hello_world_c directory I get the
> following error massage.
> 
> In file included from test.c:35:
> /opt/rtems/pc586/lib/include/confdefs.h:1005: #error "CONFIGURATION
> ERROR: No tasks or threads configured!!
> #endif
> 
> /*
>  *  Make sure at least one of the initialization task/thread
>  *  tables was defined.
>  */
> 
> #if !defined(CONFIGURE_RTEMS_INIT_TASKS_TABLE) &&
> !defined(CONFIGURE_POSIX_INIT_THREAD_TABLE) &&
> !defined(CONFIGURE_ITRON_INIT_TASK_TABLE)
> #error "CONFIGURATION ERROR: No initialization tasks or threads
> configured!!
> make: *** [o-optimize/test.o] Error 1
> 
> Upon looking at test.c (in hello_world_c) we can see that
> CONFIGURE_RTEMS_INIT_TASKS_TABLE is actually defined, so I investigated
> the file /opt/rtems/pc586/lib/include/confdefs.h and we see the
> following:
> 
> #if (CONFIGURE_MAXIMUM_TASKS == 0) && \
>     (CONFIGURE_MAXIMUM_POSIX_THREADS == 0) && \
>     (CONFIGURE_MAXIMUM_ADA_TASKS == 0) &&  \
>     (CONFIGURE_MAXIMUM_ITRON_TASKS == 0)
> #error "CONFIGURATION ERROR: No tasks or threads configured!!
> #endif
> 
> /*
>  *  Make sure at least one of the initialization task/thread
>  *  tables was defined.
>  */
> 
> #if !defined(CONFIGURE_RTEMS_INIT_TASKS_TABLE) && \
>     !defined(CONFIGURE_POSIX_INIT_THREAD_TABLE) && \
>     !defined(CONFIGURE_ITRON_INIT_TASK_TABLE)
> #error "CONFIGURATION ERROR: No initialization tasks or threads
> configured!!
> #endif
> 
> The error has been caused by the following conditional statement:
> #if (CONFIGURE_MAXIMUM_TASKS == 0) && \
>     (CONFIGURE_MAXIMUM_POSIX_THREADS == 0) && \
>     (CONFIGURE_MAXIMUM_ADA_TASKS == 0) &&  \
>     (CONFIGURE_MAXIMUM_ITRON_TASKS == 0)
> 
> however, the #error statement below this one and the conditional
> statement after it do not end in a ".   Is this correct? I believe they
> should both be terminated with a ".
> 
> Back to the original problem however, This does not solve the problem as
> to why the hello_world_c did not make.  This overcome by adding
> #define CONFIGURE_MAXIMUM_TASKS 1
>  to test.c (in hello_world_c) and this allowed the program to build and
> generate an executable as o-optimize/test.exe.
> 
> The two issues I am addressing in this long winded message are:
> 
> 1. Should the two #error statements in
> /opt/rtems/pc586/lib/include/confdefs.h be terminated with a " ?, and

Yes.

> 2. Should I have to include the CONFIGURE_MAXIMUM_TASKS 1 in test.c?

Yes.

> PS.
> Just for a side issue, is it good programming practice to have #include
> statements at the bottom of source modules (test.c)?

In this case, it is.  this include is instantiating the configuration.

> --
> Angelo Fraietta
> 
> PO Box 859
> Hamilton NSW 2303
> 
> Home Page
> 
> http://users.hunterlink.net.au/~maaaf/
> 
> There are those who seek knowledge for the sake of knowledge - that is
> CURIOSITY
> There are those who seek knowledge to be known by others - that is
> VANITY
> There are those who seek knowledge in order to serve - that is LOVE
>     Bernard of Clairvaux (1090 - 1153)

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
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