Building for Linux

[Joel Sherrill]

On Tue, 5 May 1998, Dominic Hanlan VH370 3375 wrote:

> Hi,
> 
> I have just started with RTEMS and have downloaded all the 4.0.0-beta3
> files.
> 
> egcs-1.0.2
> binutils-2.8.1
> gas-980314
> newlib-1.8.0
> bit
> 
> plus patches

These are only used for cross builds -- not the native unix ones.  These
use the native toolset.

> I would like to build the system to run for evaluation on Linux ( intel
> ) but seem to be having no luck so far.

I think linux was broken in that beta.   We cleaned up some configuration
and stuff broke.  Try this to verify:


mkdir build
cd build
../rtems-4.0.0-beta3/configure
gmake
cd posix/tests
./hello.exe

That is the basic procedure.  I will be out of the office today so can't
check that.  I am answering from home.

> Having applied all patches and set the INSTALL_POINT in bit, which CPU
> should I choose? I have tried i386 and this successfully builds the
> complete tools chain.

Sorry.  bit is only for building a cross toolset.  

Where in the documentation would this point have helped?  Obviously this
point was neglected somewhere.

> The f.c compiles fine and all the paths are correct in verbose mode.
> 
> The INSTALL_POINT is /usr/local/rtems/egcs-1.0.2/i386-rtems/

i386-rtems targets an embedded ix86 CPU running RTEMS.  It is an embedded
configuration -- not a unix hosted one.

> Now moving to rtems itself. I hane tried the following configuration
> 
> ../rtems-4.0.0-beta3/configure --enable-gcc28 --disable-ka9q \
> --prefix=/usr/local/rtems/egcs-1.0.2/i386-rtems/

> /usr/lib/libm.a /usr/lib/libc.a
> /usr/lib/libc.a: could not read symbols: File format not recognized

Exactly linux is elf and you just build a coff based embedded corss
toolset.

> why is it trying to use /usr/lib/libc.a ? Do they not come from
> newlib-1.8.0 ?

you are configuring for a non-unix embedded i386.

> So for anyone out there who has built a Linux hosted system, could you
> pass on your pearls of wisdom as to how you got your system working. How
> does the tools chain get matched up with the building of RTEMS.



--joel