RE: Macraigor GNU C for MPC500

Can't remember the exact differences of the below listed switches.  I do
remember that I had to build the needed libraries.  I choose "Newlib".
Check out the home page for newlib:
http://sourceware.org/newlib/

You can find instructions on building the newlib libraries for the powerpc
by doing google searches, but hopefully someone just has the pre-built
libraries for easy download.  Otherwise you have to use your powerpc-gcc
compiler to build them (not that much fun if you've never done it before).

Hope that helps,
Dan


-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of
David Eicher
Sent: Monday, July 18, 2005 7:06 AM
To: [email protected]
Subject: RE: [MPC500] Macraigor GNU C for MPC500


I did discover that in the GNU online docs it mentions several options and
gives standard library names for each:



-msim   standard libs are libsim.a and libc.a

-mmvme - libmvme.a and libc.a

-mads - libads.a and libc.a

-myellowknife - libyk.a and libc.a



Does anyone know the difference between these, or a place where that
difference might be documented?



I did find that libc.a supports the use of sprintf(  ) , but not printf.
That will do just fine if I can't find printf. This makes sense for an
embedded environment, sprintf builds a string, then I just need to transmit
the string using my SCI send routines. That cures the problem of figuring
out how to configure stdout/stdin to use SCI.



Regards,



Dave





  _____

From: [email protected] [mailto:[email protected]] On Behalf Of
David Eicher
Sent: Sunday, July 17, 2005 9:02 AM
To: [email protected]
Subject: [MPC500] Macraigor GNU C for MPC500



Hello,



I using the subject development tools, and can't seem to find the libraries
I'm suppose to use for stdio (printf, etc.). Does anyone know what directory
Macraigor puts them in?



Dan showed me how to point ld.exe to the libraries, if I can just figure out
where they are.



Thanks,



Dave





  _____

From: [email protected] [mailto:[email protected]] On Behalf Of
Dan Fowell
Sent: Thursday, July 14, 2005 7:34 AM
To: [email protected]
Subject: RE: [MPC500] Using libraries with GNU C for MPC555



I don't use stdio or printf, but I do link in a library called libc.a (which
has sprintf, atoi, and many others).  My link command looks as follows:
powerpc-elf-ld.exe -g -t --verbose -Trom.lnk -o main.elf startup.o serial.o
main.o hdw.o -L../lib -lc

It's been a few years, but I think the -L tells it to link in the libraries,
I specify the location of the library "../lib" and then I specify which
library "-lc" which tells it to link in the c library (there is a libm.a and
a libg.a as well).  So from where I compile, my libc.a file is back a
directory and then in a "lib" folder I created.
Hope that helps.

Dan


-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of
David Eicher
Sent: Thursday, July 14, 2005 8:08 AM
To: [email protected]
Subject: [MPC500] Using libraries with GNU C for MPC555


Hello,



Does anyone have any experience with the linker in the subject environment?
I am having trouble getting ld to find the libraries GNU C is suppose to be
using for Stdio. I can't figure out how to set the path so the linker will
find the library, and I haven't been able to figure out what the name of the
library is that I need to resolve a reference to printf( ).



Thanks for any insight you might be able to offer.



Dave





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