[mc1322x] linking in math libraries?

[Mariano Alvira]

On Thu, Apr 08, 2010 at 12:00:49AM -0700, Andrew Pullin wrote:
> On 4/7/2010 2:37 PM, Mariano Alvira wrote:
>> On Wed, Apr 07, 2010 at 01:05:13PM -0700, Andrew Pullin wrote:
>>    
> Well, that seems to work properly. Would newlib solve this & other  
> problems? 

I just tried my newlib build and it does solve the build issue. The
rftests are 10KB larger though and it looks like printf doesn't work
at all...

> newlib-1.16 seems to build with the OpenEmbedded toolchain if  
> you link arm-elf-* to arm-linux-* , although I don't know where to  
> install it or how to link against it. I'm no compiler expert!

For now you can change the linking line in Makefile.include from
something like:

%_$(BOARD).elf: $(OBJDIR)/%.o $(START) $(ISR) $(SRCOBJS)
$(LINKERSCRIPT) $(LIBMC1322X)/libmc1322x.a $(OBJDIR)/b\
oard.a $(MC1322X)/src/src.a
        $(CC) $(LDFLAGS)  \                                                                                     
        -L $(LIBMC1322X) -L $(MC1322X)/src -L $(OBJDIR) $< -o $@
	$(START) $(MC1322X)/src/src.a --start-group $(OBJDIR)/board.a
$(LIBMC1322X)/libmc1322x.a -lm --end-group

to:

%_$(BOARD).elf: $(OBJDIR)/%.o $(START) $(ISR) $(SRCOBJS)
 $(LINKERSCRIPT) $(LIBMC1322X)/libmc1322x.a $(OBJDIR)/b\
oard.a $(MC1322X)/src/src.a
        $(CC) $(LDFLAGS)  \                                                                                     
        -L $(LIBMC1322X) -L $(MC1322X)/src -L $(OBJDIR) $< -o $@
 $(START) $(MC1322X)/src/src.a -L /home/malvira\
/build-newlib/arm-elf/newlib/ --start-group $(OBJDIR)/board.a
 $(LIBMC1322X)/libmc1322x.a -lm --end-group


where I added a -L to the patch that has libm.a etc.. from newlib.

>
> Along the same lines, is there an accepted way of  building a more  
> minimal toolchain? 

Louis has some scripts over at open-mc13224v. I haven't tried them
though.

There is also a VM for Quahogcon: 

    http://quahogcon.org/contests/
 
    http://quahogcon.org/mc1322x-Dev-VM.torrent

> OE works great, but it seems to be more targeted to  
> linux development; lots and lots and packages to build. 

I only use OE to build the toolchain once, then I add add the cross
tools it builds to my path and such when I need to build mc1322x
stuff. e.g. I source a file that has this:

export PATH=/home/malvira/mc1322x-oe/tmp/cross/armv4t/bin:/home/malvira/build-gdb/gdb:$PATH

> There are  
> instructions at http://www.gnuarm.org/support.html that will results in  
> a compiler that seems to have problems with  
> "-mcallee-super-interworking" when building the libmc1322x tests.

Unfortunately the callee-super-interworking is necessary to use the ROM
calls...

-Mar.