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Re: [avr-libc-dev] Missing and unfindable run time objects

From: Dennis W. Tokarski
Subject: Re: [avr-libc-dev] Missing and unfindable run time objects
Date: Wed, 25 Feb 2009 16:55:33 -0500
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Joerg Wunsch wrote:
> As Dennis W. Tokarski wrote:
>> /usr/lib/gcc/avr/4.3.3/../../../../avr/bin/ld: crtm1280.o: No such file: No 
>> such file or directory
>> /usr/lib/gcc/avr/4.3.3/../../../../avr/bin/ld: crtm1281.o: No such file: No 
>> such file or directory
>> /usr/lib/gcc/avr/4.3.3/../../../../avr/bin/ld: crtm128.o: No such file: No 
>> such file or directory
>> The files are definitely there, with 644 perms and owned
>> by root, just like all the others which work.
> Add a -v to the compiler options, and it will tell you the exact
> linker command line it's using.  That should indicate where it is
> searching for these files.

In the case of atmega128, the ld command turns out to be:
/usr/lib/gcc/avr/4.3.3/../../../../avr/bin/ld -m avr5 -Tdata 0x800100 -o hello 
crtm128.o -L/usr/lib/gcc/avr/4.3.3/avr51 -L/usr/lib/gcc/avr/4.3.3 
-L/usr/lib/gcc/avr/4.3.3/../../../../avr/lib /tmp/ccgfnUbS.o -lgcc -lc -lgcc
wherease for the atmega169 it is:
/usr/lib/gcc/avr/4.3.3/../../../../avr/bin/ld -m avr5 -Tdata 0x800100 -o hello 
-L/usr/lib/gcc/avr/4.3.3/avr5 -L/usr/lib/gcc/avr/4.3.3/../../../../avr/lib/avr5 
- -L/usr/lib/gcc/avr/4.3.3/../../../../avr/lib /tmp/ccs4Urlf.o -lgcc -lc -lgcc

So...it's looking for the run time object in the current
directory because the directory path isn't prepended. It
also doesn't include /usr/avr/lib/avr5 as a library
directory as the atmega169 case does. Odd.

>> I don't know if this is an avr-gcc/binutils problem or
>> an avr-libc problem.
> It's somehow a problem with that particular toolchain build, albeit I
> don't have the faintest idea /what/ went wrong.  Hmm, one idea just
> comes to mind: the compiler and library disagree about whether these
> MCU types belong into either of "avr5" or "avr51" categories.  IMHO,
> this can only happen if the library is built using a different
> compiler than the compiler you've installed.

It looks like you might be right about that avr5/51 disagreement.

> For an up-to-date Linux toolchain with a decent patchlevel, I'd
> recommend using Bingo600's Linux build script:
> http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=42631

I'll look at that. I'm also wondering if it might
be worth rebuilding the library package against my installed
compiler. Maybe I'll try that too.

Thanks, Joerg.

- --Dennis

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