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Forum: ARM programming with GCC/GNU tools Libraries


Author: Harold Ritter (hlritter)
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Hi all,

I have installed Yagarto and imported the sam7s blinky project supplied
by Atmel for the 7S-EK board. I have successfully compiled downloaded
and run the code and am able to use all debug functions.

My question is:

The Atmel demo project supplied its own libraries "libc.a, libgcc.a and
libm.a" does anybody know where these libraries come from? Can anybody
tell me how to use Newlib with Yagarto. I dont want to have to compile
it myself. Is the newlib library available already compiled for arm?
Does Yagarto come with Newlib?

Thanks!
Harold

Author: Martin Thomas (mthomas) (Moderator)
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> The Atmel demo project supplied its own libraries "libc.a, libgcc.a and
> libm.a" does anybody know where these libraries come from?
I did not notice this. Could you please give the URL from where you have
downloaded the demo?

> Can anybody
> tell me how to use Newlib with Yagarto. I dont want to have to compile
> it myself. Is the newlib library available already compiled for arm?
> Does Yagarto come with Newlib?
http://www.yagarto.de/ : ...Newlib-1.16.0...

Author: Harold Ritter (hlritter)
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> I did not notice this. Could you please give the URL from where you have
> downloaded the demo?

I downloaded so much stuf that I cant remember where I got it from but
the project is called demo_at91sam7_blink_flash and it is authored by
James P Lynch.

I included the lib files I mentioned.

Author: Harold Ritter (hlritter)
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Thanks Martin,

So how in the makefile do I tell the linker to use Yagarto's newlib? I
have searched the yagarto directory and have found library files under
diferent directories. Which one is newlib? Are they all collectively
newlib?



Martin Thomas wrote:
>> The Atmel demo project supplied its own libraries "libc.a, libgcc.a and
>> libm.a" does anybody know where these libraries come from?
> I did not notice this. Could you please give the URL from where you have
> downloaded the demo?
>
>> Can anybody
>> tell me how to use Newlib with Yagarto. I dont want to have to compile
>> it myself. Is the newlib library available already compiled for arm?
>> Does Yagarto come with Newlib?
> http://www.yagarto.de/ : ...Newlib-1.16.0...

Author: Martin Thomas (mthomas) (Moderator)
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Well, I can not speak for Yagarto, but as far as I know Michael an I use
the same code-base (binutils, gcc, newlib), similar
configuration-options and build-methods.

> So how in the makefile do I tell the linker to use Yagarto's newlib?
Pass -lc and -lm as options for linking. libc.a and libm.a are both
based on the newlib-sources, so you use "Yagarto's newlib". Make sure to
call the linker through the front-end (arm-elf-gcc), do not use direct
calls to the linker (arm-elf-ld). This will avoid problems.

> I  have searched the yagarto directory and have found library files under
> diferent directories.
Yes, it's because the toolchain supports different targets (i.e. ARM,
thumb, little-endian, big-endian). There are special "builds" of libm.a
and libc.a for every target (read about multilibs in the binutils and
gcc documentation).

> Which one is newlib?
All of them are based on the newlib-sources.

> Are they all collectively newlib?
Just different libraries based on the same code. Look into the map-file
and disassembly, the full path to the used libc.a and libm.a should be
shown for every runtime-library function.

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