avr-gcc refusing to link against avr-libc in Fedora 23

[spike]

Hi everyone,

I'm trying to get avr-gcc to link against library that I built (which is just the
arduino core library):

avr-gcc -Wl,-Map,ArduinoTest.map -mmcu=atmega328p -o "ArduinoTest.elf"  ./main.o
  -l/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a
/usr/lib/gcc/avr/4.9.3/../../../../avr/bin/ld: cannot find
-l/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a

alghough: ls -lah /home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a 
-rw-rw-r-- 1 spike spike 56K 28. Jul 03:50
/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a

Yes, the 'liblib' is a bit of a screw up on my side, it's late here, can't
be bothered at the moment. Rest assured that the paths and filenames are correct. :)

Could it be that the current avr-gcc that's in Fedora 23 (and it seems also in 24 and
rawhide) is just not playing nicely with the (apparently pretty ancient) avr-libc version?
Something was mentioned here:
http://stackoverflow.com/questions/31740435/cannot-compile-and-link-avr-p...
We're on version 1.8.0 in Fedora 23 and 24 and apparently version 1.8.1 has been
released in 2014 and version 2.0.0 has been out since 02/2016. Any chance, there's an
update for me to try out somewhere without having to recompile avr-libc myself?

Cheers!

[Thibault North]

On Thu, Jul 28, 2016 at 4:07 AM, spike <spikefedora(a)gmail.com&gt; wrote:
>  [snap]
>  Could it be that the current avr-gcc that's in Fedora 23 (and it seems also in 24 and
> rawhide) is just not playing nicely with the (apparently pretty ancient) avr-libc version?
> Something was mentioned here:
> http://stackoverflow.com/questions/31740435/cannot-compile-and-link-avr-p...
>  We're on version 1.8.0 in Fedora 23 and 24 and apparently version 1.8.1 has been
> released in 2014 and version 2.0.0 has been out since 02/2016. Any chance, there's an
> update for me to try out somewhere without having to recompile avr-libc myself?
>
>  Cheers! 
You're right that avr-libc is outdated. Would you mind testing this
scratch build and testing it with your avr-gcc?Available here:
https://kojipkgs.fedoraproject.org//work/tasks/6378/15046378/avr-libc-2.0...

In fact, up to now the Atmel AVR distribution patches have been
included in Fedora's avr-libc package to make sure that we support all
chips. Nowadays, Atmel does not ship patches anymore, but patched
sources of avr-libc, avr-gcc, avr-binutils and avr-gdb here:
http://distribute.atmel.no/tools/opensource/Atmel-AVR-GNU-Toolchain/3.5.3/
The scratch build above doesn't provide Atmel patches, though, this
still needs work, but I'll be interested to know if it compiles in the
current state?

Thanks,
Thibault

[spike]

Hi Thibault,

On 28.07.2016 13:00, Thibault North wrote:
>  You're right that avr-libc is outdated. Would you mind testing
> this
>  scratch build and testing it with your avr-gcc?Available here:
>
> https://kojipkgs.fedoraproject.org//work/tasks/6378/15046378/avr-libc-2.0...
Thanks a bunch for the scratch build! Unfortunately the error remains unchanged :(

>  In fact, up to now the Atmel AVR distribution patches have been
>  included in Fedora's avr-libc package to make sure that we support all
>  chips. Nowadays, Atmel does not ship patches anymore, but patched
>  sources of avr-libc, avr-gcc, avr-binutils and avr-gdb here:
>  http://distribute.atmel.no/tools/opensource/Atmel-AVR-GNU-Toolchain/3.5.3/
>  The scratch build above doesn't provide Atmel patches, though, this
>  still needs work, but I'll be interested to know if it compiles in the
>  current state? 
It was a shot in the dark since I don't know how I'd investigate further at this
point. Maybe I'm missing the obvious. Is there some piece of information that would be
helpful to sort out, what's going on? Btw: I've tried the c++ compiler/linker as
well, same story...

Cheers!

[spike]

On 28.07.2016 13:37, spike wrote:
>  Is there some piece of information that would be helpful to sort out,
> what's going on? Btw: I've tried the c++ compiler/linker as well, same story...
Here's some more verbose output. It's not unlikely that this is a pebkac error...

$ avr-g++ -v -Wl,-Map,ArduinoTest_cpp.map,--cref -mrelax -Wl,--gc-sections
-mmcu=atmega328p -o "ArduinoTest_cpp.elf"  ./main.o  
-l"/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a"
Using built-in specs.
COLLECT_GCC=/usr/bin/avr-g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/avr/4.9.3/lto-wrapper
Target: avr
Configured with: ../gcc-4.9.3/configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --target=avr --enable-languages=c,c++ --disable-nls
--disable-libssp --with-system-zlib --enable-version-specific-runtime-libs
--with-pkgversion='Fedora 4.9.3-1.fc23'
--with-bugurl=https://bugzilla.redhat.com/
Thread model: single
gcc version 4.9.3 (Fedora 4.9.3-1.fc23) 
COMPILER_PATH=/usr/libexec/gcc/avr/4.9.3/:/usr/libexec/gcc/avr/4.9.3/:/usr/libexec/gcc/avr/:/usr/lib/gcc/avr/4.9.3/:/usr/lib/gcc/avr/:/usr/lib/gcc/avr/4.9.3/../../../../avr/bin/
LIBRARY_PATH=/usr/lib/gcc/avr/4.9.3/avr5/:/usr/lib/gcc/avr/4.9.3/../../../../avr/lib/avr5/:/usr/lib/gcc/avr/4.9.3/:/usr/lib/gcc/avr/4.9.3/../../../../avr/lib/
COLLECT_GCC_OPTIONS='-v' '-mrelax' '-mmcu=atmega328p' '-o'
'ArduinoTest_cpp.elf'
 /usr/libexec/gcc/avr/4.9.3/collect2 -plugin /usr/libexec/gcc/avr/4.9.3/liblto_plugin.so
-plugin-opt=/usr/libexec/gcc/avr/4.9.3/lto-wrapper
-plugin-opt=-fresolution=/tmp/ccui8D2E.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lm -plugin-opt=-pass-through=-lc --relax -m avr5 -Tdata
0x800100 -o ArduinoTest_cpp.elf /usr/lib/gcc/avr/4.9.3/../../../../avr/lib/avr5/crtm328p.o
-L/usr/lib/gcc/avr/4.9.3/avr5 -L/usr/lib/gcc/avr/4.9.3/../../../../avr/lib/avr5
-L/usr/lib/gcc/avr/4.9.3 -L/usr/lib/gcc/avr/4.9.3/../../../../avr/lib -Map
ArduinoTest_cpp.map --cref --gc-sections ./main.o
-l/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a -lgcc -lm --start-group
-lgcc -lm -lc --end-group
/usr/lib/gcc/avr/4.9.3/../../../../avr/bin/ld: cannot find
-l/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a
collect2: error: ld returned 1 exit status

[Jonathan Wakely]

On 28/07/16 13:41 +0200, spike wrote:
> On 28.07.2016 13:37, spike wrote:
> > Is there some piece of information that would be helpful to sort out, what's
> going on? Btw: I've tried the c++ compiler/linker as well, same story...
>
> Here's some more verbose output. It's not unlikely that this is a pebkac error...
It is.

> $ avr-g++ -v -Wl,-Map,ArduinoTest_cpp.map,--cref -mrelax
> -Wl,--gc-sections -mmcu=atmega328p -o "ArduinoTest_cpp.elf"  ./main.o  
> -l"/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a" 
That's not how you find libraries.

Either use
/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a
without the -l option or use
-L/home/spike/workspaceAVR/libarduino/328P_16MHz -llibarduino

But "liblibarduino.a" looks wrong as well, so it should be:

-L/home/spike/workspaceAVR/libarduino/328P_16MHz -larduino

[spike]

On 28.07.2016 13:56, Jonathan Wakely wrote:
>  On 28/07/16 13:41 +0200, spike wrote:
> > Here's some more verbose output. It's not unlikely that this is a pebkac
> error...
>  
>  It is. 
You, Sir, are 100% correct and made my day!


> > $ avr-g++ -v -Wl,-Map,ArduinoTest_cpp.map,--cref -mrelax
> -Wl,--gc-sections -mmcu=atmega328p -o "ArduinoTest_cpp.elf"  ./main.o  
> -l"/home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a"
>  
>  That's not how you find libraries.
>  
>  Either use
>  /home/spike/workspaceAVR/libarduino/328P_16MHz/liblibarduino.a
>  without the -l option or use
>  -L/home/spike/workspaceAVR/libarduino/328P_16MHz -llibarduino
>  
>  But "liblibarduino.a" looks wrong as well, so it should be:
>  
>  -L/home/spike/workspaceAVR/libarduino/328P_16MHz -larduino 
I've used eclipse to set this up and for some odd reason my "library paths"
tab in the project settings is gone. It was pretty late last night and I didn't notice
that I've put the lib under the "library" tab (which corresponds to -l) and
for some reason didn't see the small letter/capital letter change. I ran so far down a
completely different path that I just didn't see the obvious.

Thanks a lot for helping me out and sorry for the noise. :)