Re: [avr-gcc-list] Help Patching gcc for mega48/88

[address@hidden]

E. Weddington wrote:

> address@hidden wrote:
>
> > I am a little confused about gcc support for mega48/88.
> >
> > I would like to build gcc-avr for my linux boax.  From what I 
> > understand gcc 3.4.3 does not support mega48/88, but I noticed that 
> > WinAVR gcc 3.4.3 supports mega48/88 .. idential version numbers.
> > Further, there has been some discussion about patching the compiler, 
> > which unfortunately I could use some direction.
> > Basically, I need help on how to get my linux gcc 3.4.3 compiler to 
> > support mega48/88.
> Support for those devices (and some others) are in GCC 4.0 branch in 
> CVS, and binutils HEAD CVS, i.e. they are not released yet for those 
> projects.
> Support for those devices *is* included in the latest release of 
> avr-libc, version 1.2.3.
>
> There are patches for Binutils 2.15 and GCC 3.4.x series in the 
> avr-libc project Patch Manager. You can find them here:
> <http://savannah.nongnu.org/patch/?func=detailitem&item_id=2923>
>
> You will want the files:
> gcc-3_4_x-avr-new-devs2.patch
> binutils-avr-new-devs.patch
>
> These files are listed down towards the bottom of the tracker. These 
> are the patches that WinAVR uses to provide support for these devices.
>
> Again, you do NOT need to patch avr-libc, just get the latest release.
> <https://savannah.nongnu.org/patch/download.php?item_id=2923&item_file_id=4131> 
>
> HTH
> Eric

Thanks for the help Eric.

I was able to patch the binutls and the gcc for support of the 
mega48/88.   I can dump the specs on gcc and confiirm this.

However, when I goto make my project the linker is unable to locate the 
crtm48.o file (see below).  I was under the impression avr-gcc knows 
were the approprieate file are?

Linking: app.elf
avr-gcc -mmcu=atmega48 -I. -gstabs -g -mmcu=atmega48 -DF_CPU=8000000UL 
-DTICK_FREQ=1000 -DISR_FREQ=5000 -DTIMER_ISR=SIG_OUTPUT_COMP  -O3 
-funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall 
-Wstrict-prototypes -Wa,-adhlns=onethread_sch.o  -std=gnu99 -MD -MP -MF 
.dep/app.elf.d onethread_sch.o rtk.o timer.o --output app.elf 
-Wl,-Map=app.map,--cref    -lm
/usr/local/lib/gcc/avr/3.4.3/../../../../avr/bin/ld: crtm48.o: No such 
file: No such file or directory
make: *** [app.elf] Error 1