Compilation gcc 4.6.2 (cannot compute suffix of object files)

Question

Problem when compiling gcc 4.6.2:

checking for avr-gcc... /data/data6/soft/src_build/gcc-4.6.2/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/data/data6/soft/src_buil         


        

Answer 1

I had the same problem cross-compiling for mips.

Step one: Cross-compile the binutils for your target. Install them somewhere sane. I use /usr/local/[target]-gcc

Make sure you configure them with --program-prefix=[target]-

Something like (untested):

configure --prefix=/usr/local/avr-gcc --program-prefix=avr- --target=avr

Then you need to set up some environment variables so GCC can find them:

export AR_FOR_TARGET=/usr/local/avr-gcc/bin/avr-ar
export LD_FOR_TARGET=/usr/local/avr-gcc/bin/avr-ld
export OBJDUMP_FOR_TARGET=/usr/local/avr-gcc/bin/avr-objdump
export NM_FOR_TARGET=/usr/local/avr-gcc/bin/avr-nm
export RANLIB_FOR_TARGET=/usr/local/avr-gcc/bin/avr-ranlib
export READELF_FOR_TARGET=/usr/local/avr-gcc/bin/avr-readelf
export STRIP_FOR_TARGET=/usr/local/avr-gcc/bin/avr-strip
export AS_FOR_TARGET=/usr/local/avr-gcc/bin/avr-as

Now you can configure and compile GCC. Ensure you start from a completely empty build directory, otherwise gcc/as etc won't get recreated.