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_build/gcc-4.6.2/host-x86_64-unknown-linux-gnu/gcc/ -B/data/data6/soft/programming/gcc-avr/avr/bin/ -B/data/data6/soft/programming/gcc-avr/avr/lib/ -isystem /data/data6/soft/programming/gcc-avr/avr/include -isystem /data/data6/soft/programming/gcc-avr/avr/sys-include 
checking for suffix of object files... configure: error: in `/data/data6/soft/src_build/gcc-4.6.2/avr/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.

In my gcc-4.6.2/avr/libgcc/config.log I found:

configure:3268: /data/data6/soft/src_build/gcc-4.6.2/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/data/data6/soft/src_build/gcc-4.6.2/host-x86_64-unknown-linux-gnu/gcc/ -B/data/data6/soft/programming/gcc-avr/avr/bin/ -B/data/data6/soft/programming/gcc-avr/avr/lib/ -isystem /data/data6/soft/programming/gcc-avr/avr/include -isystem /data/data6/soft/programming/gcc-avr/avr/sys-include -c -g -O2 conftest.c >&5
exec: 89: -o: not found
configure:3272: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "GNU C Runtime Library"
| #define PACKAGE_TARNAME "libgcc"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "GNU C Runtime Library 1.0"
| #define PACKAGE_BUGREPORT ""
| /* end confdefs.h. */
| 
| int
| main ()
| {
| 
| ;
| return 0;
| }
configure:3286: error: in `/data/data6/soft/src_build/gcc-4.6.2/avr/libgcc':
configure:3289: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.

If this command run directly (after creating conftest.c) output will be same.

What is exec: 89: -o: not found? Which program write it? Where is 89 line?

Solutions like exporting LD_CONFIG_PATH or adding lines in /etc/ld.so.conf with path to GMP, MPFR, MPC not work for me.

Where find solution for this problem?

Update. It seems is configuration problem. Gcc has very good option -v :-) And i see that is assembler call from gcc, which fails. With option -save-temps i saved assembler source, and run assembler, but it doesnn't matter.

Instead of calling real assembler it calls shell-script wrapper, in my case /data/data6/soft/src_build/avr-gcc/gcc/as, which begins from:

ORIGINAL_AS_FOR_TARGET=""
ORIGINAL_LD_FOR_TARGET=""
ORIGINAL_PLUGIN_LD_FOR_TARGET=""
ORIGINAL_NM_FOR_TARGET=""

And when it form command-line call, we have this:

exec -o conftest.o conftest.s

which fails as described above.

Where is necessary fix this? To get call like this: exec as -o conftest.o conftest.s

Where good place to set variable ORIGINAL_AS_FOR_TARGET?

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.