cross compile gcc 10.1.0 on linux for avr fails

[Klaus Rudolph <lts-rudolph@xxxxxx>]

I try to compile gcc 10.1.0 for target avr. If fails with:


make[2]: Entering directory
'/home/krud/git_my_checkout/first/own_components/gcc_install/gcc/gcc-10.1.0/build/gcc'
g++ -c   -g -O2 -DIN_GCC  -DCROSS_DIRECTORY_STRUCTURE   -fno-exceptions
-fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wno-error=format-diag
-Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings   -DHAVE_CONFIG_H
-DGENERATOR_FILE -fno-PIE -I. -Ibuild -I../../gcc -I../../gcc/build
-I../../gcc/../include  -I../../gcc/../libcpp/include  \
	-o build/genmodes.o ../../gcc/genmodes.c
/opt/avr_10.1.0/avr/bin/as: unrecognized option '--64'


As I see it tries to use gcc to compile and link with avr-as which is
wrong. What did I wrong?


I simply do
make binutils
make gcc
with the following makefile




PREFIX=/opt
VERSION_BINUTILS=2.34
VERSION_GCC=10.1.0
GCC_DOWNLOAD_SUBDIR=gcc-10.1.0
MPC_VERSION=1.0.3
MPFR_VERSION=3.1.4
GMP_VERSION=6.1.0

binutils:
    mkdir binutils
    ( cd binutils; \
        wget https://ftp.gnu.org/gnu/binutils/binutils-2.34.tar.xz; \
        tar xf binutils-2.34.tar.xz ; \
        cd binutils-2.34 ; \
        mkdir build ; \
        cd build ; \
        ../configure --target=avr --prefix=$(PREFIX)/avr_$(VERSION_GCC) ;\
        make -j8 ; \
        sudo make install ; \
        )

gcc:
    mkdir gcc
    ( cd gcc; \
        wget
https://ftp.gnu.org/gnu/gcc/$(GCC_DOWNLOAD_SUBDIR)/gcc-$(VERSION_GCC).tar.xz
; \
        tar xf gcc-$(VERSION_GCC).tar.xz ; \
        cd gcc-$(VERSION_GCC)/ ; \
        wget
https://gcc.gnu.org/pub/gcc/infrastructure/mpc-$(MPC_VERSION).tar.gz ; \
        tar xf mpc-$(MPC_VERSION).tar.gz ; \
        mv mpc-$(MPC_VERSION) ./mpc ; \
        wget
https://gcc.gnu.org/pub/gcc/infrastructure/mpfr-$(MPFR_VERSION).tar.bz2 ; \
        tar xf mpfr-$(MPFR_VERSION).tar.bz2 ; \
        mv mpfr-$(MPFR_VERSION) ./mpfr ; \
        wget
https://gcc.gnu.org/pub/gcc/infrastructure/gmp-$(GMP_VERSION).tar.bz2 ; \
        tar xf gmp-$(GMP_VERSION).tar.bz2 ; \
        mv gmp-$(GMP_VERSION) ./gmp ; \
        mkdir build ; \
        cd build ; \
        ../configure --prefix=$(PREFIX)/avr_$(VERSION_GCC) --target=avr
--enable-languages=c,c++ --enable-lto --disable-nls --disable-libssp ; \
        make -j8 ; \
        sudo make install ; \
        )