Build gcc 10.3.0 for avr on a amd64 linux host

[BERTRAND Joël]

        Hello,

        I'm trying to build a recent gcc to check if my issue comes from
compiler or not. Thus, I have downloaded gcc 10.3.0 sources. Of course,
on my debian/testing workstation, I have avr avr-binutils and avr-libc.

        I have configured gcc with :

hilbert:[~/cvs/cross-gcc/build] > ../gcc-10.3.0/configure -v
--enable-languages=c,c++,fortran --prefix=/home/bertrand/cvs/cross-gcc
--disable-nls --disable-libssp --target=avr --with-dwarf2

but build process hangs with :

make[3] : on quitte le répertoire
« /home/bertrand/cvs/cross-gcc/build/avr/libgcc »
make[2] : on quitte le répertoire
« /home/bertrand/cvs/cross-gcc/build/avr/libgcc »
Checking multilib configuration for libbacktrace...
Configuring in avr/libbacktrace
configure: loading cache ./config.cache
checking build system type... x86_64-pc-linux-gnu
checking host system type... avr-unknown-none
checking target system type... avr-unknown-none
checking for avr-gcc... /home/bertrand/cvs/cross-gcc/build/./gcc/xgcc
-B/home/bertrand/cvs/cross-gcc/build/./gcc/
-B/home/bertrand/cvs/cross-gcc/avr/bin/
-B/home/bertrand/cvs/cross-gcc/avr/lib/ -isystem
/home/bertrand/cvs/cross-gcc/avr/include -isystem
/home/bertrand/cvs/cross-gcc/avr/sys-include
checking whether the C compiler works... no
configure: error: in `/home/bertrand/cvs/cross-gcc/build/avr/libbacktrace':
configure: error: C compiler cannot create executables
See `config.log' for more details
make[1]: *** [Makefile:12412 : configure-target-libbacktrace] Erreur 1
make[1] : on quitte le répertoire « /home/bertrand/cvs/cross-gcc/build »
make: *** [Makefile:938 : all] Erreur 2
hilbert:[~/cvs/cross-gcc/build] >

        Config log contains:
configure:3078: /home/bertrand/cvs/cross-gcc/build/./gcc/xgcc
-B/home/bertrand/cvs/cross-gcc/build/./gcc/
-B/home/bertrand/cvs/cross-gcc/avr/bin/
-B/home/bertrand/cvs/cross-gcc/avr/lib/ -isystem
/home/bertrand/cvs/cross-gcc/avr/include -isystem
/home/bertrand/cvs/cross-gcc/avr/sys-include    -g -O2   conftest.c  >&5
/usr/bin/avr-ld: cannot find -lm
/usr/bin/avr-ld: cannot find -lc
collect2: error: ld returned 1 exit status
configure:3082: $? = 1
configure:3120: result: no
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "package-unused"
| #define PACKAGE_TARNAME "libbacktrace"
| #define PACKAGE_VERSION "version-unused"
| #define PACKAGE_STRING "package-unused version-unused"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| /* end confdefs.h.  */
|
| int
| main ()
| {
|
|   ;
|   return 0;
| }
configure:3125: error: in
`/home/bertrand/cvs/cross-gcc/build/avr/libbacktrace':
configure:3127: error: C compiler cannot create executables
See `config.log' for more details

        OK. xgcc tries to build an avr executable and doesn't find libm and
libc. But even if I add LDFLAGS on configure command line, make always
returns this error. I suppose I have done a mistake...

        Any idea to bulid gcc 10.3.0 ?

        Best regards,

        JB