Re: Build gcc 10.3.0 for avr on a amd64 linux host

[BERTRAND Joël]

Senthil Kumar a écrit :
> On Sat, May 22, 2021 at 1:21 AM BERTRAND Joël <joel.bertrand@systella.fr> 
> wrote:
>>
>>         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...
> 
> Did you try building and installing avr-libc also at the same --prefix 
> location?

        No, avr-libc is installed in /usr/lib/avr, but I have tried to add
LDFLAGS on configure command line without any success.

        I have tried to build cross compiler with ct-ng also without any
success (from gcc 6.x to 11.x). Same error. ct-ng builds its own
avr-libc and doesn't use system avr-libc.

        Best regards,

        JB