[En-Nut-Discussion] Problem with recent Arm-non-eabi-gcc and libs

Philipp Burch phip at hb9etc.ch
Mon Feb 15 07:48:52 CET 2021

Hi Uwe!

On 02.02.21 17:28, Uwe Bonnes wrote:
> Hello,
> with recent gcc-arm-none-eabi-10-2020-q4-major and probably the other
> 2020 release,  multiple problems happen in different incarnations
> depending on the link option
> - with only nut libc, binaries get substantial bigger
> - with nanolib, crashed like this appear:
> [...]
> etc.
> Do people have better experiences or hints for me?
> Thanks

My experiences are actually worse. I used GCC 7.3 (from 2018, the last 
in gcc-arm-embedded debian package) so far and recently tried to update 
to GCC 9.2 (the most recent in gcc-arm-none-eabi Ubuntu 20.04 package), 
but this version even fails to link the application with multiple 
definitions of OS functions:

------- 8< ------- 8< -------

arm-none-eabi-gcc main.o ... -Wl,--defsym=ccm_length=0 
-Wl,--defsym=ram1_length=0 -Wl,--defsym=ram2_length=0 -mcpu=cortex-m4 
-mthumb -D__CORTEX__ -mfloat-abi=hard -mfpu=fpv4-sp-d16 -nostartfiles 
-L/.../ldscripts -Ttm4c1294ncpdt_flash.ld 
-L/.../nutbld/lib -Wl,--defsym=bootloader_offset=0x8000 
-Wl,--start-group /.../nutbld/lib/nutinit.o -lnutpro -lnutnet -lnutfs 
-lnutos -lnutgorp -lnutcrt -lnutdev -lnutarch -lm -lnutc 
-Wl,--end-group -o poleno18_control_board.elf

in function `fflush':

multiple definition of `fflush'; 
/.../nutbld/lib/libnutcrt.a(fflush.o):fflush.c:(.text.fflush+0x0): first 
defined here

in function `fclose':

multiple definition of `fclose'; 
/.../nutbld/lib/libnutcrt.a(fclose.o):fclose.c:(.text.fclose+0x0): first 
defined here

/usr/lib/gcc/arm-none-eabi/9.2.1/../../../arm-none-eabi/bin/ld: section 
.ARM.exidx LMA [00000000000728a8,00000000000728af] overlaps section 
.data LMA [00000000000728a8,0000000000073aff]

etc. for abort, _kill_r, _getpid_r, _fstat_r, ...

------- 8< ------- 8< -------

I haven't investigated any further yet, maybe it's just a simple option 
that needs to be updated.

Did you need to change anything for the link stage itself to succeed?

Best regards,

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