[avr-gcc-list] unresolved symbol from libgcc.a

[Rolf Ebert]

After cleaning up my project and separating some routines into libraries 
I now get an unresolved symbol when linking.

The output from the final command (with lots of -v) is:

C:\Programme\msys_1.0\mingw\avr_43\bin\avr-gcc.exe b~main.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\bf_cnt.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\counters.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\crc8.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\dataflash.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\dataflash-cfg.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\dataflash-output.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\lcd_driver_direct.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\edit_df.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\edit_clock.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\button.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\menu_description.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-avr_wiring.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-commands.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-rom.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-search.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-temperature_sensors.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\sensors-data.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\edit_values.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\setup_clock.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\structure.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\main.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\temperatures.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\bf_volt_temp.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\sensors.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\measurements.o 
-Wl,--gc-sections -gdwarf-2 -Wl,--relax -v -Wl,-Map=main.map,--cref 
--RTS=rts/atmega169 
-LK:\Data\Development\AVR-Ada\apps\Butterfly\logger1\owlib -lonewire 
-LK:\Data\Development\AVR-Ada\apps\Butterfly\logger1\slib -lsht 
-Lk:\Data\Development\AVR-Ada\util\debug\lib -ldebug 
-Lk:\Data\Development\AVR-Ada\avr\atmega169\lib -lavrada -o 
K:\Data\Development\AVR-Ada\apps\Butterfly\logger1\main.elf 
-Lk:\data\development\avr-ada\apps\butterfly\logger1\obj\ 
-Lk:\data\development\avr-ada\avr\atmega169\lib\ 
-Lk:\data\development\avr-ada\util\debug\lib\ 
-Lk:\data\development\avr-ada\apps\butterfly\logger1\owlib\ 
-Lk:\data\development\avr-ada\util\onewire\gobj\ 
-Lk:\data\development\avr-ada\apps\butterfly\logger1\slib\ 
-Lk:\data\development\avr-ada\util\sensirion\obj\ 
-LC:/Programme/msys_1.0/mingw/avr_43/lib/gcc/avr/4.3.2/rts/atmega169\adalib\ 
C:/Programme/msys_1.0/mingw/avr_43/lib/gcc/avr/4.3.2/rts/atmega169\adalib\libgnat.a 
-static-libgcc -Os -mmcu=atmega169 --RTS=rts/atmega169 -fdata-sections 
-ffunction-sections
Using built-in specs.
Target: avr
Configured with: ../gcc-4.3.2/configure --prefix=/mingw/avr_43 
--target=avr --enable-languages=ada,c --with-dwarf2 --disable-nls 
--disable-libssp --disable-libada --with-gmp=/mingw 
--with-bugurl=http://avr-ada.sourceforge.net
Thread model: single
gcc version 4.3.2 (GCC)
COMPILER_PATH=c:/programme/msys_1.0/mingw/avr_43/bin/../libexec/gcc/avr/4.3.2/;c:/programme/msys_1.0/mingw/avr_43/bin/../libexec/gcc/;c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/bin/
LIBRARY_PATH=c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/avr5/;c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/lib/avr5/;c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/;c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/;c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/lib/
COLLECT_GCC_OPTIONS='-gdwarf-2' '-v' '-fRTS=rts/atmega169' 
'-LK:\Data\Development\AVR-Ada\apps\Butterfly\logger1\owlib' 
'-LK:\Data\Development\AVR-Ada\apps\Butterfly\logger1\slib' 
'-Lk:\Data\Development\AVR-Ada\util\debug\lib' 
'-Lk:\Data\Development\AVR-Ada\avr\atmega169\lib' '-o' 
'K:\Data\Development\AVR-Ada\apps\Butterfly\logger1\main.elf' 
'-Lk:\data\development\avr-ada\apps\butterfly\logger1\obj\' 
'-Lk:\data\development\avr-ada\avr\atmega169\lib\' 
'-Lk:\data\development\avr-ada\util\debug\lib\' 
'-Lk:\data\development\avr-ada\apps\butterfly\logger1\owlib\' 
'-Lk:\data\development\avr-ada\util\onewire\gobj\' 
'-Lk:\data\development\avr-ada\apps\butterfly\logger1\slib\' 
'-Lk:\data\development\avr-ada\util\sensirion\obj\' 
'-LC:/Programme/msys_1.0/mingw/avr_43/lib/gcc/avr/4.3.2/rts/atmega169\adalib\' 
'-static-libgcc' '-Os' '-mmcu=atmega169' '-fRTS=rts/atmega169' 
'-fdata-sections' '-ffunction-sections'

c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/bin/ld.exe 
-m avr5 -Tdata 0x800100 -o 
K:\Data\Development\AVR-Ada\apps\Butterfly\logger1\main.elf 
c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/lib/avr5/crtm169.o 
-LK:\Data\Development\AVR-Ada\apps\Butterfly\logger1\owlib 
-LK:\Data\Development\AVR-Ada\apps\Butterfly\logger1\slib 
-Lk:\Data\Development\AVR-Ada\util\debug\lib 
-Lk:\Data\Development\AVR-Ada\avr\atmega169\lib 
-Lk:\data\development\avr-ada\apps\butterfly\logger1\obj\ 
-Lk:\data\development\avr-ada\avr\atmega169\lib\ 
-Lk:\data\development\avr-ada\util\debug\lib\ 
-Lk:\data\development\avr-ada\apps\butterfly\logger1\owlib\ 
-Lk:\data\development\avr-ada\util\onewire\gobj\ 
-Lk:\data\development\avr-ada\apps\butterfly\logger1\slib\ 
-Lk:\data\development\avr-ada\util\sensirion\obj\ 
-LC:/Programme/msys_1.0/mingw/avr_43/lib/gcc/avr/4.3.2/rts/atmega169\adalib\ 
-Lc:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/avr5 
-Lc:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/lib/avr5 
-Lc:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2 
-Lc:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc 
-Lc:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/../../../../avr/lib 
b~main.o k:\data\development\avr-ada\apps\butterfly\logger1\obj\bf_cnt.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\counters.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\crc8.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\dataflash.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\dataflash-cfg.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\dataflash-output.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\lcd_driver_direct.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\edit_df.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\edit_clock.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\button.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\menu_description.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-avr_wiring.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-commands.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-rom.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-search.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\one_wire-temperature_sensors.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\sensors-data.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\edit_values.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\setup_clock.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\structure.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\main.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\temperatures.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\bf_volt_temp.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\sensors.o 
k:\data\development\avr-ada\apps\butterfly\logger1\obj\measurements.o 
--gc-sections --relax -Map=main.map --cref -lonewire -lsht -ldebug 
-lavrada 
C:/Programme/msys_1.0/mingw/avr_43/lib/gcc/avr/4.3.2/rts/atmega169\adalib\libgnat.a 
-lgcc -lc -lgcc
K:\Data\Development\AVR-Ada\apps\Butterfly\logger1\slib\libsht.a(sht-calc.o): 
In function `sht__calc__raw_to_humidity':
sht-calc.adb:(.text+0x5e): undefined reference to `__mulhi3'
sht-calc.adb:(.text+0x7c): undefined reference to `__mulhi3'
avr-gnatlink: error when calling 
C:\Programme\msys_1.0\mingw\avr_43\bin\avr-gcc.exe
avr-gnatmake: *** link failed.
make: *** [main.elf] Error 4


As far as I can see the option -lgcc is the last object to link on the 
resulting command line. And of course libgcc contains the required symbol:

$ avr-gcc -print-libgcc-file-name
c:/programme/msys_1.0/mingw/avr_43/bin/../lib/gcc/avr/4.3.2/libgcc.a
$ avr-nm `avr-gcc -print-libgcc-file-name` | grep mulhi
_mulhi3.o:
00000000 T __mulhi3
0000001e t __mulhi3_exit
00000004 t __mulhi3_loop
0000000c t __mulhi3_skip1

I admit that it is an unusual environment that I am programming in: a 
self built compiler and Ada as programming language on Windows XP.  I 
don't think that the problem I face has anything to do with my setup, 
though.  It is a linker problem, not a compiler problem.

Thanks for any pointer

   Rolf