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Altera_Forum's avatar
Altera_Forum
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21 years ago

Compile errors on RTOS demo

I have this problem reported as a service call at Accelerated Technology/

Mentor Graphics (people who make Nucleus Plus RTOS), but thought I'd

check here and see if others may be having the same problem. ATI/MG

is looking at it right now.

Target is 1C20 (Altera demo board).

I get the following errors from the linker: 

C:\MGC\embedded\Nucleus\Plus\Demo>nios2-elf-ld -g o\demo.o -o o\Plus_Demo.out -N -Map o\Plus_demo.map -( ..\..\lib\Plus.lib -T..\..\plus\demo\link_ram.ld -)
..\..\lib\Plus.lib(sdc.o): In function `SDC_Set_Baud_Rate':
sdc.o(.text+0x9f8): undefined reference to `__udivsi3'
..\..\lib\Plus.lib(quc.o): In function `QUC_Create_Queue':
quc.o(.text+0x108): undefined reference to `__udivsi3'

Those two errors are generated from a if (a < (b/c)) type conditional.

Everything in the library is compiled with the no-hw-div flag.

Any clues?

John

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    The problem here looks like ld is being used to link, if gcc were used to link, the correct multilibs would be picked up (there is a different C library depending on whether you have hw mul or not) and the gcc support library would be linked in (which provides functions for operations the processor does not handle natively, e.g. divide, multiply, floating point operations). The name of that library is libgcc.a and is located (depending on multilibs) in this directory structure: <KIT>\bin\nios2-gnutools\H-i686-pc-cygwin\lib\gcc-lib\nios2-elf.3.3

    Jonah
  • Altera_Forum's avatar
    Altera_Forum
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    21 years ago

    Thanks for the help, Jonah. I changed my linking .bat file to reference the libgcc.a as shown: 

    NIOS2-ELF-LD -g o\demo.o -o o\Plus_Demo.out -N -Map o\Plus_demo.map -( \altera\kits\nios2\bin\nios2-gnutools\H-i686-pc-cygwin\lib\gcc-lib\nios2-elf.3.3\libgcc.a ..\..\lib\Plus.lib -T..\..\plus\demo\link_ram.ld   -)

    and now it seems to link.

    Next stop is to get the debugger working (we have the FS2 JTAG debugger) and prove that it works. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif

    John