Re: gas: undefined symbol in immediate operand

[Nick Clifton <nickc at redhat dot com>]

Hi Jeremy,

> I'm using a pre-built ARM toolchain (supplied with an embedded development
> system) running on Windows under cygwin. 

I think that you must have an old version of the ARM assembler.  The 
current versions definitely do report an error for the use of an 
undefined symbol as an immediate operand.

> We've also tried this on a more recent PowerPC toolchain, this time running
> on Linux and get a similar result:

> The objdump output shows that the assembler hasn't created a relocation
> entry for the undefined "moo" symbol,

What objdump output ?  When I tried running objdump I saw this:

  $ objdump -Dr test.o

  test.o:     file format elf32-powerpc

  Disassembly of section .text:

  00000000 <_start>:
     0:   3f e0 00 00     lis     r31,0
                        2: R_PPC_ADDR16_HI      moo
     4:   3f e0 ff 00     lis     r31,-256
     8:   4e 80 00 20     blr

Which clearly does show the reloc against symbol "moo".  Furthermore, 
when I tried to link this object file, I received an error message:

  $ ld test.o
  test.o: In function `_start':
  (.text+0x2): undefined reference to `moo'

This is which an assembler and linker compiled from today's binutils 
sources.

Cheers
  Nick