Lpc2000

Hi,
I've changed my gcc compiler form gcc-3.3.1 to gnuarm's gcc-4.0.1. 
While integrating with Keil's uVision3 IDE I'm getting (while linking) 
above mentioned error (for every *.o file created from *.c).
I checked out, that the error does't occur when disabling option 
"Enable ARM/Thumb Interworking" on Assembler tab in "Options for 
Target..." dialog box. So, occuring (while linking with arm-elf-ld) of 
this error is related to way of assembling Startup.s file (with or 
without option -mthumb-interwork).
What could be reason of such behaviour? With gcc-3.3.1 it was ok.

Regards,
Arek