GCC 4.0.3 Assembler (arm-elf-as) Error

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GCC 4.0.3 Assembler (arm-elf-as) Error
\ Kanwal Preet Singh CHANANA (31 May 2006)

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Subject:	GCC 4.0.3 Assembler (arm-elf-as) Error
Group:	Gcc-help
From:	Kanwal Preet Singh CHANANA
Date:	31 May 2006

Hi,

I am using Gcc-4.0.3 ARM Cross-Compiler for my project. My project was earlier compiled using ADS v1.2 complier. When building assembly files with Gcc-4.0.3, the following error occurs:
../boot.S:1: Error: junk at end of line, first unrecognized character is `-'

The assembly code in first few lines are:
@-----------------------------------------
@ Filename: boot.s -------

The assembler is invoked using following options:
arm-elf-as -mcpu=arm7tdmi -march=armv4t -mthumb -mthumb-interwork -o ../obj/boot.o ../boot.S

Can anybody tell me the problem cause and how to solve it?
Is there any documentation/manual available for "GCC ARM Assembler" ?

Regards,
Kanwal