Andrew, Thanks you for your quick response. I give no argument to 'as', the 'as' is called be 'ccppc' automatically. Below, I give the ccppc argument and error message output during the operation. Thanks. ccppc -mcpu=604 -mstrict-align -mno-implicit-fp -ansi -O2 -fvolatile -fno-builtin -I. -I/bld/niu/vxWorks6.2/vxworks-6.2/header -I/bld/niu/vxWorks6.2/vxworks-6.2/target/config -I/bld/niu/vxWorks6.2/vxworks-6.2/target/config/UTP -I/bld/niu/vxWorks6.2/vxworks-6.2/../gnu/3.3.2-vxworks-6.2/sun4-solaris2/lib /gcc-lib/powerpc-wrs-vxworks/3.3.2/include -I/bld/niu/vxWorks6.2/vxworks-6.2/target/config/UTP -I/bld/niu/vxWorks6.2/vxworks-6.2/target/h/arch/ppc -I/bld/niu/vxWorks6.2/vxworks-6.2/target/h/types -I/bld/niu/vxWorks6.2/vxworks-6.2/target/h/arch/arm -I/bld/niu/vxWorks6.2/vxworks-6.2/target/h/arch/sh -I. -I/bld/niu/vxWorks6.2/vxworks-6.2/target/config/all -I/bld/niu/vxWorks6.2/vxworks-6.2/target/h -I/bld/niu/vxWorks6.2/vxworks-6.2/target/h/wrn/coreip -I/bld/niu/vxWorks6.2/vxworks-6.2/target/src/config -I/bld/niu/vxWorks6.2/vxworks-6.2/target/config/comps/src -I/bld/niu/vxWorks6.2/vxworks-6.2/target/config/comps/src/dosfs2 -I/bld/niu/vxWorks6.2/vxworks-6.2/target/src/drv -DCPU=PPC604 -DTOOL_FAMILY=gnu -DTOOL=gnu -D_WRS_KERNEL -DCPU_VARIANT=_745x -DBOOTROM -g -dA -dr -xassembler-with-cpp -c -o romInit.o romInit.s as: error: unknown option '-' as: error: unknown option 'g' as: error: unknown option 'd' as: error: unknown option 'arf2' as: error: unknown option 'p' as: error: unknown option 'p' M4 does not have browser support, disabling browser (-b) option as: error: unknown option 'g' usage: as [-V] [-Q{y,n}] [-f[O][if]#] [-q] [-s] [-S] [-K {pic,PIC}] [-o objfile] [-L] [-T] [-P [[-Ipath] [-Dname] [-Dname=def] [-Uname]]...] [-m [-Ym,path]] [-n] [-ul] [-xF] [-xarch=v7] [-xarch=v8] [-xarch=v8a] [-xarch=v8plus] [-xarch=v8plusa] [-xarch=v8plusb] [-xarch=v9] [-xarch=v9a] [-xarch=v9b] [-xcode={pic13,pic32}] file.s... make: *** [romInit.o] Error 1 Niu Baoqiang(Henry) Tel :86-10-58606270 e-mail: niu@xxxxxxxxxx -----Original Message----- From: Andrew Haley [mailto:aph@xxxxxxxxxx] Sent: Thursday, August 03, 2006 5:09 PM To: Niu, Bao Qiang (Henry) Cc: gcc-help@xxxxxxxxxxx Subject: Re: A question about assembler Do not cross post to gcc and gcc-help. This is highly abusive behaviour. What argument did you pass to -with-as= when you ran configure? Andrew.