sun 0s -> gcc ERROR question

["Jim M." <msg124@hotmail.com>]

HI,
How can i compile myapp using gcc. How can modify the makefile
to compile and run with gcc instead of sun compiler.
it gives me the following error.
Jim


myserver% make
/usr/local/bin/gcc  -D_KERNEL -xarch=v9 -xcode=abs32 -xregs=no%appl -xO3  -c 
ast
ropci.c
gcc: language O3 not recognized         <------ERROR
gcc: myapp.c: linker input file unused since linking not done
ld -r myapp.o -o myapp
ld: fatal: file myapp.o: open failed: No such file or directory
make: *** [myapp] Error 1

******************************888
myserver% cat Makefile
CC = /usr/local/bin/gcc
#DEFS = -D_KERNEL -DSOLARIS2_7

CFLAGS = -D_KERNEL -xarch=v9 -xcode=abs32 -xregs=no%appl -xO3

LD = ld
LDFLAGS = -r

SRCS = myapp.c myapp_impl.h myapp_io.h
DOCS =

%.o : %.c
        $(CC) $(CFLAGS) $(DEFS) -c $<

myapp: myapp.o
        $(LD) $(LDFLAGS) myapp.o -o myapp

install: myapp
        echo "You must be superuser to install"
        cp -p myapp /kernel/drv/sparcv9/
        cp -p myapp.conf /kernel/drv/
        add_drv -i '"pci1057,1801"' -m '* 0666 bin bin' myapp

reinstall: myapp
        echo "You must be superuser to re-install"
        rem_drv myapp
        cp myapp /kernel/drv/sparcv9/
        add_drv -i '"pci1057,1801"' -m '* 0666 bin bin' myapp

clean:
        $(RM) myapp.o myapp .myapp*

pack: myapp clean
        tar cvf myapp.tar  myapp $(SRCS) Makefile $(DOCS)
        compress myapp.tar

myapp.o : myapp.c




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