I have a lot of projects with stm32f1xx CPUs (cortex-m3), all is good 
with them.
Now I decided to make project with stm32f051 (cortex-mo), and linker 
works with errors.
I have several cpp files (task is to light-up LED), they are compiled 
with no errors when any of cortex-m3 or cortex-m0 is set as mcpu.
But linker works ok with mcpu=cortex-m3 option, and with errors with 
mcpu=cortex-m0. But still linker says that job is done.
I use Yagarto with GCC v.4.7.2.
Here is output:

arm-none-eabi-g++ -T"D:\Nute\_tmp_\f0test\STM32F051R8.ld" -Xlinker 
--gc-sections -Wl,-Map,f0test.map -mcpu=cortex-m0 -mthumb -o 
"f0test.elf"  ./src/main.o  ./lib/src/stm32f0xx_rcc.o 
./lib/startup_stm32f0xx.o ./lib/system_stm32f0xx.o  ./kl_lib/kl_lib_f0.o

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
lib/crt0.o:  Conflicting CPU architectures 11/1

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: ./lib/src/stm32f0xx_rcc.o: Unknown CPU architecture

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: ./lib/system_stm32f0xx.o: Unknown CPU architecture

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/thumb/v6m\libgcc.a(_udivsi 
3.o):  Unknown CPU architecture

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
lib/thumb/v6m\libc.a(lib_a-atexit.o):  Unknown CPU architecture

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
lib/thumb/v6m\libc.a(lib_a-fini.o):  Unknown CPU architecture

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
lib/thumb/v6m\libc.a(lib_a-init.o):  Unknown CPU architecture
Finished building target: f0test.elf

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
lib/thumb/v6m\libc.a(lib_a-__atexit.o):  Unknown CPU architecture

c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/../../../../arm-none-eabi/ 
bin/ld.exe:  error: 
c:/yagarto/bin/../lib/gcc/arm-none-eabi/4.7.2/thumb/v6m/crtend.o: 
Unknown CPU architecture

Invoking: ARM Yagarto Windows GNU Create Flash Image
arm-none-eabi-objcopy -O ihex f0test.elf  "f0test.hex"
Finished building: f0test.hex

When I use option -nostartfiles, obviously I have an error that _init() 
is not found.

What is wrong with cortex-m0? Cortex-m3 is ok with same options.
Thanks in advance!

Hmm, and what can I do with these letters 3 years old? Was those patch 
not included in GCC v.4.7.2?

Thank you, Martin, I will try tools you mentioned.
Actually, I solved the issue by adding -nostartfiles to linker options 
and implementing empty _init() function.

prasad wrote:
> I am trying to build arm compiler tool chain for cortex a9 processor for
> freescale on redhat platform.. can any one suggest me the compatible
> versions of gcc lib, gcc, gnuutil along with kernel header files..

Please open another thread if your question is not related to the 
original post. Anyway: the question implies that you are looking for an 
arm-linux cross-compiler. Information, Code and Binaries available from 
http://www.linaro.org/ should be a good starting-point.