Hi Mallikarjun, >> arm-none-eabi-gcc -mcpu=cortex-m0 -mthumb -mfloat-abi=soft -c test.c I built toolchain with gcc-4.9.0 source code and I just ran your test case with your used provided Command. It is running without any error. Regards, Sandeep Kumar Singh Senior Technical member staff, AESBU - Infotainment & Clusters KPIT Technologies Limited Phone: +91-20-66525000 | cell: +91-9730704579