populate_sdk and external toolchain

I am trying to build sdk (using populate_sdk option). Toolchain being used is an external one.

When I run bitbake core-image-minimal -c populate_sdk, I get the below error

| checking for x86_64-pokysdk-linux-gcc... /home/manish/poky/build/tmp/work/x86_64-linux/gcc-crosssdk-initial-x86_64/5.2.0-r0/gcc-5.2.0/build.x86_64-linux.x86_64-pokysdk-linux/./gcc/xgcc -B/home/manish/poky/build/tmp/work/x86_64-linux/gcc-crosssdk-initial-x86_64/5.2.0-r0/gcc-5.2.0/build.x86_64-linux.x86_64-pokysdk-linux/./gcc/ -B/home/manish/poky/build/tmp/sysroots/x86_64-linux/usr/x86_64-pokysdk-linux/bin/ -B/home/manish/poky/build/tmp/sysroots/x86_64-linux/usr/x86_64-pokysdk-linux/lib/ -isystem /home/manish/poky/build/tmp/sysroots/x86_64-linux/usr/x86_64-pokysdk-linux/include -isystem /home/manish/poky/build/tmp/sysroots/x86_64-linux/usr/x86_64-pokysdk-linux/sys-include --sysroot=/home/manish/poky/build/tmp/work/x86_64-linux/gcc-crosssdk-initial-x86_64/5.2.0-r0/gcc-5.2.0/build.x86_64-linux.x86_64-pokysdk-linux/tmpsysroot
| checking for suffix of object files... configure: error: in `/home/manish/poky/build/tmp/work/x86_64-linux/gcc-crosssdk-initial-x86_64/5.2.0-r0/gcc-5.2.0/build.x86_64-linux.x86_64-pokysdk-linux/x86_64-pokysdk-linux/libgcc':
| configure: error: cannot compute suffix of object files: cannot compile

Is it possible to remove gcc-crosssdk from populate_sdk script ?

there should be a config.log file in build directory of libgcc which should have more details as to why compiler failed