fyi...

I am using CMake with GNU, that is what is required for the build.

I do source the SDK environment script prior to attempting build.

Here is my current environment-setup-corei7-64-poky-linux script created by SDK:

# Check for LD_LIBRARY_PATH being set, which can break SDK and generally is a bad practice
# http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html#AEN80
# http://xahlee.info/UnixResource_dir/_/ldpath.html
# Only disable this check if you are absolutely know what you are doing!
if [ ! -z "$LD_LIBRARY_PATH" ]; then
    echo "Your environment is misconfigured, you probably need to 'unset LD_LIBRARY_PATH'"
    echo "but please check why this was set in the first place and that it's safe to unset."
    echo "The SDK will not operate correctly in most cases when LD_LIBRARY_PATH is set."
    echo "For more references see:"
    echo "  http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html#AEN80"
    echo "  http://xahlee.info/UnixResource_dir/_/ldpath.html"
    return 1
fi
export SYSROOTS=/ede/smonsees/yocto/testSDK/sysroots
export SDKTARGETSYSROOT=/disk0/scratch/smonsees/yocto/testSDK/sysroots/corei7-64-poky-linux
export PATH=/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/usr/bin:/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/usr/sbin:/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/bin:/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/sbin:/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/usr/bin/../x86_64-pokysdk-linux/bin:/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux:/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/usr/bin/x86_64-poky-linux-musl:/disk0/scratch/smonsees/yocto/testSDK/sysroots/corei7-64-poky-linux/usr/lib/../lib/:/disk0/scratch/smonsees/yocto/testSDK/sysroots/corei7-64-poky-linux/usr/lib/../lib/x86_64-poky-linux/7.3.0/:$PATH
export PKG_CONFIG_SYSROOT_DIR=$SDKTARGETSYSROOT
export PKG_CONFIG_PATH=$SDKTARGETSYSROOT/usr/lib/pkgconfig:$SDKTARGETSYSROOT/usr/share/pkgconfig
export CONFIG_SITE=/disk0/scratch/smonsees/yocto/testSDK/site-config-corei7-64-poky-linux
export OECORE_NATIVE_SYSROOT="/disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux"
export OECORE_TARGET_SYSROOT="$SDKTARGETSYSROOT"
export OECORE_ACLOCAL_OPTS="-I /disk0/scratch/smonsees/yocto/testSDK/sysroots/x86_64-pokysdk-linux/usr/share/aclocal"
unset command_not_found_handle
export CC="x86_64-poky-linux-gcc  -v -m64 -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2 --sysroot=$SDKTARGETSYSROOT"
export CXX="x86_64-poky-linux-g++  -v -m64 -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2 --sysroot=$SDKTARGETSYSROOT"
export CPP="x86_64-poky-linux-gcc -v -E  -m64 -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2 --sysroot=$SDKTARGETSYSROOT"
export AS="x86_64-poky-linux-as  "
export LD="x86_64-poky-linux-ld  --sysroot=$SDKTARGETSYSROOT"
export GDB=x86_64-poky-linux-gdb
export STRIP=x86_64-poky-linux-strip
export RANLIB=x86_64-poky-linux-ranlib
export OBJCOPY=x86_64-poky-linux-objcopy
export OBJDUMP=x86_64-poky-linux-objdump
export AR=x86_64-poky-linux-ar
export NM=x86_64-poky-linux-nm
export M4=m4
export TARGET_PREFIX=x86_64-poky-linux-
export CONFIGURE_FLAGS="--target=x86_64-poky-linux --host=x86_64-poky-linux --build=x86_64-linux --with-libtool-sysroot=$SDKTARGETSYSROOT"
export CFLAGS=" --sysroot=$SDKTARGETSYSROOT -O2 -pipe -g -feliminate-unused-debug-types"
export CXXFLAGS=" --sysroot=$SDKTARGETSYSROOT -O2 -pipe -g -feliminate-unused-debug-types"
export LDFLAGS=" -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed"
export CPPFLAGS=""
export KCFLAGS="--sysroot=$SDKTARGETSYSROOT"
export OECORE_DISTRO_VERSION="2.4.1"
export OECORE_SDK_VERSION="2.4.1"
export ARCH=x86
export CROSS_COMPILE=x86_64-poky-linux-

# Append environment subscripts
if [ -d "$OECORE_TARGET_SYSROOT/environment-setup.d" ]; then
    for envfile in $OECORE_TARGET_SYSROOT/environment-setup.d/*.sh; do
     . $envfile
    done
fi
if [ -d "$OECORE_NATIVE_SYSROOT/environment-setup.d" ]; then
    for envfile in $OECORE_NATIVE_SYSROOT/environment-setup.d/*.sh; do
     . $envfile
    done
fi
export CLANGCC="x86_64-poky-linux-clang -m64 -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2 -mlittle-endian --sysroot=$SDKTARGETSYSROOT"
export CLANGCXX="x86_64-poky-linux-clang++ -m64 -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2 -mlittle-endian --sysroot=$SDKTARGETSYSROOT"
export CLANGCPP="x86_64-poky-linux-clang -E -m64 -march=corei7 -mtune=corei7 -mfpmath=sse -msse4.2 -mlittle-endian --sysroot=$SDKTARGETSYSROOT"


 and