Performing C++ SOURCE FILE Test CC_HAS_STACK_REALIGN failed with the following output:
Change Dir: /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/x265-2.7/source/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_9b265/fast"
gmake[1]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/x265-2.7/source/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTC_9b265.dir/build.make CMakeFiles/cmTC_9b265.dir/build
gmake[2]: Entering directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/x265-2.7/source/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_9b265.dir/src.cxx.o
/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/bin/arm-buildroot-linux-musleabihf-g++ --sysroot=/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/host/arm-buildroot-linux-musleabihf/sysroot    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -DCC_HAS_STACK_REALIGN  -DNDEBUG   -mstackrealign -o CMakeFiles/cmTC_9b265.dir/src.cxx.o -c /usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/x265-2.7/source/CMakeFiles/CMakeTmp/src.cxx
arm-buildroot-linux-musleabihf-g++.br_real: error: unrecognized command line option '-mstackrealign'
gmake[2]: *** [CMakeFiles/cmTC_9b265.dir/src.cxx.o] Error 1
gmake[2]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/x265-2.7/source/CMakeFiles/CMakeTmp'
gmake[1]: *** [cmTC_9b265/fast] Error 2
gmake[1]: Leaving directory `/usr/lfs/v0/rc-buildroot-test/scripts/instance-2/output/build/x265-2.7/source/CMakeFiles/CMakeTmp'

Source file was:
int main() { return 0; }