Determining if the C compiler works failed with the following output:
Change Dir: /home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/build/bcg729-1.0.4/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_36d71/fast"
make[1]: Entering directory '/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/build/bcg729-1.0.4/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_36d71.dir/build.make CMakeFiles/cmTC_36d71.dir/build
make[2]: Entering directory '/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/build/bcg729-1.0.4/CMakeFiles/CMakeTmp'
Building C object CMakeFiles/cmTC_36d71.dir/testCCompiler.c.o
/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/host/bin/arm-linux-gcc --sysroot=/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot   -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -Wl,-elf2flt -static   -DNDEBUG   -o CMakeFiles/cmTC_36d71.dir/testCCompiler.c.o   -c /home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/build/bcg729-1.0.4/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTC_36d71
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_36d71.dir/link.txt --verbose=1
/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/host/bin/arm-linux-gcc --sysroot=/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -Wl,-elf2flt -static   -DNDEBUG  -Wl,-elf2flt -static  -rdynamic CMakeFiles/cmTC_36d71.dir/testCCompiler.c.o  -o cmTC_36d71 
arm-linux-gcc.br_real: error: unrecognized command line option '-rdynamic'
CMakeFiles/cmTC_36d71.dir/build.make:97: recipe for target 'cmTC_36d71' failed
make[2]: *** [cmTC_36d71] Error 1
make[2]: Leaving directory '/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/build/bcg729-1.0.4/CMakeFiles/CMakeTmp'
Makefile:126: recipe for target 'cmTC_36d71/fast' failed
make[1]: *** [cmTC_36d71/fast] Error 2
make[1]: Leaving directory '/home/rclinux/rc-buildroot-test/scripts/instance-0/output-1/build/bcg729-1.0.4/CMakeFiles/CMakeTmp'