Determining if the CXX compiler works failed with the following output:
Change Dir: /tmp/instance-1/output-1/build/qpid-proton-0.33.0/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_a52fb/fast && make[1]: Entering directory '/tmp/instance-1/output-1/build/qpid-proton-0.33.0/CMakeFiles/CMakeTmp'
/usr/bin/make -f CMakeFiles/cmTC_a52fb.dir/build.make CMakeFiles/cmTC_a52fb.dir/build
make[2]: Entering directory '/tmp/instance-1/output-1/build/qpid-proton-0.33.0/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_a52fb.dir/testCXXCompiler.cxx.o
/usr/bin/c++ --sysroot=/tmp/instance-1/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot    -g   -o CMakeFiles/cmTC_a52fb.dir/testCXXCompiler.cxx.o -c /tmp/instance-1/output-1/build/qpid-proton-0.33.0/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTC_a52fb
/usr/bin/cmake -E cmake_link_script CMakeFiles/cmTC_a52fb.dir/link.txt --verbose=1
/usr/bin/c++ --sysroot=/tmp/instance-1/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot    -g    CMakeFiles/cmTC_a52fb.dir/testCXXCompiler.cxx.o  -o cmTC_a52fb 
/usr/bin/ld: skipping incompatible /tmp/instance-1/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot/lib/../lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /tmp/instance-1/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: skipping incompatible /tmp/instance-1/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot/lib/libgcc_s.so.1 when searching for libgcc_s.so.1
/usr/bin/ld: cannot find libgcc_s.so.1
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/cmTC_a52fb.dir/build.make:87: cmTC_a52fb] Error 1
make[2]: Leaving directory '/tmp/instance-1/output-1/build/qpid-proton-0.33.0/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:121: cmTC_a52fb/fast] Error 2
make[1]: Leaving directory '/tmp/instance-1/output-1/build/qpid-proton-0.33.0/CMakeFiles/CMakeTmp'