>>> gmp 6.2.1 Extracting
xzcat /home/autobuild/autobuild/instance-3/dl/gmp/gmp-6.2.1.tar.xz | tar --strip-components=1 -C /home/autobuild/autobuild/instance-3/output-1/build/gmp-6.2.1   -xf -
>>> gmp 6.2.1 Patching

Applying 0001-mpz-inp_raw.c-Avoid-bit-size-overflows.patch using patch: 
patching file mpz/inp_raw.c
>>> gmp 6.2.1 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /home/autobuild/autobuild/instance-3/output-1/build/gmp-6.2.1 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> gmp 6.2.1 Patching libtool
patching file /home/autobuild/autobuild/instance-3/output-1/build/gmp-6.2.1/ltmain.sh
Hunk #1 succeeded at 2694 (offset 7 lines).
Hunk #2 succeeded at 4284 (offset 7 lines).
Hunk #3 succeeded at 6579 (offset 25 lines).
Hunk #4 succeeded at 6589 (offset 25 lines).
Hunk #5 succeeded at 6882 (offset 25 lines).
Hunk #6 succeeded at 7174 (offset 25 lines).
Hunk #7 succeeded at 8140 (offset 28 lines).
Hunk #8 succeeded at 10769 (offset 59 lines).
>>> gmp 6.2.1 Configuring
(cd /home/autobuild/autobuild/instance-3/output-1/build/gmp-6.2.1/ && rm -rf config.cache && PATH="/home/autobuild/autobuild/instance-3/output-1/host/bin:/home/autobuild/autobuild/instance-3/output-1/host/sbin:/home/autobuild/make:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" AR="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc-ar" AS="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-as" LD="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-ld" NM="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc-nm" CC="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc" GCC="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc" CPP="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-cpp" CXX="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-g++" FC="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gfortran" F77="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gfortran" RANLIB="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc-ranlib" READELF="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-readelf" STRIP="/bin/true" OBJCOPY="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-objcopy" OBJDUMP="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-objdump" AR_FOR_BUILD="/usr/bin/ar" AS_FOR_BUILD="/usr/bin/as" CC_FOR_BUILD="/usr/bin/gcc" GCC_FOR_BUILD="/usr/bin/gcc" CXX_FOR_BUILD="/usr/bin/g++" LD_FOR_BUILD="/usr/bin/ld" CPPFLAGS_FOR_BUILD="-I/home/autobuild/autobuild/instance-3/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/home/autobuild/autobuild/instance-3/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/home/autobuild/autobuild/instance-3/output-1/host/include" LDFLAGS_FOR_BUILD="-L/home/autobuild/autobuild/instance-3/output-1/host/lib -Wl,-rpath,/home/autobuild/autobuild/instance-3/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-as" DEFAULT_LINKER="/home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-ld" CPPFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64" CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0  -fPIC  -Wl,-elf2flt=-r -static" CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0  -fPIC  -Wl,-elf2flt=-r -static  -Wl,-elf2flt=-r -static" LDFLAGS="  -Wl,-elf2flt=-r -static" FCFLAGS=" -Os -g0  -Wl,-elf2flt=-r -static" FFLAGS=" -Os -g0  -Wl,-elf2flt=-r -static" PKG_CONFIG="/home/autobuild/autobuild/instance-3/output-1/host/bin/pkg-config" STAGING_DIR="/home/autobuild/autobuild/instance-3/output-1/host/riscv64-buildroot-linux-uclibc/sysroot" INTLTOOL_PERL=/usr/bin/perl ac_cv_lbl_unaligned_fail=yes ac_cv_func_mmap_fixed_mapped=yes ac_cv_func_memcmp_working=yes ac_cv_have_decl_malloc=yes gl_cv_func_malloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes ac_cv_func_calloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes lt_cv_sys_lib_search_path_spec="" ac_cv_c_bigendian=no   CONFIG_SITE=/dev/null ./configure --target=riscv64-buildroot-linux-uclibc --host=riscv64-buildroot-linux-uclibc --build=x86_64-pc-linux-gnu --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --localstatedir=/var --program-prefix="" --disable-gtk-doc --disable-gtk-doc-html --disable-doc --disable-docs --disable-documentation --with-xmlto=no --with-fop=no --disable-dependency-tracking --enable-ipv6 --disable-nls --enable-static --disable-shared  --disable-assembly --enable-cxx )
configure: WARNING: unrecognized options: --disable-gtk-doc, --disable-gtk-doc-html, --disable-doc, --disable-docs, --disable-documentation, --with-xmlto, --with-fop, --disable-dependency-tracking, --enable-ipv6, --disable-nls
checking build system type... x86_64-pc-linux-gnu
checking host system type... riscv64-buildroot-linux-uclibc
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for riscv64-buildroot-linux-uclibc-strip... /bin/true
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking ABI=standard
checking whether /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc is gcc... yes
checking compiler /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0  -fPIC  -Wl,-elf2flt=-r -static -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64... yes
checking for riscv64-buildroot-linux-uclibc-gcc... /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc accepts -g... yes
checking for /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO C89... none needed
checking whether /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc understands -c and -o together... yes
checking for /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO C99... unsupported
checking how to run the C preprocessor... /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-cpp
checking build system compiler /usr/bin/gcc... yes
checking for build system preprocessor... /usr/bin/gcc -E
checking for build system executable suffix... 
checking whether build system compiler is ANSI... yes
checking for build system compiler math library... -lm
checking whether we are using the GNU C++ compiler... yes
checking whether /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-g++ accepts -g... yes
checking C++ compiler /home/autobuild/autobuild/instance-3/output-1/host/bin/riscv64-buildroot-linux-uclibc-g++ -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os -g0  -fPIC  -Wl,-elf2flt=-r -static  -Wl,-elf2flt=-r -static... no, std iostream
configure: error: C++ compiler not available, see config.log for details
make: *** [package/pkg-generic.mk:283: /home/autobuild/autobuild/instance-3/output-1/build/gmp-6.2.1/.stamp_configured] Error 1
make: Leaving directory '/home/autobuild/autobuild/instance-3/buildroot'