>>> mbedtls 2.28.0 Extracting
gzip -d -c /home/buildroot/autobuild/instance-3/dl/mbedtls/mbedtls-2.28.0.tar.gz | tar --strip-components=1 -C /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0   -xf -
>>> mbedtls 2.28.0 Patching

Applying 0001-bn_mul.h-fix-x86-PIC-inline-ASM-compilation-with-GCC.patch using patch: 
patching file include/mbedtls/bn_mul.h
Hunk #1 succeeded at 94 (offset 44 lines).
/bin/sed -i -e "s://#define MBEDTLS_THREADING_C:#define MBEDTLS_THREADING_C:" /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h
/bin/sed -i -e "s://#define MBEDTLS_THREADING_PTHREAD:#define MBEDTLS_THREADING_PTHREAD:" /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h
>>> mbedtls 2.28.0 Configuring
(mkdir -p /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/ && cd /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/ && rm -f CMakeCache.txt && PATH="/home/buildroot/autobuild/instance-3/output-1/host/bin:/home/buildroot/autobuild/instance-3/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"  /home/buildroot/autobuild/instance-3/output-1/host/bin/cmake /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/ -DCMAKE_TOOLCHAIN_FILE="/home/buildroot/autobuild/instance-3/output-1/host/share/buildroot/toolchainfile.cmake" -DCMAKE_INSTALL_PREFIX="/usr" -DCMAKE_COLOR_MAKEFILE=OFF -DBUILD_DOC=OFF -DBUILD_DOCS=OFF -DBUILD_EXAMPLE=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TEST=OFF -DBUILD_TESTS=OFF -DBUILD_TESTING=OFF -DBUILD_SHARED_LIBS=ON  -DENABLE_PROGRAMS=OFF -DENABLE_TESTING=OFF -DMBEDTLS_FATAL_WARNINGS=OFF -DUSE_SHARED_MBEDTLS_LIBRARY=ON -DUSE_STATIC_MBEDTLS_LIBRARY=OFF -DENABLE_ZLIB_SUPPORT=OFF )
-- The C compiler identification is GNU 4.8.3
-- Check for working C compiler: /home/buildroot/autobuild/instance-3/output-1/host/bin/arm-none-linux-gnueabi-gcc
-- Check for working C compiler: /home/buildroot/autobuild/instance-3/output-1/host/bin/arm-none-linux-gnueabi-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found Python3: /usr/bin/python3.5 (found version "3.5.3") found components: Interpreter 
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    BUILD_DOC
    BUILD_DOCS
    BUILD_EXAMPLE
    BUILD_EXAMPLES
    BUILD_TEST
    BUILD_TESTING
    BUILD_TESTS


-- Build files have been written to: /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0
>>> mbedtls 2.28.0 Building
PATH="/home/buildroot/autobuild/instance-3/output-1/host/bin:/home/buildroot/autobuild/instance-3/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"  /usr/bin/make -j4  -C /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/
make[1]: Entering directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
make[2]: Entering directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
make[3]: Entering directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
Scanning dependencies of target mbedcrypto
make[3]: Leaving directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
make[3]: Entering directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
[  2%] Building C object library/CMakeFiles/mbedcrypto.dir/aes.c.o
[  2%] Building C object library/CMakeFiles/mbedcrypto.dir/arc4.c.o
[  3%] Building C object library/CMakeFiles/mbedcrypto.dir/aria.c.o
[  4%] Building C object library/CMakeFiles/mbedcrypto.dir/aesni.c.o
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/arc4.c:25:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/aes.c:26:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/aria.c:26:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/aesni.c:25:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
[  5%] Building C object library/CMakeFiles/mbedcrypto.dir/asn1parse.c.o
[  6%] Building C object library/CMakeFiles/mbedcrypto.dir/asn1write.c.o
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/asn1parse.c:20:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/asn1write.c:20:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
[  7%] Building C object library/CMakeFiles/mbedcrypto.dir/base64.c.o
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/base64.c:20:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
[  8%] Building C object library/CMakeFiles/mbedcrypto.dir/bignum.c.o
[  9%] Building C object library/CMakeFiles/mbedcrypto.dir/blowfish.c.o
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/bignum.c:36:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/blowfish.c:26:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
[ 10%] Building C object library/CMakeFiles/mbedcrypto.dir/camellia.c.o
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/camellia.c:26:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
[ 11%] Building C object library/CMakeFiles/mbedcrypto.dir/ccm.c.o
/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/bignum.c: In function 'mpi_select':
/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/bignum.c:1994:5: error: 'for' loop initial declarations are only allowed in C99 mode
     for( size_t i = 0; i < T_size; i++ )
     ^
/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/bignum.c:1994:5: note: use option -std=c99 or -std=gnu99 to compile your code
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/ccm.c:29:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
library/CMakeFiles/mbedcrypto.dir/build.make:156: recipe for target 'library/CMakeFiles/mbedcrypto.dir/bignum.c.o' failed
make[3]: *** [library/CMakeFiles/mbedcrypto.dir/bignum.c.o] Error 1
make[3]: *** Waiting for unfinished jobs....
[ 12%] Building C object library/CMakeFiles/mbedcrypto.dir/chacha20.c.o
In file included from /home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/limits.h:25:0,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:168,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/syslimits.h:7,
                 from /home/buildroot/autobuild/instance-3/output-1/host/opt/ext-toolchain/lib/gcc/arm-none-linux-gnueabi/4.8.3/include-fixed/limits.h:34,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/check_config.h:35,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/include/mbedtls/config.h:4020,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/common.h:29,
                 from /home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/library/chacha20.c:24:
/home/buildroot/autobuild/instance-3/output-1/host/arm-buildroot-linux-gnueabi/sysroot/usr/include/features.h:327:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
make[3]: Leaving directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
CMakeFiles/Makefile2:171: recipe for target 'library/CMakeFiles/mbedcrypto.dir/all' failed
make[2]: *** [library/CMakeFiles/mbedcrypto.dir/all] Error 2
make[2]: Leaving directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
Makefile:132: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0'
package/pkg-generic.mk:292: recipe for target '/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/.stamp_built' failed
make: *** [/home/buildroot/autobuild/instance-3/output-1/build/mbedtls-2.28.0/.stamp_built] Error 2
make: Leaving directory '/home/buildroot/autobuild/instance-3/buildroot'