The target system is: Buildroot - 1 - armv7l The host system is: Linux - 5.4.0-80-generic - x86_64 Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded. Compiler: /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc Build flags: -D_LARGEFILE_SOURCE;-D_LARGEFILE64_SOURCE;-D_FILE_OFFSET_BITS=64;-Os;-g0;-D_FORTIFY_SOURCE=1 Id flags: The output was: 0 Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out" The C compiler identification is GNU, found in "/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/3.16.9/CompilerIdC/a.out" Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded. 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'/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' Determining if files stdbool.h exist passed with the following output: Change Dir: /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_77dcf/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_77dcf.dir/build.make CMakeFiles/cmTC_77dcf.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_77dcf.dir/HAVE_STDBOOL_H.c.o /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Werror -Werror -DNDEBUG -fPIE -o CMakeFiles/cmTC_77dcf.dir/HAVE_STDBOOL_H.c.o -c /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CheckIncludeFiles/HAVE_STDBOOL_H.c Linking C executable cmTC_77dcf /tmp/instance-0/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_77dcf.dir/link.txt --verbose=1 /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Werror -Werror -DNDEBUG CMakeFiles/cmTC_77dcf.dir/HAVE_STDBOOL_H.c.o -o cmTC_77dcf make[2]: Leaving directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' make[1]: Leaving directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' Determining if the __arm__ exist passed with the following output: Change Dir: /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_d58b2/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_d58b2.dir/build.make CMakeFiles/cmTC_d58b2.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' Building C object CMakeFiles/cmTC_d58b2.dir/CheckSymbolExists.c.o /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_POSIX_C_SOURCE=200112L -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Werror -Werror -DNDEBUG -fPIE -o CMakeFiles/cmTC_d58b2.dir/CheckSymbolExists.c.o -c /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp/CheckSymbolExists.c Linking C executable cmTC_d58b2 /tmp/instance-0/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_d58b2.dir/link.txt --verbose=1 /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-gcc --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -D_POSIX_C_SOURCE=200112L -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Werror -Werror -DNDEBUG CMakeFiles/cmTC_d58b2.dir/CheckSymbolExists.c.o -o cmTC_d58b2 make[2]: Leaving directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' make[1]: Leaving directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' File /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp/CheckSymbolExists.c: /* */ int main(int argc, char** argv) { (void)argv; #ifndef __arm__ return ((int*)(&__arm__))[argc]; #else (void)argc; return 0; #endif } Performing C++ SOURCE FILE Test CXX_FLAG_CXX11 succeeded with the following output: Change Dir: /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp Run Build Command(s):/usr/bin/make cmTC_56abd/fast && make[1]: Entering directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' /usr/bin/make -f CMakeFiles/cmTC_56abd.dir/build.make CMakeFiles/cmTC_56abd.dir/build make[2]: Entering directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' Building CXX object CMakeFiles/cmTC_56abd.dir/src.cxx.o /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-g++ --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Werror -Werror -DCXX_FLAG_CXX11 -DNDEBUG -fPIE -std=c++11 -o CMakeFiles/cmTC_56abd.dir/src.cxx.o -c /tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp/src.cxx Linking CXX executable cmTC_56abd /tmp/instance-0/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_56abd.dir/link.txt --verbose=1 /tmp/instance-0/output-1/host/bin/arm-buildroot-linux-gnueabihf-g++ --sysroot=/tmp/instance-0/output-1/host/arm-buildroot-linux-gnueabihf/sysroot -fPIC -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -g0 -D_FORTIFY_SOURCE=1 -Werror -Werror -DCXX_FLAG_CXX11 -DNDEBUG CMakeFiles/cmTC_56abd.dir/src.cxx.o -o cmTC_56abd make[2]: Leaving directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' make[1]: Leaving directory '/tmp/instance-0/output-1/build/azure-iot-sdk-c-LTS_01_2021_Ref01/CMakeFiles/CMakeTmp' Source file was: int main() { return 0; }