Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" failed.
Compiler: /usr/bin/clang++ 
Build flags: 
Id flags:  

The output was:
1
/usr/bin/ld: cannot find -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)


Detecting CXX compiler ABI info failed to compile with the following output:
Change Dir: /nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_2fcf2/fast && make[1]: Entering directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_2fcf2.dir/build.make CMakeFiles/cmTC_2fcf2.dir/build
make[2]: Entering directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_2fcf2.dir/CMakeCXXCompilerABI.cpp.o
/usr/bin/clang++ --sysroot=/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot   -O3 -DNDEBUG   -v -o CMakeFiles/cmTC_2fcf2.dir/CMakeCXXCompilerABI.cpp.o -c /nvmedata/autobuild/instance-11/output-1/host/share/cmake-3.18/Modules/CMakeCXXCompilerABI.cpp
clang version 10.0.0-4ubuntu1 
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/usr/lib/llvm-10/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-obj -disable-free -disable-llvm-verifier -discard-value-names -main-file-name CMakeCXXCompilerABI.cpp -mrelocation-model static -mthread-model posix -mframe-pointer=none -fmath-errno -fno-rounding-math -masm-verbose -mconstructor-aliases -munwind-tables -target-cpu x86-64 -dwarf-column-info -fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir /usr/lib/llvm-10/lib/clang/10.0.0 -D NDEBUG -isysroot /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++ -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/x86_64-linux-gnu -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/backward -internal-isystem /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/usr/local/include -internal-isystem /usr/lib/llvm-10/lib/clang/10.0.0/include -internal-externc-isystem /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/include -internal-externc-isystem /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/usr/include -O3 -fdeprecated-macro -fdebug-compilation-dir /nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp -ferror-limit 19 -fmessage-length 0 -fgnuc-version=4.2.1 -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -vectorize-loops -vectorize-slp -faddrsig -o CMakeFiles/cmTC_2fcf2.dir/CMakeCXXCompilerABI.cpp.o -x c++ /nvmedata/autobuild/instance-11/output-1/host/share/cmake-3.18/Modules/CMakeCXXCompilerABI.cpp
clang -cc1 version 10.0.0 based upon LLVM 10.0.0 default target x86_64-pc-linux-gnu
ignoring nonexistent directory "/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/backward"
ignoring nonexistent directory "/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/usr/local/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/bin/../lib/gcc/x86_64-linux-gnu/10/../../../../include/c++
 /usr/lib/llvm-10/lib/clang/10.0.0/include
 /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/include
 /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/usr/include
End of search list.
Linking CXX executable cmTC_2fcf2
/nvmedata/autobuild/instance-11/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_2fcf2.dir/link.txt --verbose=1
/usr/bin/clang++ --sysroot=/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot -O3 -DNDEBUG  -v CMakeFiles/cmTC_2fcf2.dir/CMakeCXXCompilerABI.cpp.o -o cmTC_2fcf2 
clang version 10.0.0-4ubuntu1 
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/usr/bin/ld" --sysroot=/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot -z relro --hash-style=gnu --build-id --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o cmTC_2fcf2 /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/lib/../lib64/crt1.o /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/lib/../lib64/crti.o /usr/bin/../lib/gcc/x86_64-linux-gnu/10/crtbegin.o -L/usr/bin/../lib/gcc/x86_64-linux-gnu/10 -L/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/lib/../lib64 -L/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/usr/lib/../lib64 -L/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/lib -L/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/usr/lib CMakeFiles/cmTC_2fcf2.dir/CMakeCXXCompilerABI.cpp.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/bin/../lib/gcc/x86_64-linux-gnu/10/crtend.o /nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot/lib/../lib64/crtn.o
/usr/bin/ld: cannot find -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [CMakeFiles/cmTC_2fcf2.dir/build.make:106: cmTC_2fcf2] Error 1
make[2]: Leaving directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:140: cmTC_2fcf2/fast] Error 2
make[1]: Leaving directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'




Determining if the CXX compiler works failed with the following output:
Change Dir: /nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_c3644/fast && make[1]: Entering directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'
/usr/bin/make  -f CMakeFiles/cmTC_c3644.dir/build.make CMakeFiles/cmTC_c3644.dir/build
make[2]: Entering directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_c3644.dir/testCXXCompiler.cxx.o
/usr/bin/clang++ --sysroot=/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot   -O3 -DNDEBUG -o CMakeFiles/cmTC_c3644.dir/testCXXCompiler.cxx.o -c /nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTC_c3644
/nvmedata/autobuild/instance-11/output-1/host/bin/cmake -E cmake_link_script CMakeFiles/cmTC_c3644.dir/link.txt --verbose=1
/usr/bin/clang++ --sysroot=/nvmedata/autobuild/instance-11/output-1/host/x86_64-buildroot-linux-musl/sysroot -O3 -DNDEBUG CMakeFiles/cmTC_c3644.dir/testCXXCompiler.cxx.o -o cmTC_c3644 
/usr/bin/ld: cannot find -lstdc++
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [CMakeFiles/cmTC_c3644.dir/build.make:106: cmTC_c3644] Error 1
make[2]: Leaving directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'
make[1]: *** [Makefile:140: cmTC_c3644/fast] Error 2
make[1]: Leaving directory '/nvmedata/autobuild/instance-11/output-1/build/libwebsockets-4.3.1/CMakeFiles/CMakeTmp'