I just try to compile again - and got this:

build-debug$ sudo rm -Rf * && cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_COMPILER=clang++ -D CMAKE_C_COMPILER=clang -DCMAKE_CXX_FLAGS=-stdlib=libc++ -DLLVM_USE_LINKER=gold -G Ninja ../llvm-project/llvm -- The C compiler identification is Clang 10.0.0 -- The CXX compiler identification is Clang 10.0.0 -- The ASM compiler identification is Clang -- Found assembler: /usr/bin/clang -- Check for working C compiler: /usr/bin/clang -- Check for working C compiler: /usr/bin/clang -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /usr/bin/clang++ -- Check for working CXX compiler: /usr/bin/clang++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Performing Test LLVM_LIBSTDCXX_MIN -- Performing Test LLVM_LIBSTDCXX_MIN - Success -- Performing Test LLVM_LIBSTDCXX_SOFT_ERROR -- Performing Test LLVM_LIBSTDCXX_SOFT_ERROR - Success -- Looking for dlfcn.h -- Looking for dlfcn.h - found -- Looking for errno.h -- Looking for errno.h - found -- Looking for fcntl.h -- Looking for fcntl.h - found -- Looking for link.h -- Looking for link.h - found -- Looking for malloc/malloc.h -- Looking for malloc/malloc.h - not found -- Looking for pthread.h -- Looking for pthread.h - found -- Looking for signal.h -- Looking for signal.h - found -- Looking for sys/ioctl.h -- Looking for sys/ioctl.h - found -- Looking for sys/mman.h -- Looking for sys/mman.h - found -- Looking for sys/param.h -- Looking for sys/param.h - found -- Looking for sys/resource.h -- Looking for sys/resource.h - found -- Looking for sys/stat.h -- Looking for sys/stat.h - found -- Looking for sys/time.h -- Looking for sys/time.h - found -- Looking for sys/types.h -- Looking for sys/types.h - found -- Looking for termios.h -- Looking for termios.h - found -- Looking for unistd.h -- Looking for unistd.h - found -- Looking for valgrind/valgrind.h -- Looking for valgrind/valgrind.h - not found -- Looking for fenv.h -- Looking for fenv.h - found -- Looking for FE_ALL_EXCEPT -- Looking for FE_ALL_EXCEPT - found -- Looking for FE_INEXACT -- Looking for FE_INEXACT - found -- Looking for mach/mach.h -- Looking for mach/mach.h - not found -- Looking for histedit.h -- Looking for histedit.h - not found -- Looking for CrashReporterClient.h -- Looking for CrashReporterClient.h - not found -- Looking for linux/magic.h -- Looking for linux/magic.h - found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Looking for pthread_getspecific in pthread -- Looking for pthread_getspecific in pthread - found -- Looking for pthread_rwlock_init in pthread -- Looking for pthread_rwlock_init in pthread - found -- Looking for pthread_mutex_lock in pthread -- Looking for pthread_mutex_lock in pthread - found -- Looking for dlopen in dl -- Looking for dlopen in dl - found -- Looking for clock_gettime in rt -- Looking for clock_gettime in rt - found -- Looking for pfm_initialize in pfm -- Looking for pfm_initialize in pfm - not found -- Looking for pthread.h -- Looking for pthread.h - found -- Performing Test CMAKE_HAVE_LIBC_PTHREAD -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed -- Looking for pthread_create in pthreads -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Found Threads: TRUE
-- Looking for setupterm in terminfo -- Looking for setupterm in terminfo - not found -- Looking for setupterm in tinfo -- Looking for setupterm in tinfo - found -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11") -- Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR) -- Looking for xar_open in xar -- Looking for xar_open in xar - not found -- Looking for arc4random -- Looking for arc4random - not found -- Looking for backtrace -- Looking for backtrace - found -- backtrace facility detected in default set of libraries -- Found Backtrace: /usr/include
-- Performing Test C_SUPPORTS_WERROR_UNGUARDED_AVAILABILITY_NEW -- Performing Test C_SUPPORTS_WERROR_UNGUARDED_AVAILABILITY_NEW - Success -- Looking for _Unwind_Backtrace -- Looking for _Unwind_Backtrace - found -- Looking for getpagesize -- Looking for getpagesize - found -- Looking for sysconf -- Looking for sysconf - found -- Looking for getrusage -- Looking for getrusage - found -- Looking for setrlimit -- Looking for setrlimit - found -- Looking for isatty -- Looking for isatty - found -- Looking for futimens -- Looking for futimens - found -- Looking for futimes -- Looking for futimes - found -- Looking for posix_fallocate -- Looking for posix_fallocate - found -- Looking for sigaltstack -- Looking for sigaltstack - found -- Looking for lseek64 -- Looking for lseek64 - found -- Looking for mallctl -- Looking for mallctl - not found -- Looking for mallinfo -- Looking for mallinfo - found -- Looking for malloc_zone_statistics -- Looking for malloc_zone_statistics - not found -- Looking for getrlimit -- Looking for getrlimit - found -- Looking for posix_spawn -- Looking for posix_spawn - found -- Looking for pread -- Looking for pread - found -- Looking for sbrk -- Looking for sbrk - found -- Looking for strerror -- Looking for strerror - found -- Looking for strerror_r -- Looking for strerror_r - found -- Looking for strerror_s -- Looking for strerror_s - not found -- Looking for setenv -- Looking for setenv - found -- Looking for dlopen -- Looking for dlopen - found -- Looking for dladdr -- Looking for dladdr - not found -- Performing Test HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC -- Performing Test HAVE_STRUCT_STAT_ST_MTIMESPEC_TV_NSEC - Failed -- Performing Test HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC -- Performing Test HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC - Success -- Looking for GLIBC -- Looking for GLIBC - found -- Looking for pthread_getname_np -- Looking for pthread_getname_np - found -- Looking for pthread_setname_np -- Looking for pthread_setname_np - found -- Performing Test HAVE_STD_IS_TRIVIALLY_COPYABLE -- Performing Test HAVE_STD_IS_TRIVIALLY_COPYABLE - Success -- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB -- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Success -- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB -- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB - Success -- Performing Test LLVM_HAS_ATOMICS -- Performing Test LLVM_HAS_ATOMICS - Success -- Performing Test SUPPORTS_VARIADIC_MACROS_FLAG -- Performing Test SUPPORTS_VARIADIC_MACROS_FLAG - Success -- Performing Test SUPPORTS_GNU_ZERO_VARIADIC_MACRO_ARGUMENTS_FLAG -- Performing Test SUPPORTS_GNU_ZERO_VARIADIC_MACRO_ARGUMENTS_FLAG - Success -- Native target architecture is X86 -- Threads enabled. -- Doxygen disabled. -- Go bindings disabled. -- Ninja version: 1.10.0.git.kitware.jobserver-1 -- Could NOT find OCaml (missing: OCAMLFIND OCAML_VERSION OCAML_STDLIB_PATH) -- Could NOT find OCaml (missing: OCAMLFIND OCAML_VERSION OCAML_STDLIB_PATH) -- OCaml bindings disabled. -- Could NOT find Python module pygments -- Could NOT find Python module pygments.lexers.c_cpp -- Could NOT find Python module yaml -- LLVM host triple: x86_64-unknown-linux-gnu -- LLVM default target triple: x86_64-unknown-linux-gnu -- Performing Test CXX_SUPPORTS_CUSTOM_LINKER -- Performing Test CXX_SUPPORTS_CUSTOM_LINKER - Success -- Performing Test C_SUPPORTS_FPIC -- Performing Test C_SUPPORTS_FPIC - Success -- Performing Test CXX_SUPPORTS_FPIC -- Performing Test CXX_SUPPORTS_FPIC - Success -- Building with -fPIC -- Performing Test SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG -- Performing Test SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG - Success -- Performing Test C_SUPPORTS_WERROR_DATE_TIME -- Performing Test C_SUPPORTS_WERROR_DATE_TIME - Success -- Performing Test CXX_SUPPORTS_WERROR_DATE_TIME -- Performing Test CXX_SUPPORTS_WERROR_DATE_TIME - Success -- Performing Test CXX_SUPPORTS_WERROR_UNGUARDED_AVAILABILITY_NEW -- Performing Test CXX_SUPPORTS_WERROR_UNGUARDED_AVAILABILITY_NEW - Success -- Performing Test CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG -- Performing Test CXX_SUPPORTS_MISSING_FIELD_INITIALIZERS_FLAG - Success -- Performing Test C_SUPPORTS_IMPLICIT_FALLTHROUGH_FLAG -- Performing Test C_SUPPORTS_IMPLICIT_FALLTHROUGH_FLAG - Success -- Performing Test CXX_SUPPORTS_IMPLICIT_FALLTHROUGH_FLAG -- Performing Test CXX_SUPPORTS_IMPLICIT_FALLTHROUGH_FLAG - Success -- Performing Test C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG -- Performing Test C_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG - Success -- Performing Test CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG -- Performing Test CXX_SUPPORTS_COVERED_SWITCH_DEFAULT_FLAG - Success -- Performing Test CXX_SUPPORTS_CLASS_MEMACCESS_FLAG -- Performing Test CXX_SUPPORTS_CLASS_MEMACCESS_FLAG - Failed -- Performing Test CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG -- Performing Test CXX_SUPPORTS_NOEXCEPT_TYPE_FLAG - Success -- Performing Test CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR -- Performing Test CXX_WONT_WARN_ON_FINAL_NONVIRTUALDTOR - Success -- Performing Test C_SUPPORTS_DELETE_NON_VIRTUAL_DTOR_FLAG -- Performing Test C_SUPPORTS_DELETE_NON_VIRTUAL_DTOR_FLAG - Success -- Performing Test CXX_SUPPORTS_DELETE_NON_VIRTUAL_DTOR_FLAG -- Performing Test CXX_SUPPORTS_DELETE_NON_VIRTUAL_DTOR_FLAG - Success -- Performing Test CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG -- Performing Test CXX_SUPPORTS_SUGGEST_OVERRIDE_FLAG - Failed -- Performing Test C_WCOMMENT_ALLOWS_LINE_WRAP -- Performing Test C_WCOMMENT_ALLOWS_LINE_WRAP - Success -- Performing Test C_SUPPORTS_STRING_CONVERSION_FLAG -- Performing Test C_SUPPORTS_STRING_CONVERSION_FLAG - Success -- Performing Test CXX_SUPPORTS_STRING_CONVERSION_FLAG -- Performing Test CXX_SUPPORTS_STRING_CONVERSION_FLAG - Success -- Performing Test LINKER_SUPPORTS_COLOR_DIAGNOSTICS -- Performing Test LINKER_SUPPORTS_COLOR_DIAGNOSTICS - Failed -- Looking for os_signpost_interval_begin -- Looking for os_signpost_interval_begin - not found -- Found Python3: /usr/bin/python3.8 (found version "3.8.2") found components: Interpreter -- Constructing LLVMBuild project information -- Linker detection: GNU Gold -- Found Git: /usr/bin/git (found version "2.25.1") -- Targeting AArch64 -- Targeting AMDGPU -- Targeting ARM -- Targeting AVR -- Targeting BPF -- Targeting Hexagon -- Targeting Lanai -- Targeting Mips -- Targeting MSP430 -- Targeting NVPTX -- Targeting PowerPC -- Targeting RISCV -- Targeting Sparc -- Targeting SystemZ -- Targeting WebAssembly -- Targeting X86 -- Targeting XCore -- default linker set to "gold" -- Performing Test C_SUPPORTS_CF_PROTECTION_BRANCH -- Performing Test C_SUPPORTS_CF_PROTECTION_BRANCH - Success -- Performing Test SPLIT_STACK_FUNCTIONAL -- Performing Test SPLIT_STACK_FUNCTIONAL - Success -- starting libgo configuration. -- Performing Test HAVE_ATOMIC_FUNCTIONS -- Performing Test HAVE_ATOMIC_FUNCTIONS - Success -- Looking for clock_gettime -- Looking for clock_gettime - found -- Looking for strnlen -- Looking for strnlen - found -- Looking for dl_iterate_phdr -- Looking for dl_iterate_phdr - found -- Looking for fcntl -- Looking for fcntl - found -- Looking for getexecname -- Looking for getexecname - not found -- Looking for lstat -- Looking for lstat - found -- Looking for readlink -- Looking for readlink - found -- Looking for mmap -- Looking for mmap - found -- Looking for accept4 -- Looking for accept4 - found -- Looking for dup3 -- Looking for dup3 - found -- Looking for epoll_create1 -- Looking for epoll_create1 - found -- Looking for faccessat -- Looking for faccessat - found -- Looking for fallocate -- Looking for fallocate - found -- Looking for fchmodat -- Looking for fchmodat - found -- Looking for fchownat -- Looking for fchownat - found -- Looking for futimesat -- Looking for futimesat - found -- Looking for inotify_add_watch -- Looking for inotify_add_watch - found -- Looking for inotify_init -- Looking for inotify_init - found -- Looking for inotify_init1 -- Looking for inotify_init1 - found -- Looking for inotify_rm_watch -- Looking for inotify_rm_watch - found -- Looking for listxattr -- Looking for listxattr - found -- Looking for mincore -- Looking for mincore - found -- Looking for mkdirat -- Looking for mkdirat - found -- Looking for openat -- Looking for openat - found -- Looking for removexattr -- Looking for removexattr - found -- Looking for renameat -- Looking for renameat - found -- Looking for setxattr -- Looking for setxattr - found -- Looking for splice -- Looking for splice - found -- Looking for sync_file_range -- Looking for sync_file_range - found -- Looking for syscall -- Looking for syscall - found -- Looking for tee -- Looking for tee - found -- Looking for unlinkat -- Looking for unlinkat - found -- Looking for unsetenv -- Looking for unsetenv - found -- Looking for unshare -- Looking for unshare - found -- Looking for utimensat -- Looking for utimensat - found -- Looking for wait4 -- Looking for wait4 - found -- Looking for open64 -- Looking for open64 - found -- Looking for mknodat -- Looking for mknodat - found -- Looking for pipe2 -- Looking for pipe2 - found -- Looking for memmem -- Looking for memmem - found -- Looking for inttypes.h -- Looking for inttypes.h - found -- Looking for linux/ether.h -- Looking for linux/ether.h - not found -- Looking for linux/filter.h -- Looking for linux/filter.h - found -- Looking for linux/fs.h -- Looking for linux/fs.h - found -- Looking for linux/if_addr.h -- Looking for linux/if_addr.h - found -- Looking for linux/if_ether.h -- Looking for linux/if_ether.h - found -- Looking for linux/if_tun.h -- Looking for linux/if_tun.h - found -- Looking for linux/netlink.h -- Looking for linux/netlink.h - found -- Looking for linux/ptrace.h -- Looking for linux/ptrace.h - found -- Looking for linux/reboot.h -- Looking for linux/reboot.h - found -- Looking for linux/rtnetlink.h -- Looking for linux/rtnetlink.h - found -- Looking for memory.h -- Looking for memory.h - found -- Looking for net/if.h -- Looking for net/if.h - found -- Looking for net/if_arp.h -- Looking for net/if_arp.h - found -- Looking for net/route.h -- Looking for net/route.h - found -- Looking for netinet/icmp6.h -- Looking for netinet/icmp6.h - found -- Looking for netinet/if_ether.h -- Looking for netinet/if_ether.h - found -- Looking for netinet/in_systm.h -- Looking for netinet/in_systm.h - found -- Looking for netinet/ip.h -- Looking for netinet/ip.h - found -- Looking for netinet/ip_mroute.h -- Looking for netinet/ip_mroute.h - not found -- Looking for netpacket/packet.h -- Looking for netpacket/packet.h - found -- Looking for port.h -- Looking for port.h - not found -- Looking for sched.h -- Looking for sched.h - found -- Looking for semaphore.h -- Looking for semaphore.h - found -- Looking for stdint.h -- Looking for stdint.h - found -- Looking for stdlib.h -- Looking for stdlib.h - found -- Looking for strings.h -- Looking for strings.h - found -- Looking for sys/epoll.h -- Looking for sys/epoll.h - found -- Looking for sys/file.h -- Looking for sys/file.h - found -- Looking for sys/inotify.h -- Looking for sys/inotify.h - found -- Looking for sys/mount.h -- Looking for sys/mount.h - found -- Looking for sys/prctl.h -- Looking for sys/prctl.h - found -- Looking for sys/ptrace.h -- Looking for sys/ptrace.h - found -- Looking for sys/select.h -- Looking for sys/select.h - found -- Looking for sys/statfs.h -- Looking for sys/statfs.h - found -- Looking for sys/syscall.h -- Looking for sys/syscall.h - found -- Looking for sys/sysinfo.h -- Looking for sys/sysinfo.h - found -- Looking for sys/timex.h -- Looking for sys/timex.h - found -- Looking for sys/user.h -- Looking for sys/user.h - found -- Looking for sys/utsname.h -- Looking for sys/utsname.h - found -- Looking for sys/vfs.h -- Looking for sys/vfs.h - found -- Looking for syscall.h -- Looking for syscall.h - found -- Looking for utime.h -- Looking for utime.h - found -- Looking for compress in z -- Looking for compress in z - found -- Looking for stddef.h -- Looking for stddef.h - found -- Check size of double -- Check size of double - done -- Check size of long double -- Check size of long double - done -- Check size of long double -- Check size of long double - done -- Check size of void* -- Check size of void* - done -- Looking for alloca.h -- Looking for alloca.h - found -- Looking for alloca -- Looking for alloca - not found -- Looking for memcpy -- Looking for memcpy - found -- Performing Test HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4 -- Performing Test HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4 - Success -- Performing Test HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8 -- Performing Test HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8 - Success -- Performing Test HAVE_AS_X86_AES -- Performing Test HAVE_AS_X86_AES - Success -- Libgo: creating stdlib package targets -- Libgo: generating check targets -- libgo configuration complete. -- starting gotools configuration. -- gotools: generating check targets -- gotools configuration complete. -- Registering Bye as a pass plugin (static build: OFF) -- Failed to find LLVM FileCheck -- Version: 0.0.0 -- Performing Test HAVE_CXX_FLAG_STD_CXX11 -- Performing Test HAVE_CXX_FLAG_STD_CXX11 - Success -- Performing Test HAVE_CXX_FLAG_WALL -- Performing Test HAVE_CXX_FLAG_WALL - Success -- Performing Test HAVE_CXX_FLAG_WEXTRA -- Performing Test HAVE_CXX_FLAG_WEXTRA - Success -- Performing Test HAVE_CXX_FLAG_WSHADOW -- Performing Test HAVE_CXX_FLAG_WSHADOW - Success -- Performing Test HAVE_CXX_FLAG_PEDANTIC -- Performing Test HAVE_CXX_FLAG_PEDANTIC - Success -- Performing Test HAVE_CXX_FLAG_PEDANTIC_ERRORS -- Performing Test HAVE_CXX_FLAG_PEDANTIC_ERRORS - Success -- Performing Test HAVE_CXX_FLAG_WSHORTEN_64_TO_32 -- Performing Test HAVE_CXX_FLAG_WSHORTEN_64_TO_32 - Success -- Performing Test HAVE_CXX_FLAG_WFLOAT_EQUAL -- Performing Test HAVE_CXX_FLAG_WFLOAT_EQUAL - Success -- Performing Test HAVE_CXX_FLAG_FSTRICT_ALIASING -- Performing Test HAVE_CXX_FLAG_FSTRICT_ALIASING - Success -- Performing Test HAVE_CXX_FLAG_FNO_EXCEPTIONS -- Performing Test HAVE_CXX_FLAG_FNO_EXCEPTIONS - Success -- Performing Test HAVE_CXX_FLAG_WSTRICT_ALIASING -- Performing Test HAVE_CXX_FLAG_WSTRICT_ALIASING - Success -- Performing Test HAVE_CXX_FLAG_WD654 -- Performing Test HAVE_CXX_FLAG_WD654 - Failed -- Performing Test HAVE_CXX_FLAG_WTHREAD_SAFETY -- Performing Test HAVE_CXX_FLAG_WTHREAD_SAFETY - Success -- Performing Test HAVE_THREAD_SAFETY_ATTRIBUTES -- Performing Test HAVE_THREAD_SAFETY_ATTRIBUTES -- Performing Test HAVE_THREAD_SAFETY_ATTRIBUTES -- failed to compile -- Performing Test HAVE_CXX_FLAG_COVERAGE -- Performing Test HAVE_CXX_FLAG_COVERAGE - Success -- Performing Test HAVE_GNU_POSIX_REGEX -- Performing Test HAVE_GNU_POSIX_REGEX -- Performing Test HAVE_GNU_POSIX_REGEX -- failed to compile -- Performing Test HAVE_POSIX_REGEX -- Performing Test HAVE_POSIX_REGEX -- Performing Test HAVE_POSIX_REGEX -- success -- Performing Test HAVE_STEADY_CLOCK -- Performing Test HAVE_STEADY_CLOCK -- Performing Test HAVE_STEADY_CLOCK -- success -- Configuring done CMake Error at tools/gollvm/libgo/CMakeLists.txt:487 (add_library): Cannot find source file:

/home/ubuntu/workarea/llvm-project/llvm/tools/gollvm/gofrontend/libgo/go/golang.org/x/sys/cpu/cpu_gccgo.c

Tried extensions .c .C .c++ .cc .cpp .cxx .cu .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx

CMake Error at tools/gollvm/libgo/CMakeLists.txt:487 (add_library): No SOURCES given to target: libgo_c_piclib

CMake Error at tools/gollvm/libgo/CMakeLists.txt:496 (add_library): No SOURCES given to target: libgo_c_nonpiclib

CMake Generate step failed. Build files cannot be regenerated correctly.

I haven't encountered this issue before. Maybe there where some deletions, like in case of https://github.com/golang/go/issues/32381.

Ivan

@advancedwebdeveloper

if (NOT ${goarch} STREQUAL "arm64") list(APPEND runtimecfiles "go/golang.org/x/sys/cpu/cpu_gccgo_x86.go") endif()

should be

if (NOT ${goarch} STREQUAL "arm64") list(APPEND runtimecfiles "go/golang.org/x/sys/cpu/cpu_gccgo_x86.c") endif()

And it is recommended to build with an old version of llvm, the latest one may have synchronization problems. I use a61fa1a4b9d