https://drive.google.com/file/d/1QTUYIyq6QrtGxXrVGYIZFHVHncoYpHWy/view?usp=sharing - that's my compressed build folder.

gollvm_riscv_cmake_bugs.zip

I have a typo:

$ cmake -DCMAME_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLLVM_USE_LINKER=ld -DGOLLVM_DEFAULT_LINKER=ld -G Ninja ../llv
m-project/llvm

Re-checking after correction.

I see a recurrent errors, within nearly each CMake's check:

cc: error: unrecognized command-line option ‘-fuse-ld=ld’; did you mean ‘-fuse-ld=lld’?
ninja: build stopped: subcommand failed.
. It is expect to work only with Clang (as far as I remember).
It can't explain some other errors (especially for libffi).

I have fixed CMake's flags - and now it looks pretty weird:

$cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLLVM_USE_LINKER=lld -DGOLLVM_DEFAULT_LINKER=lld -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
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- No build type selected, default to Debug
-- 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 sysexits.h
-- Looking for sysexits.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 - 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
-- Found ZLIB: /usr/lib64/libz.so (found version "1.2.11")
-- Looking for compress2
-- Looking for compress2 - found
-- Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
-- Looking for el_init in edit
-- Looking for el_init in edit - found
-- 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 __register_frame
-- Looking for __register_frame - found
-- Looking for __deregister_frame
-- Looking for __deregister_frame - found
-- 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 RISCV
-- 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: riscv64-unknown-linux-gnu
-- LLVM default target triple: riscv64-unknown-linux-gnu
-- Performing Test CXX_SUPPORTS_CUSTOM_LINKER
-- Performing Test CXX_SUPPORTS_CUSTOM_LINKER - Failed
CMake Error at cmake/modules/HandleLLVMOptions.cmake:282 (message):
Host compiler does not support '-fuse-ld=lld'
Call Stack (most recent call first):
CMakeLists.txt:700 (include)

I didn't get it: why most of the checks are performed by "cc", instead of Clang?

Source file was:
int main(void) { return 0; }
Performing C SOURCE FILE Test C_SUPPORTS_IMPLICIT_FALLTHROUGH_FLAG failed with the following output:
Change Dir: /home/oceanfish81/workarea/build_riscv_release/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/local/bin/ninja cmTC_2981c && [1/2] Building C object CMakeFiles/cmTC_2981c.dir/src.c.o
[2/2] Linking C executable cmTC_2981c
FAILED: cmTC_2981c
: && /usr/bin/cc -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wmissing-field-initializers -pedantic -Wno-long-long -DC_SUPPORTS_IMPLICIT_FALLTHROUGH_FLAG -fuse-ld=ld CMakeFiles/cmTC_2981c.dir/src.c.o -o cmTC_2981c -lm && :
cc: error: unrecognized command-line option '-fuse-ld=ld'; did you mean '-fuse-ld=lld'?
ninja: build stopped: subcommand failed.

And since when Clang 10 don't recognize "-fuse-ld=lld" ?

Run Build Command(s):/usr/local/bin/ninja cmTC_013a3 && [1/2] Building CXX object CMakeFiles/cmTC_013a3.dir/src.cxx.o
clang-10: warning: argument unused during compilation: '-fuse-ld=lld' [-Wunused-command-line-argument]
[2/2] Linking CXX executable cmTC_013a3
FAILED: cmTC_013a3
: && /usr/bin/clang++ -DCXX_SUPPORTS_CUSTOM_LINKER -Werror=unguarded-availability-new -fuse-ld=lld CMakeFiles/cmTC_013a3.dir/src.cxx.o -o cmTC_013a3 -lm && :
ld.lld: error: /usr/bin/../lib/gcc/riscv64-redhat-linux/10/../../../../lib64/crt1.o:(.text+0x0): relocation R_RISCV_ALIGN requires unimplemented linker relaxation; recompile with -mno-relax
ld.lld: error: src.cxx:(.text+0x0): relocation R_RISCV_ALIGN requires unimplemented linker relaxation; recompile with -mno-relax
ld.lld: /builddir/build/BUILD/lld-10.0.0.src/ELF/Relocations.cpp:987: uint64_t lld::elf::{anonymous}::OffsetGetter::get(uint64_t): Assertion `pieces[i].inputOff <= off && "Relocation not in any piece"' failed.
Stack dump:
0. Program arguments: /usr/bin/ld.lld --hash-style=gnu --build-id --eh-frame-hdr -m elf64lriscv -dynamic-linker /lib/ld-linux-riscv64-lp64d.so.1 -o cmTC_013a3 /usr/bin/../lib/gcc/riscv64-redhat-linux/10/../../../../lib64/crt1.o /usr/bin/../lib/gcc/riscv64-redhat-linux/10/crti.o /usr/bin/../lib/gcc/riscv64-redhat-linux/10/crtbegin.o -L/usr/bin/../lib/gcc/riscv64-redhat-linux/10 -L/usr/bin/../lib/gcc/riscv64-redhat-linux/10/../../../../lib64 -L/usr/bin/../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/lib64/lp64d -L/usr/lib64/lp64d -L/usr/bin/../lib/gcc/riscv64-redhat-linux/10/../../.. -L/usr/bin/../lib -L/lib -L/usr/lib CMakeFiles/cmTC_013a3.dir/src.cxx.o -lm -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/bin/../lib/gcc/riscv64-redhat-linux/10/crtend.o /usr/bin/../lib/gcc/riscv64-redhat-linux/10/crtn.o
#0 0x0000003fe68eeeda llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/lib64/lp64d/libLLVM-10.so+0x966eda)
#1 0x0000003fe68ed9fc llvm::sys::RunSignalHandlers() (/lib64/lp64d/libLLVM-10.so+0x9659fc)
#2 0x0000003fe68edba0 (/lib64/lp64d/libLLVM-10.so+0x965ba0)
#3 0x0000003fea728800 (linux-vdso.so.1+0x800)
#4 0x0000003fe5ce21c4 raise (/lib64/lp64d/libc.so.6+0x331c4)
#5 0x0000003fe5cd272c abort (/lib64/lp64d/libc.so.6+0x2372c)
#6 0x0000003fe5cdcc82 __assert_fail_base (/lib64/lp64d/libc.so.6+0x2dc82)
#7 0x0000003fe5cdccd6 __assert_perror_fail (/lib64/lp64d/libc.so.6+0x2dcd6)
#8 0x0000003fea5c3092 (/lib64/lp64d/liblldELF.so.10+0x12a092)
#9 0x0000003fea5d809a void lld::elf::scanRelocations<llvm::object::ELFType<(llvm::support::endianness)1, true> >(lld::elf::InputSectionBase&) (/lib64/lp64d/liblldELF.so.10+0x13f09a)
#10 0x0000003fea64bb7e (/lib64/lp64d/liblldELF.so.10+0x1b2b7e)
#11 0x0000003fea66f51e (/lib64/lp64d/liblldELF.so.10+0x1d651e)
#12 0x0000003fea670504 void lld::elf::writeResult<llvm::object::ELFType<(llvm::support::endianness)1, true> >() (/lib64/lp64d/liblldELF.so.10+0x1d7504)
#13 0x0000003fea54b37e void lld::elf::LinkerDriver::link<llvm::object::ELFType<(llvm::support::endianness)1, true> >(llvm::opt::InputArgList&) (/lib64/lp64d/liblldELF.so.10+0xb237e)
#14 0x0000003fea50cfc8 lld::elf::LinkerDriver::main(llvm::ArrayRef<char const*>) (/lib64/lp64d/liblldELF.so.10+0x73fc8)
#15 0x0000003fea54d3b6 lld::elf::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&, llvm::raw_ostream&) (/lib64/lp64d/liblldELF.so.10+0xb43b6)
#16 0x0000002ac5be8a86 main (/usr/bin/ld.lld+0x1a86)
#17 0x0000003fe5cd2926 __libc_start_main (/lib64/lp64d/libc.so.6+0x23926)
#18 0x0000002ac5be8dc4 (/usr/bin/ld.lld+0x1dc4)

As for the bfd linker - I got this:

$cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLLVM_USE_LINKER=bfd -DGOLLVM_DEFAULT_LINKER=bfd -G Ninja ../llvm-project/llvm
-- Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)

-- Native target architecture is RISCV
-- 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.
-- LLVM host triple: riscv64-unknown-linux-gnu
-- LLVM default target triple: riscv64-unknown-linux-gnu
CMake Error at cmake/modules/HandleLLVMOptions.cmake:282 (message):
Host compiler does not support '-fuse-ld=bfd'
Call Stack (most recent call first):
CMakeLists.txt:700 (include)

$cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLLVM_USE_LINKER=ld.bfd -DGOLLVM_DEFAULT_LINKER=ld.bfd -G Ninja ../llvm-project/llvm
-- Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
-- Native target architecture is RISCV
-- 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.
-- LLVM host triple: riscv64-unknown-linux-gnu
-- LLVM default target triple: riscv64-unknown-linux-gnu
CMake Error at cmake/modules/HandleLLVMOptions.cmake:282 (message):
Host compiler does not support '-fuse-ld=ld.bfd'
Call Stack (most recent call first):
CMakeLists.txt:700 (include)

I have

$ clang --version
clang version 10.0.0 (Fedora 10.0.0-1.0.riscv64.fc33)
Target: riscv64-unknown-linux-gnu
Thread model: posix

and

$ ld.bfd --version
GNU ld version 2.35-10.fc33

clang-10: warning: argument unused during compilation: '-fuse-ld=ld.bfd' [-Wunused-command-line-argument]
[2/2] Linking CXX executable cmTC_67f08
FAILED: cmTC_67f08
: && /usr/bin/clang++ -DCXX_SUPPORTS_CUSTOM_LINKER -Werror=unguarded-availability-new -fuse-ld=ld.bfd CMakeFiles/cmTC_67f08.dir/src.cxx.o -o cmTC_67f08 -lm && :
clang-10: error: invalid linker name in argument '-fuse-ld=ld.bfd'
ninja: build stopped: subcommand failed.

I have some progress:

$cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_CXX_FLAGS=' -mno-relax ' -DLLVM_USE_LINKER=ld -DGOLLVM_DEFAULT_LINKER=ld -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
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/clang - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/clang++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- No build type selected, default to Debug
-- 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 sysexits.h
-- Looking for sysexits.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 - 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
-- Found ZLIB: /usr/lib64/libz.so (found version "1.2.11")
-- Looking for compress2
-- Looking for compress2 - found
-- Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
-- Looking for el_init in edit
-- Looking for el_init in edit - found
-- 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 __register_frame
-- Looking for __register_frame - found
-- Looking for __deregister_frame
-- Looking for __deregister_frame - found
-- 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 RISCV
-- 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: riscv64-unknown-linux-gnu
-- LLVM default target triple: riscv64-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/python3.9 (found version "3.9.0") found components: Interpreter
-- Linker detection: GNU ld
-- Found Git: /usr/bin/git (found version "2.27.0")
-- 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 "ld"
-- Performing Test C_SUPPORTS_CF_PROTECTION_BRANCH
-- Performing Test C_SUPPORTS_CF_PROTECTION_BRANCH - Failed
-- 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 - Failed
CMake Error at tools/gollvm/cmake/modules/LibbacktraceUtils.cmake:15 (message):
Libbacktrace config setup not implemented for riscv64
Call Stack (most recent call first):
tools/gollvm/libgo/CMakeLists.txt:45 (setup_libbacktrace)

CMake Error at tools/gollvm/cmake/modules/LibffiUtils.cmake:13 (message):
Arch riscv64 not yet supported
Call Stack (most recent call first):
tools/gollvm/libgo/CMakeLists.txt:49 (setup_libffi)

CMake Error at tools/gollvm/cmake/modules/LibffiUtils.cmake:91 (file):
file COPY cannot find
"/home/oceanfish81/workarea/llvm-project/llvm/tools/gollvm/libgo/libffi/src//ffitarget.h":
No such file or directory.
Call Stack (most recent call first):
tools/gollvm/libgo/CMakeLists.txt:49 (setup_libffi)

CMake Error at tools/gollvm/cmake/modules/AutoGenGo.cmake:65 (message):
unsupported arch riscv64: currently only amd64/arm64 support
Call Stack (most recent call first):
tools/gollvm/libgo/CMakeLists.txt:215 (mkversion)

/cc @thanm

riscv64-unknown-linux-gnu is not a supported configuration for Gollvm at the moment.

It's fine to experiment with doing a build on a riscv64-unknown-linux-gnu system, but the fact that Gollvm is not buildable/runnable on such a system is not a bug. Thanks.