Как собирать софт clang'ом с musl?

$ musl-clang hello.c
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crt1.o: In function `_start':
/build/buildd/glibc-2.21/csu/../sysdeps/x86_64/start.S:111: undefined reference to `__libc_csu_fini'
/build/buildd/glibc-2.21/csu/../sysdeps/x86_64/start.S:112: undefined reference to `__libc_csu_init'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
golovin@u410:~/Документы/Development/llvm-linux/hello$ musl-clang hello.c -v
Ubuntu clang version 3.6.0-2ubuntu1 (tags/RELEASE_360/final) (based on LLVM 3.6.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9.2
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.0.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.0.1
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Selected multilib: .;@m64
 "/usr/lib/llvm-3.6/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name hello.c -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -target-linker-version 2.25 -v -dwarf-column-info -nostdsysteminc -nobuiltininc -resource-dir /usr/lib/llvm-3.6/bin/../lib/clang/3.6.0 -isystem /include -fdebug-compilation-dir /home/golovin/Документы/Development/llvm-linux/hello -ferror-limit 19 -fmessage-length 79 -mstackrealign -fobjc-runtime=gcc -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/hello-caabdd.o -x c hello.c
clang -cc1 version 3.6.0 based upon LLVM 3.6.0 default target x86_64-pc-linux-gnu
#include "..." search starts here:
#include <...> search starts here:
 /include
End of search list.
 "/bin/ld.musl-clang" --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o a.out /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crt1.o /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crti.o /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/crtbegin.o -L-user-start -L/lib -L-user-end -L/usr/bin/../lib/gcc/x86_64-linux-gnu/4.9 -L/usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../.. -L/usr/lib/llvm-3.6/bin/../lib -L/lib -L/usr/lib /tmp/hello-caabdd.o -lgcc -lgcc_eh -lc -lgcc -lgcc_eh /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/crtend.o /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crtn.o
/usr/bin/../lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crt1.o: In function `_start':
/build/buildd/glibc-2.21/csu/../sysdeps/x86_64/start.S:111: undefined reference to `__libc_csu_fini'
/build/buildd/glibc-2.21/csu/../sysdeps/x86_64/start.S:112: undefined reference to `__libc_csu_init'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

#!/bin/sh
cc="clang"
libc=""
libc_inc="/include"
libc_lib="/lib"
thisdir="`cd "$(dirname "$0")"; pwd`"

# prevent clang from running the linker (and erroring) on no input.
sflags=
eflags=
for x ; do
    case "$x" in
        -l*) input=1 ;;
        *) input= ;;
    esac
    if test "$input" ; then
        sflags="-l-user-start"
        eflags="-l-user-end"
        break
    fi
done

exec $cc \
    -B"$thisdir" \
    -fuse-ld=musl-clang \
    -static-libgcc \
    -nostdinc \
    --sysroot "$libc" \
    -isystem "$libc_inc" \
    -L-user-start \
    $sflags \
    "$@" \
    $eflags \
    -L"$libc_lib" \
    -L-user-end

#!/bin/sh
cc="clang"
libc_lib="/lib"
ldso="/lib/ld-musl-x86_64.so.1"
cleared=
shared=
userlinkdir=
userlink=

for x ; do
    test "$cleared" || set -- ; cleared=1

    case "$x" in
        -L-user-start)
            userlinkdir=1
            ;;
        -L-user-end)
            userlinkdir=
            ;;
        -L*)
            test "$userlinkdir" && set -- "$@" "$x"
            ;;
        -l-user-start)
            userlink=1
            ;;
        -l-user-end)
            userlink=
            ;;
        crtbegin*.o|crtend*.o)
            set -- "$@" $($cc -print-file-name=$x)
            ;;
        -lgcc|-lgcc_eh)
            file=lib${x#-l}.a
            set -- "$@" $($cc -print-file-name=$file)
            ;;
        -l*)
            test "$userlink" && set -- "$@" "$x"
            ;;
        -shared)
            shared=1
            set -- "$@" -shared
            ;;
        -sysroot=*|--sysroot=*)
            ;;
        *)
            set -- "$@" "$x"
            ;;
    esac
done

exec $($cc -print-prog-name=ld) -nostdlib "$@" -lc -dynamic-linker "$ldso"

$clang -print-prog-name=ld
/usr/bin/ld

-- The C compiler identification is GNU 4.9.2
-- The CXX compiler identification is GNU 4.9.2
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- 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/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:5 (string):
  string sub-command REGEX, mode MATCH needs at least 5 arguments total to
  command.


-- LLD version: 
CMake Error at CMakeLists.txt:9 (string):
  string sub-command REGEX, mode REPLACE needs at least 6 arguments total to
  command.


CMake Error at CMakeLists.txt:11 (string):
  string sub-command REGEX, mode REPLACE needs at least 6 arguments total to
  command.


CMake Error at lib/Config/CMakeLists.txt:1 (add_llvm_library):
  Unknown CMake command "add_llvm_library".


CMake Warning (dev) in CMakeLists.txt:
  No cmake_minimum_required command is present.  A line of code such as

    cmake_minimum_required(VERSION 3.2)

  should be added at the top of the file.  The version specified may be lower
  if you wish to support older CMake versions for this project.  For more
  information run "cmake --help-policy CMP0000".
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Configuring incomplete, errors occurred!