Cross Compile with Clang++ 13 on Debian 10 Linker Errors

The Problem:
	Linker failures while compiling for AARCH64 on x86_64 running Debian 10 using Clang.
	I get slightly different errors depending on the value for --stdlib and which linker is used.



ld.lld: error: /usr/aarch64-linux-gnu/lib/libc.so:5: cannot find /usr/aarch64-linux-gnu/lib/libc.so.6 inside /usr/aarch64-linux-gnu

ISDiSurfaceGone: isdi_CrossTests: export OUTDIR="ARM64_Linux_Clang_Dynamic"; \
> /usr/bin/clang++-13 \
> -v \
> --target=aarch64-linux-gnu \
> -march=armv8-a \
> -fuse-ld=lld \
> -O0 \
> -fsanitize=undefined \
> --rtlib=compiler-rt \
> --stdlib=libstdc++ \
> --std=c++17 \
> -I/usr/aarch64-linux-gnu/ \
> -I/usr/aarch64-linux-gnu/include \
> -I/usr/aarch64-linux-gnu/include/c++ \
> -I/usr/aarch64-linux-gnu/include/c++/8 \
> -I/usr/aarch64-linux-gnu/include/c++/8/aarch64-linux-gnu \
> -I/usr/lib/gcc-cross/aarch64-linux-gnu/8 \
> -Wall \
> -L/usr/lib/gcc-cross/aarch64-linux-gnu/8 \
> -L/usr/aarch64-linux-gnu \
> -L/usr/aarch64-linux-gnu/lib \
> --sysroot /usr/aarch64-linux-gnu \
> --gcc-toolchain=/usr/aarch64-linux-gnu \
> -rpath /usr/lib/llvm-13/lib \
> -x c++ Source/hello.cc -o Bin/"$OUTDIR"/hello \
> |&  tee -a Bin/"$OUTDIR"/hello_$(date +%Y%m%d_%H%M%S).txt
Debian clang version 13.0.0-++20210924062625+d7b669b3a303-1~exp1~20210924163430.113
Target: aarch64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin

"/usr/lib/llvm-13/bin/clang"
	-cc1
	-triple aarch64-unknown-linux-gnu
	-emit-obj
	-mrelax-all
	--mrelax-relocations
	-disable-free
	-disable-llvm-verifier
	-discard-value-names
	-main-file-name hello.cc
	-mrelocation-model static
	-mframe-pointer=non-leaf
	-fmath-errno
	-fno-rounding-math
	-mconstructor-aliases
	-munwind-tables
	-target-cpu generic
	-target-feature +neon
	-target-abi aapcs
	-fallow-half-arguments-and-returns
	-debugger-tuning=gdb
	-v
	-fcoverage-compilation-dir=/CodeTest/isdi_CrossTests
	-resource-dir /usr/lib/llvm-13/lib/clang/13.0.0
	-I /usr/aarch64-linux-gnu/
	-I /usr/aarch64-linux-gnu/include
	-I /usr/aarch64-linux-gnu/include/c++
	-I /usr/aarch64-linux-gnu/include/c++/8
	-I /usr/aarch64-linux-gnu/include/c++/8/aarch64-linux-gnu
	-I /usr/lib/gcc-cross/aarch64-linux-gnu/8
	-isysroot /usr/aarch64-linux-gnu
	-internal-isystem /usr/lib/llvm-13/lib/clang/13.0.0/include
	-internal-isystem /usr/aarch64-linux-gnu/usr/local/include
	-internal-externc-isystem /usr/aarch64-linux-gnu/include
	-internal-externc-isystem /usr/aarch64-linux-gnu/usr/include
	-O0
	-Wall
	--std=c++17
	-fdeprecated-macro
	-fdebug-compilation-dir=/CodeTest/isdi_CrossTests
	-ferror-limit 19
	-fsanitize=alignment,array-bounds,bool,builtin,enum,float-cast-overflow,integer-divide-by-zero,nonnull-attribute,null,pointer-overflow,return,returns-nonnull-attribute,shift-base,shift-exponent,signed-integer-overflow,unreachable,vla-bound,vptr
	-fsanitize-recover=alignment,array-bounds,bool,builtin,enum,float-cast-overflow,integer-divide-by-zero,nonnull-attribute,null,pointer-overflow,returns-nonnull-attribute,shift-base,shift-exponent,signed-integer-overflow,vla-bound,vptr
	-fno-signed-char
	-fgnuc-version=4.2.1
	-fcxx-exceptions
	-fexceptions
	-target-feature +outline-atomics
	-faddrsig
	-D__GCC_HAVE_DWARF2_CFI_ASM=1
	-o /tmp/hello-ff7de7.o
	-x c++ Source/hello.cc
clang -cc1 version 13.0.0 based upon LLVM 13.0.0 default target x86_64-pc-linux-gnu
ignoring nonexistent directory "/usr/aarch64-linux-gnu/usr/local/include"
ignoring nonexistent directory "/usr/aarch64-linux-gnu/usr/include"
ignoring duplicate directory "/usr/aarch64-linux-gnu/include"
  as it is a non-system directory that duplicates a system directory
#include "..." search starts here:
#include <...> search starts here:
	/usr/aarch64-linux-gnu
	/usr/aarch64-linux-gnu/include/c++
	/usr/aarch64-linux-gnu/include/c++/8
	/usr/aarch64-linux-gnu/include/c++/8/aarch64-linux-gnu
	/usr/lib/gcc-cross/aarch64-linux-gnu/8
	/usr/lib/llvm-13/lib/clang/13.0.0/include
	/usr/aarch64-linux-gnu/include
End of search list.
"/usr/lib/llvm-13/bin/ld.lld"
	--sysroot=/usr/aarch64-linux-gnu
	-EL
	--hash-style=both
	--build-id
	--eh-frame-hdr
	-m aarch64linux
	-dynamic-linker /lib/ld-linux-aarch64.so.1
	-o Bin/ARM64_Linux_Clang_Dynamic/hello
	/usr/aarch64-linux-gnu/lib/crt1.o
	/usr/aarch64-linux-gnu/lib/crti.o
	/usr/aarch64-linux-gnu/lib/crtbegin.o
	-L/usr/lib/gcc-cross/aarch64-linux-gnu/8
	-L/usr/aarch64-linux-gnu
	-L/usr/aarch64-linux-gnu/lib
	-L/usr/aarch64-linux-gnu/lib
	--whole-archive /usr/lib/llvm-13/lib/clang/13.0.0/lib/linux/libclang_rt.ubsan_standalone-aarch64.a
	--no-whole-archive
	--dynamic-list=/usr/lib/llvm-13/lib/clang/13.0.0/lib/linux/libclang_rt.ubsan_standalone-aarch64.a.syms
	--whole-archive /usr/lib/llvm-13/lib/clang/13.0.0/lib/linux/libclang_rt.ubsan_standalone_cxx-aarch64.a
	--no-whole-archive
	--dynamic-list=/usr/lib/llvm-13/lib/clang/13.0.0/lib/linux/libclang_rt.ubsan_standalone_cxx-aarch64.a.syms
	-rpath /usr/lib/llvm-13/lib /tmp/hello-ff7de7.o
	-lstdc++
	-lm
	--no-as-needed
	-lpthread
	-lrt
	-lm
	-ldl /usr/lib/llvm-13/lib/clang/13.0.0/lib/linux/libclang_rt.builtins-aarch64.a
	-lc /usr/lib/llvm-13/lib/clang/13.0.0/lib/linux/libclang_rt.builtins-aarch64.a
	/usr/aarch64-linux-gnu/lib/crtend.o /usr/aarch64-linux-gnu/lib/crtn.o

	ld.lld: error: /usr/aarch64-linux-gnu/lib/libc.so:5: cannot find /usr/aarch64-linux-gnu/lib/libc.so.6 inside /usr/aarch64-linux-gnu
	>>> GROUP ( /usr/aarch64-linux-gnu/lib/libc.so.6 /usr/aarch64-linux-gnu/lib/libc_nonshared.a  AS_NEEDED ( /usr/aarch64-linux-gnu/lib/ld-linux-aarch64.so.1 ) )
	>>>         ^
	clang: error: linker command failed with exit code 1 (use -v to see invocation)

cannot find /usr/aarch64-linux-gnu/lib/libc.so.6
ISDiSurfaceGone: ~: ls /usr/aarch64-linux-gnu/lib/libc.so.6
lrwxrwxrwx 1 root root 12 Oct  2 08:31 /usr/aarch64-linux-gnu/lib/libc.so.6 -> libc-2.28.so
ISDiSurfaceGone: ~: ls /usr/aarch64-linux-gnu/lib/libc-2.28.so
-rwxr-xr-x 1 root root 1439544 Oct  2 08:31 /usr/aarch64-linux-gnu/lib/libc-2.28.so
ISDiSurfaceGone: ~: file /usr/aarch64-linux-gnu/lib/libc-2.28.so
/usr/aarch64-linux-gnu/lib/libc-2.28.so: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (GNU/Linux), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, BuildID[sha1]=2756a33e365fd6e64443cf0e3c679b466cb04dfc, for GNU/Linux 3.7.0, stripped
ISDiSurfaceGone: ~:


In case this helps:
ISDiSurfaceGone: ~: head -25 /usr/aarch64-linux-gnu/lib/libc.so
/* GNU ld script
   Use the shared library, but some functions are only in
   the static library, so try that secondarily.  */
OUTPUT_FORMAT(elf64-littleaarch64)
GROUP ( /usr/aarch64-linux-gnu/lib/libc.so.6 /usr/aarch64-linux-gnu/lib/libc_nonshared.a  AS_NEEDED ( /usr/aarch64-linux-gnu/lib/ld-linux-aarch64.so.1 ) )
ISDiSurfaceGone: ~: ls /usr/aarch64-linux-gnu/lib/libc.so.6
lrwxrwxrwx 1 root root 12 Oct  2 08:31 /usr/aarch64-linux-gnu/lib/libc.so.6 -> libc-2.28.so
ISDiSurfaceGone: ~: ls /usr/aarch64-linux-gnu/lib/libc_nonshared.a
-rw-r--r-- 1 root root 22940 Oct  2 08:31 /usr/aarch64-linux-gnu/lib/libc_nonshared.a
ISDiSurfaceGone: ~: ls /usr/aarch64-linux-gnu/lib/ld-linux-aarch64.so.1
lrwxrwxrwx 1 root root 10 Oct  2 08:31 /usr/aarch64-linux-gnu/lib/ld-linux-aarch64.so.1 -> ld-2.28.so




Thanks