Bug#992349: libclang-common-11-dev: Cannot install amd64 and armhf together

[Anton]

Package: libclang-common-11-dev
Version: 1:11.0.1-2~bpo10+1
Severity: minor

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
	Try to install both packages.
	apt install clang-11/buster-backports	
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
	Manually extract files from armhf pacakge and copy it
   * What was the outcome of this action?
	I cannot install amd64 and armhf version together. It's a problem for cross-compilation with clang because you cannot link against compiler-rt.
	 For example I have issue with m4 (libm4), m4 can be compiled with gcc and linked against libgcc, also it can be compiled with clang and linked against compiler-rt, but it cannot be compiled with clang and linked against libgcc. It leads to:
/usr/bin/arm-linux-gnueabihf-ld: symtab.o: in function `symtab_init':
symtab.c:(.text+0x34): undefined reference to `__mulodi4'
/usr/bin/arm-linux-gnueabihf-ld: ../lib/libm4.a(clean-temp.o): in function `create_temp_dir':
clean-temp.c:(.text+0x9c): undefined reference to `__mulodi4'
/usr/bin/arm-linux-gnueabihf-ld: ../lib/libm4.a(fatal-signal.o): in function `at_fatal_signal':
fatal-signal.c:(.text+0x190): undefined reference to `__mulodi4'
/usr/bin/arm-linux-gnueabihf-ld: ../lib/libm4.a(xmalloc.o): in function `xnmalloc':
xmalloc.c:(.text+0x30): undefined reference to `__mulodi4'
/usr/bin/arm-linux-gnueabihf-ld: ../lib/libm4.a(xmalloc.o): in function `xnrealloc':
xmalloc.c:(.text+0xe4): undefined reference to `__mulodi4'
/usr/bin/arm-linux-gnueabihf-ld: ../lib/libm4.a(xmalloc.o):xmalloc.c:(.text+0x334): more undefined references to `__mulodi4' follow
Briefly speaking it leads to missing /usr/lib/llvm-11/lib/clang/11.0.1/lib/linux/libclang_rt.builtins-armhf.a
 
   * What outcome did you expect instead?
	I didn't expect conflict between multiarch packages.


-- System Information:
Debian Release: 10.10
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)
Foreign Architectures: armhf

Kernel: Linux 4.19.0-17-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libclang-common-11-dev depends on:
ii  libc6       2.28-10
ii  libgcc1     1:8.3.0-6
ii  libllvm11   1:11.0.1-2~bpo10+1
ii  libstdc++6  8.3.0-6

libclang-common-11-dev recommends no packages.

libclang-common-11-dev suggests no packages.

-- no debconf information