Add support for systemd-binfmt

Closes: #1012367

debian/control

@@ -340,7 +340,7 @@ Description: Modular compiler and toolchain technologies
 Package: llvm-13-runtime
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Recommends: binfmt-support
+Recommends: binfmt-support | systemd
 Description: Modular compiler and toolchain technologies, IR interpreter
  LLVM is a collection of libraries and tools that make it easy to build
  compilers, optimizers, just-in-time code generators, and many other

debian/llvm-X.Y-runtime.binfmt.conf.in

@@ -0,0 +1 @@
+:llvm-@LLVM_VERSION@-runtime.binfmt:M::BC::/usr/bin/lli-@LLVM_VERSION@:

debian/llvm-X.Y-runtime.install.in

@@ -5,4 +5,5 @@ usr/bin/lli-@LLVM_VERSION@
 usr/bin/lli-child-target-@LLVM_VERSION@
 
 debian/llvm-@LLVM_VERSION@-runtime.binfmt                  usr/share/binfmts/
+debian/llvm-@LLVM_VERSION@-runtime.binfmt.conf             usr/lib/binfmt.d/
 

debian/qualify-clang.sh

@@ -305,9 +305,7 @@ fi
 clang-$VERSION -O3 -emit-llvm foo.c -c -o foo.bc
 chmod +x foo.bc
 # only run if the binfmt is installed correctly
-/usr/sbin/update-binfmts --display llvm-$VERSION-runtime.binfmt &> foo.log || true
-if grep -q "interpreter = /usr/bin/lli-" foo.log; then
-    /usr/sbin/update-binfmts --enable llvm-$VERSION-runtime.binfmt || true
+if grep -q "enabled" /proc/sys/fs/binfmt_misc/llvm-${VERSION}-runtime.binfmt; then
     if ! ./foo.bc|grep -q "lli foo"; then
         echo "executing ./foo.bc failed"
         ./foo.bc || true

debian/tests/control

@@ -1,5 +1,5 @@
 Test-Command: bash -v ./debian/qualify-clang.sh
-Depends: @, cmake, make, g++, file, dpkg-dev, binfmt-support
+Depends: @, cmake, make, g++, file, dpkg-dev
 # Comment the dbgsym package because of bug #917528
 # dbgsym packages not being available in testing
 # clang-13-dbgsym, libclang1-13-dbgsym