binutils: Always search DT_RPATH

pkgs/development/tools/misc/binutils/always-search-rpath.patch

@@ -0,0 +1,14 @@
+diff --git a/ld/genscripts.sh b/ld/genscripts.sh
+index b6940d376d..0feb1adfd0 100755
+--- a/ld/genscripts.sh
++++ b/ld/genscripts.sh
+@@ -125,6 +125,9 @@ if test "x$NATIVE" = "xyes" ; then
+   USE_LIBPATH=yes
+ fi
+ 
++# TODO: why is this needed?
++USE_LIBPATH=yes
++
+ # Set the library search path, for libraries named by -lfoo.
+ # If LIB_PATH is defined (e.g., by Makefile) and non-empty, it is used.
+ # Otherwise, the default is set here.

pkgs/development/tools/misc/binutils/default.nix

@@ -53,6 +53,14 @@ stdenv.mkDerivation rec {
     # elf32-littlearm-vxworks in favor of the first.
     # https://github.com/NixOS/nixpkgs/pull/30484#issuecomment-345472766
     ./disambiguate-arm-targets.patch
+
+    # For some reason bfd ld doesn't search DT_RPATH when cross-compiling. It's
+    # not clear why this behavior was decided upon but it has the unfortunate
+    # consequence that the linker will fail to find transitive dependencies of
+    # shared objects when cross-compiling. Consequently, we are forced to
+    # override this behavior, forcing ld to search DT_RPATH even when
+    # cross-compiling.
+    ./always-search-rpath.patch
   ];
 
   outputs = [ "out" "info" "man" ];