ARC: MWDT: link mwdt libc only if it is required

We don't need MWDT libc if we are using minimal one provided by
Zephyr. So let's avoid linking mwdt libc if CONFIG_MINIMAL_LIBC
is enabled.

Signed-off-by: Eugeniy Paltsev <[email protected]>
Signed-off-by: Evgeniy Paltsev <[email protected]>

Author: evgeniy-paltsev

cmake/linker/arcmwdt/target.cmake

@@ -125,6 +125,18 @@ macro(toolchain_ld_baremetal)
     zephyr_ld_options(-Hnocrt)
   endif()
 
+  # There are two options:
+  # - We have full MWDT libc support and we link MWDT libc - this is default
+  #   behavior and we don't need to do something for that.
+  # - We use minimal libc provided by Zephyr itself. In that case we must not
+  #   link MWDT libc, but we still need to link libmw
+  if(CONFIG_MINIMAL_LIBC)
+    zephyr_ld_options(
+      -Hnolib
+      -Hldopt=-lmw
+    )
+  endif()
+
   # Funny thing is if this is set to =error, some architectures will
   # skip this flag even though the compiler flag check passes
   # (e.g. ARC and Xtensa). So warning should be the default for now.