cmake: ld: Disable manual linking of libgcc components for host

When the host toolchain is used, `-nostdlib` option is not specified
and therefore all default libraries, including the libgcc and its
components, are automatically linked -- so it is not necessary to
manually link them here.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

cmake/linker/ld/target.cmake

@@ -13,14 +13,16 @@ endif()
 
 set_ifndef(LINKERFLAGPREFIX -Wl)
 
-if(CONFIG_EXCEPTIONS)
-  # When building with C++ Exceptions, it is important that crtbegin and crtend
-  # are linked at specific locations.
-  # The location is so important that we cannot let this be controlled by normal
-  # link libraries, instead we must control the link command specifically as
-  # part of toolchain.
-  set(CMAKE_CXX_LINK_EXECUTABLE
-      "<CMAKE_CXX_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> ${LIBGCC_DIR}/crtbegin.o <OBJECTS> -o <TARGET> <LINK_LIBRARIES> ${LIBGCC_DIR}/crtend.o")
+if(NOT "${ZEPHYR_TOOLCHAIN_VARIANT}" STREQUAL "host")
+  if(CONFIG_EXCEPTIONS)
+    # When building with C++ Exceptions, it is important that crtbegin and crtend
+    # are linked at specific locations.
+    # The location is so important that we cannot let this be controlled by normal
+    # link libraries, instead we must control the link command specifically as
+    # part of toolchain.
+    set(CMAKE_CXX_LINK_EXECUTABLE
+        "<CMAKE_CXX_COMPILER> <FLAGS> <CMAKE_CXX_LINK_FLAGS> <LINK_FLAGS> ${LIBGCC_DIR}/crtbegin.o <OBJECTS> -o <TARGET> <LINK_LIBRARIES> ${LIBGCC_DIR}/crtend.o")
+  endif()
 endif()
 
 # Run $LINKER_SCRIPT file through the C preprocessor, producing ${linker_script_gen}