cmake(bugfix):add x86_64 arch cmake loadable mod support

supplementing the implementation of loadable construction for x86

Signed-off-by: xuxin19 <xuxin19@xiaomi.com>

arch/x86_64/src/cmake/elf.cmake

@@ -0,0 +1,27 @@
+# ##############################################################################
+# arch/x86_64/src/cmake/elf.cmake
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+# Loadable and ELF module settings
+
+nuttx_elf_compile_options(-fvisibility=hidden -fno-pic -mcmodel=large)
+
+nuttx_elf_link_options(-r)
+
+nuttx_elf_link_options_ifdef(CONFIG_DEBUG_OPT_UNUSED_SECTIONS --gc-sections)

arch/x86_64/src/common/CMakeLists.txt

@@ -79,3 +79,10 @@ if(CONFIG_ARCH_HAVE_DEBUG)
 endif()
 
 target_sources(arch PRIVATE ${SRCS})
+
+nuttx_add_aux_library(STARTUP_OBJS crt0.c)
+
+target_compile_options(
+  STARTUP_OBJS
+  PRIVATE
+    $<GENEX_EVAL:$<TARGET_PROPERTY:nuttx_global,NUTTX_ELF_APP_COMPILE_OPTIONS>>)