libcxx: fix build error.

Signed-off-by: zhanghongyu <[email protected]>

arch/sim/src/cmake/Toolchain.cmake

@@ -94,6 +94,10 @@ else()
   endif()
 endif()
 
+if(CONFIG_CXX_STANDARD)
+  add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-std=${CONFIG_CXX_STANDARD}>)
+endif()
+
 set(ARCHCFLAGS "-Wstrict-prototypes")
 set(ARCHCXXFLAGS "-nostdinc++")
 

libs/libxx/0001_fix_stdatomic_h_miss_typedef.patch

@@ -0,0 +1,13 @@
+--- libcxx_old/include/stdatomic.h	2023-11-27 12:44:27.143768194 +0800
++++ libcxx/include/stdatomic.h	2023-11-27 12:31:46.498517673 +0800
+@@ -232,4 +232,10 @@ using std::atomic_thread_fence _LIBCPP_U
+
+ #endif // defined(__cplusplus) && _LIBCPP_STD_VER > 20
+
++#ifndef atomic_int
++# if __has_include_next(<stdatomic.h>)
++#   include_next <stdatomic.h>
++# endif
++#endif
++
+ #endif // _LIBCPP_STDATOMIC_H

libs/libxx/libcxx.cmake

@@ -24,22 +24,7 @@ if(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/libcxx)
 
   # cmake-format: off
   set(LIBCXX_PATCH_COMMAND
-      patch -p0 -d ${CMAKE_CURRENT_LIST_DIR} <
-      ${CMAKE_CURRENT_LIST_DIR}/0001-Remove-the-locale-fallback-for-NuttX.patch
-      && patch -p0 -d ${CMAKE_CURRENT_LIST_DIR} <
-      ${CMAKE_CURRENT_LIST_DIR}/0001-libc-avoid-the-waring-__EXCEPTIONS-is-not-defined-ev.patch
-      && patch -p1 -d ${CMAKE_CURRENT_LIST_DIR} <
-      ${CMAKE_CURRENT_LIST_DIR}/0001-libcxx-Rename-PS-macro-to-avoid-clashing-with-Xtensa.patch
-  )
-
-  if(CONFIG_LIBC_ARCH_ATOMIC)
-    list(
-      APPEND
-      LIBCXX_PATCH_COMMAND
-      && patch -p1 -d ${CMAKE_CURRENT_LIST_DIR} <
-      ${CMAKE_CURRENT_LIST_DIR}/0002-Omit-atomic_-un-signed_lock_free-if-unsupported.patch
-    )
-  endif()
+  patch -p1 -d ${CMAKE_CURRENT_LIST_DIR}/libcxx < ${CMAKE_CURRENT_LIST_DIR}/0001_fix_stdatomic_h_miss_typedef.patch)
   # cmake-format: on
   FetchContent_Declare(
     libcxx
@@ -68,13 +53,28 @@ if(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/libcxx)
     FetchContent_Populate(libcxx)
   endif()
 
+  execute_process(
+    COMMAND
+      sh -c
+      "ln -s ${CMAKE_CURRENT_LIST_DIR}/libcxx/include ${NUTTX_DIR}/include/libcxx}"
+    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+  execute_process(
+    COMMAND
+      sh -c
+      "cp ${CMAKE_CURRENT_LIST_DIR}/__config_site ${NUTTX_DIR}/include/libcxx/__config_site"
+    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
 endif()
 
 set_property(
   TARGET nuttx
   APPEND
   PROPERTY NUTTX_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_LIST_DIR}/libcxx/include)
 
+set_property(
+  TARGET nuttx
+  APPEND
+  PROPERTY NUTTX_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_LIST_DIR}/libcxx/src)
+
 add_compile_definitions(_LIBCPP_BUILDING_LIBRARY)
 if(CONFIG_LIBSUPCXX)
   add_compile_definitions(__GLIBCXX__)