cmake(bugfix):fix libcxxabi layout build error

/home/data/vela/github/nuttx/libs/libxx/libcxxabi/libcxxabi/src/cxa_exception.h:47:10: error: 'unexpected_handler' in namespace 'std' does not name a type
   47 |     std::unexpected_handler unexpectedHandler;
      |          ^~~~~~~~~~~~~~~~~~
/home/data/vela/github/nuttx/libs/libxx/libcxxabi/libcxxabi/src/cxa_exception.h:85:10: error: 'unexpected_handler' in namespace 'std' does not name a type
   85 |     std::unexpected_handler unexpectedHandler;
      |          ^~~~~~~~~~~~~~~~~~
/home/data/vela/github/nuttx/libs/libxx/libcxxabi/libcxxabi/src/cxa_exception.h:121:65: error: static assertion failed: propagationCount has wrong negative offset
  121 |                       sizeof(_Unwind_Exception) + sizeof(void*) ==
      |                                                                 ^
/home/data/vela/github/nuttx/libs/libxx/libcxxabi/libcxxabi/src/cxa_exception.h:121:65: note: the comparison reduces to '(124 == 128)'
/home/data/vela/github/nuttx/libs/libxx/libcxxabi/libcxxabi/src/cxa_exception.h:125:65: error: static assertion failed: propagationCount has wrong negative offset
  125 |                       sizeof(_Unwind_Exception) + sizeof(void*) ==
      |

/home/data/vela/github/nuttx/libs/libxx/libcxxabi/libcxxabi/src/cxa_default_handlers.cpp:20:10: fatal error: include/atomic_support.h: No such file or directory
   20 | #include "include/atomic_support.h" // from libc++
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

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

Author: pengxianghao21

libs/libxx/libcxx/CMakeLists.txt

@@ -84,6 +84,10 @@ if(CONFIG_LIBCXX)
     add_compile_definitions(__GLIBCXX__)
   endif()
 
+  if(CONFIG_LIBCXXABI)
+    add_compile_definitions(LIBCXX_BUILDING_LIBCXXABI)
+  endif()
+
   set(CMAKE_CXX_STANDARD 20)
   set(CMAKE_CXX_STANDARD_REQUIRED ON)
   set(CMAKE_CXX_EXTENSIONS ON)

libs/libxx/libcxxabi/CMakeLists.txt

@@ -75,7 +75,14 @@ if(CONFIG_LIBCXXABI)
     cxa_thread_atexit.cpp
     cxa_vector.cpp
     cxa_virtual.cpp)
+  add_compile_definitions(_LIBCPP_BUILDING_LIBRARY)
+  if(CONFIG_LIBSUPCXX_TOOLCHAIN)
+    add_compile_definitions(__GLIBCXX__)
+  endif()
 
+  if(CONFIG_LIBSUPCXX)
+    add_compile_definitions(__GLIBCXX__)
+  endif()
   # C++ STL files
   list(APPEND SRCS stdlib_exception.cpp stdlib_new_delete.cpp
        stdlib_stdexcept.cpp stdlib_typeinfo.cpp)
@@ -120,6 +127,6 @@ if(CONFIG_LIBCXXABI)
 
   target_sources(libcxxabi PRIVATE ${TARGET_SRCS})
   target_include_directories(
-    libcxxabi BEFORE PRIVATE ${CMAKE_CURRENT_LIST_DIR}/libcxxabi/include
-                             ${CMAKE_CURRENT_LIST_DIR}/libcxx/src)
+    libcxxabi BEFORE PRIVATE ${NUTTX_DIR}/libs/libxx/libcxx/libcxx/src
+                             ${CMAKE_CURRENT_LIST_DIR}/libcxxabi/include)
 endif()