Re: [I] [BUG] cmath incompatible with external toolchain libraries [nuttx]

["snikeguo (via GitHub)" <gi...@apache.org>]

snikeguo commented on issue #18232:
URL: https://github.com/apache/nuttx/issues/18232#issuecomment-3988956759

   @acassis  @simbit18  
   I am very sorry, I was on vacation recently.after testing, the compilation still fails. Here are the test code and compilation results:
   ```
   #include <stdint.h>
   #include <stddef.h>
   #include <stdio.h>
   #include <stdlib.h>
   #include <string.h>
   #include <wchar.h>
   #include <assert.h>
   #include <stdarg.h>
   #include <memory.h>
   #include <limits.h>
   #include <math.h>
   
   #include <new>
   #include <type_traits>
   #include <limits>
   #include <algorithm>
   
   
   D:/Project/runtime_nuttx/src/nuttx_workspace/apps/ics/NativeAot/user_code/usercode.cpp
   In file included from D:/Soft/ArmGcc/xpack-arm-none-eabi-gcc-13.3.1-1.1/arm-none-eabi/include/c++/13.3.1/bits/std_abs.h:38,
                    from D:/Soft/ArmGcc/xpack-arm-none-eabi-gcc-13.3.1-1.1/arm-none-eabi/include/c++/13.3.1/cmath:49,
                    from D:/Project/runtime_nuttx/src/nuttx_workspace/nuttx/include/cxx/cmath:38,
                    from D:/Soft/ArmGcc/xpack-arm-none-eabi-gcc-13.3.1-1.1/arm-none-eabi/include/c++/13.3.1/math.h:36,
                    from D:/Project/runtime_nuttx/src/nuttx_workspace/apps/ics/NativeAot/user_code/usercode.cpp:221:
   D:/Soft/ArmGcc/xpack-arm-none-eabi-gcc-13.3.1-1.1/arm-none-eabi/include/stdlib.h:39:3: error: conflicting declaration 'typedef struct div_t div_t'
      39 | } div_t;
         |   ^~~~~
   In file included from D:/Project/runtime_nuttx/src/nuttx_workspace/nuttx/include/nuttx/kmalloc.h:34,
                    from D:/Project/runtime_nuttx/src/nuttx_workspace/nuttx/include/nuttx/lib/lib.h:32,
                    from D:/Project/runtime_nuttx/src/nuttx_workspace/nuttx/include/stdio.h:37,
                    from D:/Project/runtime_nuttx/src/nuttx_workspace/apps/include/netutils/netlib.h:50,
                    from D:/Project/runtime_nuttx/src/nuttx_workspace/apps/ics/NativeAot/user_code/usercode.cpp:105:
   D:/Project/runtime_nuttx/src/nuttx_workspace/nuttx/include/stdlib.h:98:22: note: previous declaration as 'typedef struct div_s div_t'
      98 | typedef struct div_s div_t;
   ```
   
   It is worth noting that I have switched to using the LLVM C++ library, and it works well.


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