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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/10/23 12:34:50 UTC
[GitHub] [incubator-nuttx] xiaoxiang781216 commented on pull request #1592: libxx: Integrate libc++ latest official release
xiaoxiang781216 commented on pull request #1592:
URL: https://github.com/apache/incubator-nuttx/pull/1592#issuecomment-715314018
> @xiaoxiang781216
> can you explain about libs/libxx/libxx_impure.cxx?
_global_impure_ptr is used by libsupc++ to print error which normally provide by newlib but since NuttX has the builtin libc, we have to prvovide a dummy one.
> for which configurations is it necessary?
you can remove libxx_impure.cpp and try cxxtest in board/arm.
> with what version of libsupc++ and reent.h?
>
```
arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 9-2019-q4-major) 9.2.1 20191025 (release) [ARM/arm-9-branch revision 277599]
```
> for me it's broken.
> #2063 + a few esp32 patch.
> xtensa/esp32, with ESP-IDF provided gcc/libsupc++. (esp-2020r3-8.4.0)
> reverting this libxx_impure.cxx commit makes it builds.
can it pass link?
>
> ```
> libxx_impure.cxx:58:50: error: conflicting declaration '_reent* const _global_impure_ptr'
> struct _reent *const __ATTRIBUTE_IMPURE_PTR__ _global_impure_ptr = &impure_data;
> ^~~~~~~~~~~~~~~~~~
> In file included from /Users/yamamoto/.espressif/tools/xtensa-esp32-elf/esp-2020r3-8.4.0/xtensa-esp32-elf/xtensa-esp32-elf/sys-include/reent.h:93,
> from libxx_impure.cxx:27:
> /Users/yamamoto/.espressif/tools/xtensa-esp32-elf/esp-2020r3-8.4.0/xtensa-esp32-elf/xtensa-esp32-elf/sys-include/sys/reent.h:778:24: note: previous declaration as '_reent* _global_impure_ptr'
> extern struct _reent * _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
> ^~~~~~~~~~~~~~~~~~
> ```
it seem that the latest newlib add const to _global_impure_ptr.
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