typedef redefinition with different types about emscripten

[sbc100]

Can you share a little more about what is contained in main.cpp? What files are being included in what order?

[sbc100]

It looks like maybe you have your own copy of stddef.h in the include directory which conflicts with emscripten's version.

include\stddef.h:437:3: error: typedef redefinition with different types ('struct max_align_t' vs 'struct max_align_t')
  437 | } max_align_t;

Any idea why include\stddef.h exists or where it comes from?

[adokhugi]

Thanks for your answers. I don't include stddef.h directly from main.cpp but there appear some include statements in some of the files that are themselves directly or indirectly included in main.cpp. I'm just puzzled at the error message that says "('struct max_align_t' vs 'struct max_align_t')" because for me these two type definitions are identical and therefore they should not pose a problem.

[adokhugi]

Apparently the includes appear in these files:

In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1\fstream:182:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__algorithm/max.h:14:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__algorithm/max_element.h:15:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__iterator/iterator_traits.h:14:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__concepts/constructible.h:12:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__concepts/convertible_to.h:13:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__type_traits/is_convertible.h:14:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1__type_traits/is_array.h:14:
In file included from C:\Projects\levasoft\emsdk\upstream\emscripten\cache\sysroot/include/c++/v1\cstddef:43:

So all of these files are files that come along with emscripten, that's why my problem is related to emscripten. It's really strange IMHO and I wonder whether maybe some compiler flags have to be set to solve it.

[sbc100]

The error message says that you have a typedef of max_align_t in your include\stddef.h that is different to emscripten's typedef.

It almost impossible to avoiding including stddef.h so that problem is not that its being included but that the wrong copy is being include (i.e. the one from your project).

Can you see what the definition on line 437 of your include\stddef.h file says?

My advice you would remove that include\stddef.h completely, or the remove the -Iinclude flag which causes it to be included.

[adokhugi]

OK, I noticed that indeed I made copies of the include files, which I have now removed and now I no longer get the error message. Thanks!