[ruby-core:93941] [Ruby master Misc#16025] 'st_check_for_sizeof_st_index_t' declared as array with a negative size (emscripten)

Issue #16025 has been reported by vadimp (Vadim Peretokin).

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Misc #16025: 'st_check_for_sizeof_st_index_t' declared as array with a negative size (emscripten)
https://bugs.ruby-lang.org/issues/16025

* Author: vadimp (Vadim Peretokin)
* Status: Open
* Priority: Normal
* Assignee: 
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Compilation of st.h with Emscripten 1.38.30 fails:

``` c
st.h:65:45: error: 'st_check_for_sizeof_st_index_t' declared as an
      array with a negative size
typedef char st_check_for_sizeof_st_index_t[SIZEOF_VOIDP == (int)sizeof(st_index_t) ? 1 : -1];
                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3rdparty/edbee-lib/vendor/onig/config.h:109:22: note: expanded from macro 'SIZEOF_VOIDP'
#define SIZEOF_VOIDP 8
                     ^
1 error generated.
shared:ERROR: compiler frontend failed to generate LLVM bitcode, halting
Makefile:36871: recipe for target 'regcomp.o' failed
```

Both sizeof are set to 8:

```c
onig$ cat config.h | grep SIZEOF_LONG
#define SIZEOF_LONG 8
#define SIZEOF_LONG_LONG 8
```

Is there a way to fix this issue or add a workaround for emscripten (`__EMSCRIPTEN__`)?



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