[ruby-core:108534] [Ruby master Bug#18777] NDEBUG macro defined after including ruby.h

Issue #18777 has been reported by Kerilk (Brice Videau).

----------------------------------------
Bug #18777: NDEBUG macro defined after including ruby.h
https://bugs.ruby-lang.org/issues/18777

* Author: Kerilk (Brice Videau)
* Status: Open
* Priority: Normal
* ruby -v: 3.0.2p107;3.1.2p20
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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Hello,

When using ruby 3+, including `ruby.h` results in the `NDEBUG` macro becoming defined, which deactivates assertions.
This simple (see attached `test.c` file) example illustrates this:
```C
#include <assert.h>
#include <ruby.h>

int main() {
  assert(0);
  return 0;
}
```
I expect:
```bash
gcc test.c
./a.out
```
To fail, and it does not. Commenting the `#include <ruby.h>` yields the expected result.

I found several discussion in the issues regarding `NDEBUG` in Ruby 3+, but none seem to describe this particular behavior. Sorry if I missed something.

Thanks.

---Files--------------------------------
test.c (79 Bytes)


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