BLD: warning from scipy/special/special/gamma.h

[ev-br]

There's a new warning when building main:

[32/247] Compiling C++ object scipy/specia...86_64-linux-gnu.so.p/_special_ufuncs.cpp.o
In file included from ../scipy/special/_special_ufuncs.cpp:15:
../scipy/special/special/gamma.h: In function 'std::complex<_Tp> special::gamma(std::complex<_Tp>) [with T = float]':
../scipy/special/special/gamma.h:19:44: warning: infinite recursion detected [-Winfinite-recursion]
   19 | SPECFUN_HOST_DEVICE inline std::complex<T> gamma(std::complex<T> z) {
      |                                            ^~~~~
../scipy/special/special/gamma.h:20:17: note: recursive call
   20 |     return gamma(z);
      |            ~~~~~^~~

[ilayn]

Also #20390 (review) and a few times this has been discussed but can't remember where. At some point we have to clean up the C++ overhaul. Since 1.13 is out we don't have the time pressure anymore.

[ev-br]

Feel free to close if it's known