Snippets for gcc 15.3.0 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/36nxs9n3qzpnipvn96c52g31ix82r05w-libiberty-15.3.0.drv.

• ./regex.c:3978:24: warning: implicit conversion from 'int' to enumeration type 'reg_errcode_t' is invalid in C++ [-Wimplicit-int-enum-cast]
   3978 |                   FREE_STACK_RETURN (p == pend ? REG_EBRACE : REG_BADBR);
        |                   ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

• ./sha1.c:239:11: warning: defining a type within 'offsetof' is a C23 extension [-Wc23-extensions]
    239 |       if (UNALIGNED_P (buffer))
        |           ^~~~~~~~~~~~~~~~~~~~
  

• ./choose-temp.c:71:7: warning: 'mktemp' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of mktemp(3), it is highly recommended that you use mkstemp(3) instead. [-Wdeprecated-declarations]
     71 |   if (mktemp (temp_filename) == 0)
        |       ^