Snippets for sbcl 2.6.7 from Nix aarch64-darwin

Sourced from https://hydra.nixos.org/log/ynlhf996mpsdciydy55ixwvzbnnwfj1x-sbcl-2.6.7.drv.

• backtrace.c:17:9: warning: '_GNU_SOURCE' macro redefined [-Wmacro-redefined]
     17 | #define _GNU_SOURCE
        |         ^
  

• monitor.c:12:9: warning: '_GNU_SOURCE' macro redefined [-Wmacro-redefined]
     12 | #define _GNU_SOURCE
        |         ^
  

• os-common.c:11:10: warning: '_GNU_SOURCE' macro redefined [-Wmacro-redefined]
     11 | # define _GNU_SOURCE /* needed for RTLD_DEFAULT from dlfcn.h */
        |          ^
  

• runtime.c:438:41: warning: passing 'const char *' to parameter of type 'char *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
    438 |     dynamic_space_size = parse_size_arg(val, "SBCL_DYNAMIC_SPACE_SIZE");
        |                                         ^~~
  

• mark-region.c:1:9: warning: '_GNU_SOURCE' macro redefined [-Wmacro-redefined]
      1 | #define _GNU_SOURCE
        |         ^
  

• gc-thread-pool.c:1:9: warning: '_GNU_SOURCE' macro redefined [-Wmacro-redefined]
      1 | #define _GNU_SOURCE
        |         ^