commit 9c6e71079b46ad5433165feaa2001450f2017b56
Author: Przemysław Buczkowski <prem@prem.moe>
Date:   Mon Aug 16 13:16:21 2021 +0100

    GCC: Patch for Apple Silicon compatibility
    
    This patch fixes a linker error occuring when compiling
    the cross-compiler on macOS and ARM64 architecture.
    
    Adapted from:
    https://github.com/richfelker/musl-cross-make/issues/116#issuecomment-823612404
    
    Change-Id: Ia3ee98a163bbb62689f42e2da83a5ef36beb0913
    Reviewed-on: https://review.haiku-os.org/c/buildtools/+/4329
    Reviewed-by: John Scipione <jscipione@gmail.com>
    Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -1410,7 +1410,7 @@ extern enum aarch64_code_model aarch64_c
 
 /* Extra specs when building a native AArch64-hosted compiler.
    Option rewriting rules based on host system.  */
-#if defined(__aarch64__)
+#if defined(__aarch64__) && ! defined(__APPLE__)
 extern const char *host_detect_local_cpu (int argc, const char **argv);
 #define HAVE_LOCAL_CPU_DETECT
 # define EXTRA_SPEC_FUNCTIONS                                           \
--- a/gcc/config/host-darwin.cc
+++ b/gcc/config/host-darwin.cc
@@ -23,6 +23,8 @@
 #include "options.h"
 #include "diagnostic-core.h"
 #include "config/host-darwin.h"
+#include "hosthooks.h"
+#include "hosthooks-def.h"
 #include <errno.h>
 
 /* For Darwin (macOS only) platforms, without ASLR (PIE) enabled on the
@@ -181,3 +183,5 @@ darwin_gt_pch_use_address (void *&addr,
 
   return 1;
 }
+
+const struct host_hooks host_hooks = HOST_HOOKS_INITIALIZER;