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$NetBSD: patch-gcc_config_aarch64_aarch64.h,v 1.2 2018/11/23 05:30:45 ryoon Exp $
driver-aarch64.o is not included for NetBSD and it is responsible for
the definition of host_detect_local_cpu.
Without it, we get an undefined reference.
Similar to GCC bugzilla #77800 for arm.
--- gcc/config/aarch64/aarch64.h.orig 2018-02-21 14:05:45.000000000 +0000
+++ gcc/config/aarch64/aarch64.h
@@ -1000,7 +1000,8 @@ extern const char *aarch64_rewrite_mcpu
#define MCPU_TO_MARCH_SPEC_FUNCTIONS \
{ "rewrite_mcpu", aarch64_rewrite_mcpu },
-#if defined(__aarch64__)
+/* NetBSD does not export necessary info via /proc/cpuinfo. */
+#if defined(__aarch64__) && !defined(__NetBSD__)
extern const char *host_detect_local_cpu (int argc, const char **argv);
#define HAVE_LOCAL_CPU_DETECT
# define EXTRA_SPEC_FUNCTIONS \
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