From e2b8cec05b2d18892c8375b575a727dbeb95c864 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Mon, 11 Aug 2014 19:41:05 -0700
Subject: [PATCH] configure: add work around for gcc-4.9 aarch64 bug

add -frename-registers to avoid:
src/dsp/dec_neon.c:1234:1: internal
compiler error: in simplify_const_unary_operation, at
simplify-rtx.c:1539

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62040
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61622
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=757738

Change-Id: I52fb3a29ac30b82b27da05378bdb495ddebb97d7
---
 configure.ac | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/configure.ac b/configure.ac
index 32b99e9a..4f1ef58d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,6 +62,19 @@ TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wshadow])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wunused-but-set-variable])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wunused])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wvla])
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62040
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61622
+AS_IF([test "$GCC" = "yes" ], [
+       gcc_version=`$CC -dumpversion`
+       gcc_wht_bug=""
+       case "$host_cpu" in
+         aarch64|arm64)
+          case "$gcc_version" in
+            4.9|4.9.0|4.9.1) gcc_wht_bug=yes ;;
+          esac
+       esac
+       AS_IF([test "$gcc_wht_bug" = "yes"], [
+              TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-frename-registers])])])
 AC_SUBST([AM_CFLAGS])
 
 dnl === Check for machine specific flags