crosstool-ng/packages/glibc-ports/2.15/0000-Fix-ARM-build-with-GCC-trunk.patch

From 175cef4163dd60f95106cfd5f593b8a4e09d02c9 Mon Sep 17 00:00:00 2001
From: Joseph Myers <joseph@codesourcery.com>
Date: Tue, 20 May 2014 21:27:13 +0000
Subject: [PATCH] Fix ARM build with GCC trunk.

sysdeps/unix/sysv/linux/arm/unwind-resume.c and
sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c have static
variables that are written in C code but only read from toplevel asms.
Current GCC trunk now optimizes away such apparently write-only static
variables, so causing a build failure.  This patch marks those
variables with __attribute_used__ to avoid that optimization.

Tested that this fixes the build for ARM.

	* sysdeps/unix/sysv/linux/arm/unwind-forcedunwind.c
	(libgcc_s_resume): Use __attribute_used__.
	* sysdeps/unix/sysv/linux/arm/unwind-resume.c (libgcc_s_resume):
	Likewise.
---
 sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-forcedunwind.c |    3 ++-
 sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-resume.c       |    3 ++-
 sysdeps/unix/sysv/linux/arm/nptl/unwind-forcedunwind.c      |    3 ++-
 sysdeps/unix/sysv/linux/arm/nptl/unwind-resume.c            |    3 ++-
 4 files changed, 8 insertions(+), 4 deletions(-)
--- a/sysdeps/unix/sysv/linux/arm/nptl/unwind-forcedunwind.c
+++ b/sysdeps/unix/sysv/linux/arm/nptl/unwind-forcedunwind.c
@@ -23,7 +23,8 @@
 #include <pthreadP.h>
 
 static void *libgcc_s_handle;
-static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc)
+  __attribute_used__;
 static _Unwind_Reason_Code (*libgcc_s_personality)
   (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
    struct _Unwind_Context *);
--- a/sysdeps/unix/sysv/linux/arm/nptl/unwind-resume.c
+++ b/sysdeps/unix/sysv/linux/arm/nptl/unwind-resume.c
@@ -21,7 +21,8 @@
 #include <stdio.h>
 #include <unwind.h>
 
-static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc)
+  __attribute_used__;
 static _Unwind_Reason_Code (*libgcc_s_personality)
   (int, _Unwind_Action, _Unwind_Exception_Class, struct _Unwind_Exception *,
    struct _Unwind_Context *);
--- a/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-forcedunwind.c
+++ b/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-forcedunwind.c
@@ -23,7 +23,8 @@
 #include <pthreadP.h>
 
 static void *libgcc_s_handle;
-static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc)
+  __attribute_used__;
 static _Unwind_Reason_Code (*libgcc_s_personality)
   (_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);
 static _Unwind_Reason_Code (*libgcc_s_forcedunwind)
--- a/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-resume.c
+++ b/sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind-resume.c
@@ -21,7 +21,8 @@
 #include <stdio.h>
 #include <unwind.h>
 
-static void (*libgcc_s_resume) (struct _Unwind_Exception *exc);
+static void (*libgcc_s_resume) (struct _Unwind_Exception *exc)
+  __attribute_used__;
 static _Unwind_Reason_Code (*libgcc_s_personality)
   (_Unwind_State, struct _Unwind_Exception *, struct _Unwind_Context *);