From 663ddf8f17c06717d0b223ab3b133fea996a7afb Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 19 Oct 2014 16:18:56 +0000
Subject: [PATCH] gcc: backport an upstream fix for extern vars with local weak
definitions
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 42962
---
.../patches/4.9-linaro/020-fix_pr61144.patch | 21 +++++++++++++++++++
1 file changed, 21 insertions(+)
create mode 100644 toolchain/gcc/patches/4.9-linaro/020-fix_pr61144.patch
diff --git a/toolchain/gcc/patches/4.9-linaro/020-fix_pr61144.patch b/toolchain/gcc/patches/4.9-linaro/020-fix_pr61144.patch
new file mode 100644
index 0000000000..a6b320d881
--- /dev/null
+++ b/toolchain/gcc/patches/4.9-linaro/020-fix_pr61144.patch
@@ -0,0 +1,21 @@
+--- a/gcc/varpool.c
++++ b/gcc/varpool.c
+@@ -329,8 +329,16 @@ ctor_for_folding (tree decl)
+
+ /* Variables declared 'const' without an initializer
+ have zero as the initializer if they may not be
+- overridden at link or run time. */
+- if (!DECL_INITIAL (real_decl)
++ overridden at link or run time.
++
++ It is actually requirement for C++ compiler to optimize const variables
++ consistently. As a GNU extension, do not enfore this rule for user defined
++ weak variables, so we support interposition on:
++ static const int dummy = 0;
++ extern const int foo __attribute__((__weak__, __alias__("dummy")));
++ */
++ if ((!DECL_INITIAL (real_decl)
++ || (DECL_WEAK (decl) && !DECL_COMDAT (decl)))
+ && (DECL_EXTERNAL (decl) || decl_replaceable_p (decl)))
+ return error_mark_node;
+
--
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