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gcc: backport an upstream fix for extern vars with local weak definitions

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 42962
This commit is contained in:
Felix Fietkau 2014-10-19 16:18:56 +00:00
parent fedcfd0303
commit 663ddf8f17
1 changed files with 21 additions and 0 deletions
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21
toolchain/gcc/patches/4.9-linaro/020-fix_pr61144.patch Normal file
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@ -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;