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authorYiran Wang <yiran@google.com>2015-06-23 22:33:17 (GMT)
committerYiran Wang <yiran@google.com>2015-06-29 17:56:28 (GMT)
commit1d9fec7937f45dde5e04cac966a2d9a12f2fc15a (patch)
tree3fbcd18a379a05fd6d43491a107e1f36bc61b185 /gcc-4.9/gcc/varpool.c
parentf378ebf14df0952eae870c9865bab8326aa8f137 (diff)
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Synchronize with google/gcc-4_9 to r224707 (from r214835)
Change-Id: I3d6f06fc613c8f8b6a82143dc44b7338483aac5d
Diffstat (limited to 'gcc-4.9/gcc/varpool.c')
-rw-r--r--gcc-4.9/gcc/varpool.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc-4.9/gcc/varpool.c b/gcc-4.9/gcc/varpool.c
index d9b9a1a..6b64397 100644
--- a/gcc-4.9/gcc/varpool.c
+++ b/gcc-4.9/gcc/varpool.c
@@ -335,8 +335,16 @@ 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;