21 lines
828 B
Diff
21 lines
828 B
Diff
--- a/gcc/varpool.c
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+++ b/gcc/varpool.c
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@@ -329,8 +329,16 @@ ctor_for_folding (tree decl)
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/* Variables declared 'const' without an initializer
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have zero as the initializer if they may not be
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- overridden at link or run time. */
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- if (!DECL_INITIAL (real_decl)
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+ overridden at link or run time.
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+
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+ It is actually requirement for C++ compiler to optimize const variables
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+ consistently. As a GNU extension, do not enfore this rule for user defined
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+ weak variables, so we support interposition on:
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+ static const int dummy = 0;
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+ extern const int foo __attribute__((__weak__, __alias__("dummy")));
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+ */
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+ if ((!DECL_INITIAL (real_decl)
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+ || (DECL_WEAK (decl) && !DECL_COMDAT (decl)))
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&& (DECL_EXTERNAL (decl) || decl_replaceable_p (decl)))
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return error_mark_node;
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