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authorSriraman Tallam <tmsriram@google.com>2015-04-23 13:56:40 -0700
committerSriraman Tallam <tmsriram@google.com>2015-04-23 13:56:40 -0700
commita100d66fb42044153dc0e93c96d7944dab0cc674 (patch)
tree7ab7ef6c6911cde3a440fed3c688e6b533d973f4 /gold/symtab.cc
parent65eb8c79be0c71f9b52d14563c0817fc5ca33c0d (diff)
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Add option --weak-unresolved-symbols to treat unresolved symbols as weak ref.
This patch adds option --weak-unresolved-symbols to treat unresolved symbols as weak references. This is helpful when we want the link to succeed with unresolved symbols and the dynamic loader to not complain at run-time. Option --warn-unresolved-symbols lets the link succeed but could fail at run-time with unresolved symbol warnings especially when the unresolved symbols have GOT entries and dynamic relocations against them, like when -fPIE is used.
Diffstat (limited to 'gold/symtab.cc')
-rw-r--r--gold/symtab.cc7
1 files changed, 7 insertions, 0 deletions
diff --git a/gold/symtab.cc b/gold/symtab.cc
index c197221..d2ed352 100644
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -2920,6 +2920,13 @@ Symbol_table::sized_write_globals(const Stringpool* sympool,
typename elfcpp::Elf_types<size>::Elf_Addr dynsym_value = sym_value;
elfcpp::STB binding = sym->binding();
+ // If --weak-unresolved-symbols is set, change binding of unresolved
+ // global symbols to STB_WEAK.
+ if (parameters->options().weak_unresolved_symbols()
+ && binding == elfcpp::STB_GLOBAL
+ && sym->is_undefined())
+ binding = elfcpp::STB_WEAK;
+
// If --no-gnu-unique is set, change STB_GNU_UNIQUE to STB_GLOBAL.
if (binding == elfcpp::STB_GNU_UNIQUE
&& !parameters->options().gnu_unique())