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Add option --weak-unresolved-symbols to treat unresolved symbols as weak ref.

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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.
This commit is contained in:
Sriraman Tallam 2015-04-23 13:56:40 -07:00
parent 65eb8c79be
commit a100d66fb4
6 changed files with 69 additions and 5 deletions
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7
gold/symtab.cc
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@ -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())