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authorIan Lance Taylor <iant@google.com>2007-11-14 07:52:21 +0000
committerIan Lance Taylor <iant@google.com>2007-11-14 07:52:21 +0000
commit3728821ffcf74858b028948e224e1dc4695d9112 (patch)
tree33789e7f02b4a7cece4de72bc9ceb1381dbc34bf /gold
parente2827e5f525574e8620bd43c8bcb27dba3407a7f (diff)
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Support special always-defined symbols for targets.
Diffstat (limited to 'gold')
-rw-r--r--gold/i386.cc5
-rw-r--r--gold/symtab.cc3
-rw-r--r--gold/target.h13
-rw-r--r--gold/x86_64.cc5
4 files changed, 25 insertions, 1 deletions
diff --git a/gold/i386.cc b/gold/i386.cc
index eae6b7f..9b90c79 100644
--- a/gold/i386.cc
+++ b/gold/i386.cc
@@ -84,6 +84,11 @@ class Target_i386 : public Sized_target<32, false>
uint64_t
do_dynsym_value(const Symbol*) const;
+ // Return whether SYM is always defined.
+ bool
+ do_is_always_defined(Symbol* sym) const
+ { return strcmp(sym->name(), "___tls_get_addr") == 0; }
+
// Relocate a section.
void
relocate_section(const Relocate_info<32, false>*,
diff --git a/gold/symtab.cc b/gold/symtab.cc
index f5e2132..2443023 100644
--- a/gold/symtab.cc
+++ b/gold/symtab.cc
@@ -1610,7 +1610,8 @@ Symbol_table::sized_write_globals(const Target* target,
&& sym->object()->is_dynamic()
&& sym->shndx() == elfcpp::SHN_UNDEF
&& sym->binding() != elfcpp::STB_WEAK
- && !parameters->allow_shlib_undefined())
+ && !parameters->allow_shlib_undefined()
+ && !target->is_always_defined(sym))
{
// A very ugly cast.
Dynobj* dynobj = static_cast<Dynobj*>(sym->object());
diff --git a/gold/target.h b/gold/target.h
index 8ecc078..33c351c 100644
--- a/gold/target.h
+++ b/gold/target.h
@@ -137,6 +137,13 @@ class Target
code_fill(off_t length)
{ return this->do_code_fill(length); }
+ // Return whether SYM is a special symbol which is known to be
+ // defined. This is used to avoid inappropriate warnings about
+ // undefined symbols.
+ bool
+ is_always_defined(Symbol* sym) const
+ { return this->do_is_always_defined(sym); }
+
protected:
// This struct holds the constant information for a child class. We
// use a struct to avoid the overhead of virtual function calls for
@@ -188,6 +195,12 @@ class Target
do_code_fill(off_t)
{ gold_unreachable(); }
+ // Virtual function which may be implemented by the child class if
+ // needed.
+ virtual bool
+ do_is_always_defined(Symbol*) const
+ { return false; }
+
private:
Target(const Target&);
Target& operator=(const Target&);
diff --git a/gold/x86_64.cc b/gold/x86_64.cc
index 0614e89..ead93d9 100644
--- a/gold/x86_64.cc
+++ b/gold/x86_64.cc
@@ -97,6 +97,11 @@ class Target_x86_64 : public Sized_target<64, false>
uint64_t
do_dynsym_value(const Symbol*) const;
+ // Return whether SYM is always defined.
+ bool
+ do_is_always_defined(Symbol* sym) const
+ { return strcmp(sym->name(), "__tls_get_addr") == 0; }
+
// Relocate a section.
void
relocate_section(const Relocate_info<64, false>*,