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Don't preserve all symbols in a .so and instead trust gold to know what is 

needed. The result is that now we are able to drop unnecessary symbol from
shared libraries.

llvm-svn: 105389
This commit is contained in:
Rafael Espindola 2010-06-03 14:45:44 +00:00
parent f82aea634c
commit 00121827b2
1 changed files with 9 additions and 11 deletions
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20
llvm/tools/gold/gold-plugin.cpp
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@ -343,19 +343,17 @@ static ld_plugin_status all_symbols_read_hook(void) {
// If we don't preserve any symbols, libLTO will assume that all symbols are
// needed. Keep all symbols unless we're producing a final executable.
if (output_type == LTO_CODEGEN_PIC_MODEL_STATIC) {
bool anySymbolsPreserved = false;
for (std::list<claimed_file>::iterator I = Modules.begin(),
bool anySymbolsPreserved = false;
for (std::list<claimed_file>::iterator I = Modules.begin(),
E = Modules.end(); I != E; ++I) {
(*get_symbols)(I->handle, I->syms.size(), &I->syms[0]);
for (unsigned i = 0, e = I->syms.size(); i != e; i++) {
if (I->syms[i].resolution == LDPR_PREVAILING_DEF) {
lto_codegen_add_must_preserve_symbol(cg, I->syms[i].name);
anySymbolsPreserved = true;
(*get_symbols)(I->handle, I->syms.size(), &I->syms[0]);
for (unsigned i = 0, e = I->syms.size(); i != e; i++) {
if (I->syms[i].resolution == LDPR_PREVAILING_DEF) {
lto_codegen_add_must_preserve_symbol(cg, I->syms[i].name);
anySymbolsPreserved = true;
if (options::generate_api_file)
api_file << I->syms[i].name << "\n";
}
if (options::generate_api_file)
api_file << I->syms[i].name << "\n";
}
}