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Add a pass-through option to the plugin. The use case for this option is to

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ask the linker to take another look into some library or object. The case when
one might want to do this is when codegen introduces a new undefined reference.
The canonical example is libgcc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106303 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-06-18 19:18:58 +00:00
parent e0f0c7b024
commit dd76f18f90
1 changed files with 26 additions and 0 deletions
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26
tools/gold/gold-plugin.cpp
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@ -41,6 +41,7 @@ namespace {
ld_plugin_add_symbols add_symbols = NULL;
ld_plugin_get_symbols get_symbols = NULL;
ld_plugin_add_input_file add_input_file = NULL;
ld_plugin_add_input_library add_input_library = NULL;
ld_plugin_message message = discard_message;
int api_version = 0;
@ -64,6 +65,7 @@ namespace options {
static generate_bc generate_bc_file = BC_NO;
static std::string bc_path;
static std::string as_path;
static std::vector<std::string> pass_through;
// Additional options to pass into the code generator.
// Note: This array will contain all plugin options which are not claimed
// as plugin exclusive to pass to the code generator.
@ -86,6 +88,9 @@ namespace options {
} else {
as_path = opt.substr(strlen("as="));
}
} else if (opt.startswith("pass-through=")) {
llvm::StringRef item = opt.substr(strlen("pass-through="));
pass_through.push_back(item.str());
} else if (opt == "emit-llvm") {
generate_bc_file = BC_ONLY;
} else if (opt == "also-emit-llvm") {
@ -190,6 +195,9 @@ ld_plugin_status onload(ld_plugin_tv *tv) {
case LDPT_ADD_INPUT_FILE:
add_input_file = tv->tv_u.tv_add_input_file;
break;
case LDPT_ADD_INPUT_LIBRARY:
add_input_library = tv->tv_u.tv_add_input_file;
break;
case LDPT_MESSAGE:
message = tv->tv_u.tv_message;
break;
@ -437,6 +445,24 @@ static ld_plugin_status all_symbols_read_hook(void) {
return LDPS_ERR;
}
for (std::vector<std::string>::iterator i = options::pass_through.begin(),
e = options::pass_through.end();
i != e; ++i) {
std::string &item = *i;
char *item_p = const_cast<char*>(item.c_str());
if (llvm::StringRef(item).startswith("-l")) {
if (add_input_library(item_p + 2) != LDPS_OK) {
(*message)(LDPL_ERROR, "Unable to add library to the link.");
return LDPS_ERR;
}
} else {
if (add_input_file(item_p) != LDPS_OK) {
(*message)(LDPL_ERROR, "Unable to add .o file to the link.");
return LDPS_ERR;
}
}
}
Cleanup.push_back(uniqueObjPath);
return LDPS_OK;