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[LTO] Ignore -plugin/-plugin-opt options. 

This is required to get 'clang -flto' to work transparently
with lld. Please refer to the short comment in the code
for a more detailed explanation.

llvm-svn: 263862
This commit is contained in:
Davide Italiano 2016-03-19 00:40:09 +00:00
parent 072c395fda
commit 67e03a1ce6
1 changed files with 10 additions and 0 deletions
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10
lld/ELF/Options.td
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@ -181,6 +181,16 @@ def end_group_paren: Flag<["-"], ")">;
def start_group : Flag<["--"], "start-group">;
def start_group_paren: Flag<["-"], "(">;
// Ignore LTO plugin-related options.
// clang -flto passes -plugin and -plugin-opt to the linker. This is required
// for ld.gold and ld.bfd to get LTO working. But it's not for lld which doesn't
// rely on a plugin. Instead of detecting which linker is used on clang side we
// just ignore the option on lld side as it's easier. In fact, the linker could
// be called 'ld' and understanding which linker is used would require parsing of
// --version output.
def plugin : Separate<["-"], "plugin">;
def plugin_opt : Joined<["-"], "plugin-opt=">;
// Options listed below are silently ignored for now for compatibility.
def fatal_warnings : Flag<["--"], "fatal-warnings">;
def no_add_needed : Flag<["--"], "no-add-needed">;