[PATCH] Implement semantic action for SEARCH_DIR linker script command

[Ed Maste]

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Comment at: lib/Driver/GnuLdDriver.cpp:293-295
@@ -285,1 +292,5 @@
+  // Currently we only recognize a subset of the commands:
+  // - GROUP()
+  // - SEARCH_DIR()
+  for (const script::Command *c : script->_commands) {
     if (auto *group = dyn_cast<script::Group>(c))
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To me this comment implies we recognize a subset of GROUP() and SEARCH_DIR().

Maybe `Currently we only recognize this subset of linker script commands:`

http://reviews.llvm.org/D7220

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