fix extern naming (#1238)

d877f371 · Leyuan Wang · Tianqi Chen · 54874e73 · d877f371
Commit d877f371 authored Jun 06, 2018 by Leyuan Wang Committed by Tianqi Chen Jun 06, 2018
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src/codegen/codegen_c.cc
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--- a/src/codegen/codegen_c.cc
+++ b/src/codegen/codegen_c.cc
@@ -27,6 +27,7 @@ void CodeGenC::AddFunction(LoweredFunc f) {
  this->InitFuncState(f);
  // skip the first underscore, so SSA variable starts from _1
  GetUniqueName("_");
+  GetUniqueName("extern");
  // add to alloc buffer type.
  for (const auto & kv : f->handle_data_type) {
    RegisterHandleType(kv.first.get(), kv.second.type());