Add a -exported-symbol option to llvm-lto.

Patch by Tom Roeder.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191825 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/tools/llvm-lto/llvm-lto.cpp b/tools/llvm-lto/llvm-lto.cpp
index ab1e162..3ecd13f 100644
--- a/tools/llvm-lto/llvm-lto.cpp
+++ b/tools/llvm-lto/llvm-lto.cpp
@@ -45,6 +45,12 @@ OutputFilename("o", cl::init(""),
   cl::desc("Override output filename"),
   cl::value_desc("filename"));
 
+static cl::list<std::string>
+ExportedSymbols("exported-symbol",
+  cl::desc("Symbol to export from the resulting object file"),
+  cl::ZeroOrMore);
+
+
 int main(int argc, char **argv) {
   // Print a stack trace if we signal out.
   sys::PrintStackTraceOnErrorSignal();
@@ -107,6 +113,10 @@ int main(int argc, char **argv) {
     }
   }
 
+  // Add all the exported symbols to the table of symbols to preserve.
+  for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
+    CodeGen.addMustPreserveSymbol(ExportedSymbols[i].c_str());
+
   if (!OutputFilename.empty()) {
     size_t len = 0;
     std::string ErrorInfo;