1 files changed, 13 insertions, 3 deletions
diff --git a/tools/llvm-extract/llvm-extract.cpp b/tools/llvm-extract/llvm-extract.cpp
index 300bc0b4bd52..dddc0d9baa08 100644
--- a/tools/llvm-extract/llvm-extract.cpp
+++ b/tools/llvm-extract/llvm-extract.cpp
@@ -74,8 +74,18 @@ static cl::list<std::string>
 
 // ExtractBlocks - The blocks to extract from the module.
 static cl::list<std::string> ExtractBlocks(
-    "bb", cl::desc("Specify <function, basic block> pairs to extract"),
-    cl::ZeroOrMore, cl::value_desc("function:bb"), cl::cat(ExtractCat));
+    "bb",
+    cl::desc(
+        "Specify <function, basic block1[;basic block2...]> pairs to extract.\n"
+        "Each pair will create a function.\n"
+        "If multiple basic blocks are specified in one pair,\n"
+        "the first block in the sequence should dominate the rest.\n"
+        "eg:\n"
+        "  --bb=f:bb1;bb2 will extract one function with both bb1 and bb2;\n"
+        "  --bb=f:bb1 --bb=f:bb2 will extract two functions, one with bb1, one "
+        "with bb2."),
+    cl::ZeroOrMore, cl::value_desc("function:bb1[;bb2...]"),
+    cl::cat(ExtractCat));
 
 // ExtractAlias - The alias to extract from the module.
 static cl::list<std::string>
@@ -350,7 +360,7 @@ int main(int argc, char **argv) {
   Passes.add(createStripDeadPrototypesPass());   // Remove dead func decls
 
   std::error_code EC;
-  ToolOutputFile Out(OutputFilename, EC, sys::fs::F_None);
+  ToolOutputFile Out(OutputFilename, EC, sys::fs::OF_None);
   if (EC) {
     errs() << EC.message() << '\n';
     return 1;