Add a --dry-run option to llvmc2. Patch by Holger Schurig.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51781 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 8 insertions, 2 deletions

diff --git a/tools/llvmc2/Action.cpp b/tools/llvmc2/Action.cpp
index 183dd81..0841626 100644
--- a/tools/llvmc2/Action.cpp
+++ b/tools/llvmc2/Action.cpp
@@ -22,6 +22,7 @@
 using namespace llvm;
 using namespace llvmc;
 
+extern cl::opt<bool> DryRun;
 extern cl::opt<bool> VerboseMode;
 
 namespace {
@@ -65,10 +66,13 @@ namespace {
 }
 
 int llvmc::Action::Execute() const {
-  if (VerboseMode) {
+  if (DryRun || VerboseMode) {
     std::cerr << Command_ << " ";
     std::for_each(Args_.begin(), Args_.end(), print_string);
     std::cerr << '\n';
   }
-  return ExecuteProgram(Command_, Args_);
+  if (DryRun)
+    return 0;
+  else
+    return ExecuteProgram(Command_, Args_);
 }
diff --git a/tools/llvmc2/llvmc.cpp b/tools/llvmc2/llvmc.cpp
index e093439..9a2b27f 100644
--- a/tools/llvmc2/llvmc.cpp
+++ b/tools/llvmc2/llvmc.cpp
@@ -41,6 +41,8 @@ cl::opt<std::string> OutputFilename("o", cl::desc("Output file name"),
 cl::list<std::string> Languages("x",
           cl::desc("Specify the language of the following input files"),
           cl::ZeroOrMore);
+cl::opt<bool> DryRun("dry-run",
+                          cl::desc("only pretend to run commands"));
 cl::opt<bool> VerboseMode("v",
                           cl::desc("Enable verbose mode"));
 cl::opt<bool> WriteGraph("write-graph",