Use binary mode for reading/writing bytecode files

llvm-svn: 19751

1 files changed, 6 insertions, 3 deletions

diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
index fd339d92d98..f54844cb590 100644
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -95,6 +95,7 @@ int main(int argc, char **argv) {
     }
 
     // Figure out what stream we are supposed to write to...
+    // FIXME: cout is not binary!
     std::ostream *Out = &std::cout;  // Default to printing to stdout...
     if (OutputFilename != "-") {
       if (!Force && std::ifstream(OutputFilename.c_str())) {
@@ -104,7 +105,9 @@ int main(int argc, char **argv) {
                   << "Use -f command line argument to force output\n";
         return 1;
       }
-      Out = new std::ofstream(OutputFilename.c_str());
+      std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+                                   std::ios::binary;
+      Out = new std::ofstream(OutputFilename.c_str(), io_mode);
 
       if (!Out->good()) {
         std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
@@ -117,8 +120,8 @@ int main(int argc, char **argv) {
     }
 
     // If the output is set to be emitted to standard out, and standard out is a
-    // console, print out a warning message and refuse to do it.  We don't impress
-    // anyone by spewing tons of binary goo to a terminal.
+    // console, print out a warning message and refuse to do it.  We don't
+    // impress anyone by spewing tons of binary goo to a terminal.
     if (!Force && !NoOutput && CheckBytecodeOutputToConsole(Out,!Quiet)) {
       NoOutput = true;
     }