Add --trace-redirect parameter to redirect trace output to a file

1 files changed, 20 insertions, 0 deletions

diff --git a/Source/cmake.cxx b/Source/cmake.cxx
index a81b7e4..98dfd21 100644
--- a/Source/cmake.cxx
+++ b/Source/cmake.cxx
@@ -140,6 +140,7 @@ cmake::cmake(Role role, cmState::Mode mode)
   , State(cm::make_unique<cmState>())
   , Messenger(cm::make_unique<cmMessenger>())
 {
+  this->TraceFile.close();
   this->State->SetMode(mode);
   this->CurrentSnapshot = this->State->CreateBaseSnapshot();
 
@@ -740,6 +741,11 @@ void cmake::SetArgs(const std::vector<std::string>& args)
       cmSystemTools::ConvertToUnixSlashes(file);
       this->AddTraceSource(file);
       this->SetTrace(true);
+    } else if (arg.find("--trace-redirect=", 0) == 0) {
+      std::string file = arg.substr(strlen("--trace-redirect="));
+      cmSystemTools::ConvertToUnixSlashes(file);
+      this->SetTraceFile(file);
+      this->SetTrace(true);
     } else if (arg.find("--trace", 0) == 0) {
       std::cout << "Running with trace output on.\n";
       this->SetTrace(true);
@@ -870,6 +876,20 @@ cmake::LogLevel cmake::StringToLogLevel(const std::string& levelStr)
   return (it != levels.cend()) ? it->second : LogLevel::LOG_UNDEFINED;
 }
 
+void cmake::SetTraceFile(const std::string& file)
+{
+  this->TraceFile.close();
+  this->TraceFile.open(file.c_str());
+  if (!this->TraceFile) {
+    std::stringstream ss;
+    ss << "Error opening trace file " << file << ": "
+       << cmSystemTools::GetLastSystemError();
+    cmSystemTools::Error(ss.str());
+    return;
+  }
+  std::cout << "Trace will be written to " << file << "\n";
+}
+
 void cmake::SetDirectoriesFromFile(const std::string& arg)
 {
   // Check if the argument refers to a CMakeCache.txt or