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

4 files changed, 35 insertions, 1 deletions

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 015453a..ea42289 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -23,6 +23,7 @@
 #include "cmExpandedCommandArgument.h" // IWYU pragma: keep
 #include "cmFileLockPool.h"
 #include "cmFunctionBlocker.h"
+#include "cmGeneratedFileStream.h"
 #include "cmGeneratorExpression.h"
 #include "cmGeneratorExpressionEvaluationFile.h"
 #include "cmGlobalGenerator.h"
@@ -321,7 +322,13 @@ void cmMakefile::PrintCommandTrace(const cmListFileFunction& lff) const
     msg << " ";
   }
   msg << ")";
-  cmSystemTools::Message(msg.str());
+
+  auto& f = this->GetCMakeInstance()->GetTraceFile();
+  if (f) {
+    f << msg.str() << '\n';
+  } else {
+    cmSystemTools::Message(msg.str());
+  }
 }
 
 // Helper class to make sure the call stack is valid.
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
diff --git a/Source/cmake.h b/Source/cmake.h
index 92494ae..fdcf50f 100644
--- a/Source/cmake.h
+++ b/Source/cmake.h
@@ -13,6 +13,7 @@
 #include <unordered_set>
 #include <vector>
 
+#include "cmGeneratedFileStream.h"
 #include "cmInstalledFile.h"
 #include "cmListFileCache.h"
 #include "cmMessageType.h"
@@ -401,6 +402,9 @@ public:
   {
     return this->TraceOnlyThisSources;
   }
+  cmGeneratedFileStream& GetTraceFile() { return this->TraceFile; }
+  void SetTraceFile(std::string const& file);
+
   bool GetWarnUninitialized() { return this->WarnUninitialized; }
   void SetWarnUninitialized(bool b) { this->WarnUninitialized = b; }
   bool GetWarnUnused() { return this->WarnUnused; }
@@ -547,6 +551,7 @@ private:
   bool DebugOutput = false;
   bool Trace = false;
   bool TraceExpand = false;
+  cmGeneratedFileStream TraceFile;
   bool WarnUninitialized = false;
   bool WarnUnused = false;
   bool WarnUnusedCli = true;
diff --git a/Source/cmakemain.cxx b/Source/cmakemain.cxx
index 10a6825..1fe6439 100644
--- a/Source/cmakemain.cxx
+++ b/Source/cmakemain.cxx
@@ -80,6 +80,8 @@ const char* cmDocumentationOptions[][2] = {
   { "--trace-expand", "Put cmake in trace mode with variable expansion." },
   { "--trace-source=<file>",
     "Trace only this CMake file/module. Multiple options allowed." },
+  { "--trace-redirect=<file>",
+    "Redirect trace output to a file instead of stderr." },
   { "--warn-uninitialized", "Warn about uninitialized values." },
   { "--warn-unused-vars", "Warn about unused variables." },
   { "--no-warn-unused-cli", "Don't warn about command line options." },