implement a new clang-cc option -dump-build-information=filename which causes the

compiler to dump random stuff from the build into the file.  Right now this
amounts to dumping command line arguments and diagnostics to the file.

The idea is that you can set an envvar, do a world build of an OS, then grep 
through all the logs for interesting things or something.

Daniel, please wire the driver up to do something with this.

llvm-svn: 69386

1 files changed, 90 insertions, 2 deletions

diff --git a/clang/tools/clang-cc/clang-cc.cpp b/clang/tools/clang-cc/clang-cc.cpp
index ba4d77795f9..316e242dc11 100644
--- a/clang/tools/clang-cc/clang-cc.cpp
+++ b/clang/tools/clang-cc/clang-cc.cpp
@@ -1841,6 +1841,82 @@ FixItAtLocations("fixit-at", llvm::cl::value_desc("source-location"),
    llvm::cl::desc("Perform Fix-It modifications at the given source location"));
 
 //===----------------------------------------------------------------------===//
+// -dump-build-information Stuff
+//===----------------------------------------------------------------------===//
+
+static llvm::cl::opt<std::string>
+DumpBuildInformation("dump-build-information",
+                     llvm::cl::value_desc("filename"),
+          llvm::cl::desc("output a dump of some build information to a file"));
+
+static llvm::raw_ostream *BuildLogFile = 0;
+
+/// LoggingDiagnosticClient - This is a simple diagnostic client that forwards
+/// all diagnostics to both BuildLogFile and a chained DiagnosticClient.
+namespace {
+class LoggingDiagnosticClient : public DiagnosticClient {
+  llvm::OwningPtr<DiagnosticClient> Chain1;
+  llvm::OwningPtr<DiagnosticClient> Chain2;
+public:
+  
+  LoggingDiagnosticClient(DiagnosticClient *Normal) {
+    // Output diags both where requested...
+    Chain1.reset(Normal);
+    // .. and to our log file.
+    Chain2.reset(new TextDiagnosticPrinter(*BuildLogFile,
+                                           !NoShowColumn,
+                                           !NoCaretDiagnostics,
+                                           !NoShowLocation,
+                                           PrintSourceRangeInfo,
+                                           PrintDiagnosticOption));
+  }
+  
+  virtual void setLangOptions(const LangOptions *LO) {
+    Chain1->setLangOptions(LO);
+    Chain2->setLangOptions(LO);
+  }
+  
+  virtual bool IncludeInDiagnosticCounts() const {
+    return Chain1->IncludeInDiagnosticCounts();
+  }
+
+  virtual void HandleDiagnostic(Diagnostic::Level DiagLevel,
+                                const DiagnosticInfo &Info) {
+    Chain1->HandleDiagnostic(DiagLevel, Info);
+    Chain2->HandleDiagnostic(DiagLevel, Info);
+  }
+};
+} // end anonymous namespace.
+
+static void SetUpBuildDumpLog(unsigned argc, char **argv,
+                              llvm::OwningPtr<DiagnosticClient> &DiagClient) {
+  
+  std::string ErrorInfo;
+  BuildLogFile = new llvm::raw_fd_ostream(DumpBuildInformation.c_str(), false,
+                                          ErrorInfo);
+  
+  if (!ErrorInfo.empty()) {
+    llvm::errs() << "error opening -dump-build-information file '"
+                 << DumpBuildInformation << "', option ignored!\n";
+    delete BuildLogFile;
+    BuildLogFile = 0;
+    DumpBuildInformation = "";
+    return;
+  }
+
+  (*BuildLogFile) << "clang-cc command line arguments: ";
+  for (unsigned i = 0; i != argc; ++i)
+    (*BuildLogFile) << argv[i] << ' ';
+  (*BuildLogFile) << '\n';
+ 
+  // LoggingDiagnosticClient - Insert a new logging diagnostic client in between
+  // the diagnostic producers and the normal receiver.
+  DiagClient.reset(new LoggingDiagnosticClient(DiagClient.take()));
+}
+
+
+
+//===----------------------------------------------------------------------===//
 // Main driver
 //===----------------------------------------------------------------------===//
 
@@ -2252,6 +2328,17 @@ int main(int argc, char **argv) {
   } else {
     DiagClient.reset(CreateHTMLDiagnosticClient(HTMLDiag));
   }
+  
+  if (!DumpBuildInformation.empty()) {
+    if (!HTMLDiag.empty()) {
+      fprintf(stderr,
+              "-dump-build-information and -html-diags don't work together\n");
+      return 1;
+    }
+    
+    SetUpBuildDumpLog(argc, argv, DiagClient);
+  }
+  
 
   // Configure our handling of diagnostics.
   Diagnostic Diags(DiagClient.get());
@@ -2350,13 +2437,14 @@ int main(int argc, char **argv) {
     FileMgr.PrintStats();
     fprintf(stderr, "\n");
   }
+
+  delete ClangFrontendTimer;
+  delete BuildLogFile;
   
   // If verifying diagnostics and we reached here, all is well.
   if (VerifyDiagnostics)
     return 0;
   
-  delete ClangFrontendTimer;
-
   // Managed static deconstruction. Useful for making things like
   // -time-passes usable.
   llvm::llvm_shutdown();