Driver: Sketch driver support for a CC_LOG_DIAGNOSTICS options, similar to the

existing CC_PRINT_OPTIONS and CC_PRINT_HEADERS, which can be used to
transparently capture the compiler diagnostics from a build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@129082 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 12 insertions, 4 deletions

diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 9d02dee540..78720ed0b3 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -63,11 +63,13 @@ Driver::Driver(llvm::StringRef _ClangExecutable,
     DefaultHostTriple(_DefaultHostTriple), DefaultImageName(_DefaultImageName),
     DriverTitle("clang \"gcc-compatible\" driver"),
     Host(0),
-    CCPrintOptionsFilename(0), CCPrintHeadersFilename(0), CCCIsCXX(false),
+    CCPrintOptionsFilename(0), CCPrintHeadersFilename(0),
+    CCLogDiagnosticsFilename(0), CCCIsCXX(false),
     CCCIsCPP(false),CCCEcho(false), CCCPrintBindings(false),
-    CCPrintOptions(false), CCPrintHeaders(false), CCCGenericGCCName("gcc"),
-    CheckInputsExist(true), CCCUseClang(true), CCCUseClangCXX(true),
-    CCCUseClangCPP(true), CCCUsePCH(true), SuppressMissingInputWarning(false) {
+    CCPrintOptions(false), CCPrintHeaders(false), CCLogDiagnostics(false),
+    CCCGenericGCCName("gcc"), CheckInputsExist(true), CCCUseClang(true),
+    CCCUseClangCXX(true), CCCUseClangCPP(true), CCCUsePCH(true),
+    SuppressMissingInputWarning(false) {
   if (IsProduction) {
     // In a "production" build, only use clang on architectures we expect to
     // work, and don't use clang C++.
diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index e7228229ea..77ff2a025f 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -1246,6 +1246,12 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   Args.AddLastArg(CmdArgs, options::OPT_P);
   Args.AddLastArg(CmdArgs, options::OPT_print_ivar_layout);
 
+  if (D.CCLogDiagnostics) {
+    CmdArgs.push_back("-diagnostic-log-file");
+    CmdArgs.push_back(D.CCLogDiagnosticsFilename ?
+                      D.CCLogDiagnosticsFilename : "-");
+  }
+
   // Special case debug options to only pass -g to clang. This is
   // wrong.
   Args.ClaimAllArgs(options::OPT_g_Group);