We want the dwarf AT_producer for assembly source files to match clang's

AT_producer.  Which includes clang's version information so we can tell
which version of the compiler was used.

This is second of the two steps to allow us to do this.  The first was a
change to llvm-mc with revision 172630 to provide a method to set the
AT_producer string.  This second step has the clang driver passing the value
of getClangFullVersion() via the new flag -dwarf-debug-producer when invoking
the integrated assembler on assembly source files.  Then using the new
setDwarfDebugProducer() method to set the AT_producer string.

rdar://12888242

llvm-svn: 172758

clang/include/clang/Driver/CC1AsOptions.td

@@ -93,3 +93,6 @@ def fdebug_compilation_dir : Separate<["-"], "fdebug-compilation-dir">,
 
 def dwarf_debug_flags : Separate<["-"], "dwarf-debug-flags">,
   HelpText<"The string to embed in the Dwarf debug flags record.">;
+
+def dwarf_debug_producer : Separate<["-"], "dwarf-debug-producer">,
+  HelpText<"The string to embed in the Dwarf debug AT_producer record.">;

clang/lib/Driver/Tools.cpp

@@ -12,6 +12,7 @@
 #include "SanitizerArgs.h"
 #include "ToolChains.h"
 #include "clang/Basic/ObjCRuntime.h"
+#include "clang/Basic/Version.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Arg.h"
 #include "clang/Driver/ArgList.h"
@@ -3341,6 +3342,11 @@ void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,
 
     // Add the -fdebug-compilation-dir flag if needed.
     addDebugCompDirArg(Args, CmdArgs);
+
+    // Set the AT_producer to the clang version when using the integrated
+    // assembler on assembly source files.
+    CmdArgs.push_back("-dwarf-debug-producer");
+    CmdArgs.push_back(Args.MakeArgString(getClangFullVersion()));
   }
 
   // Optionally embed the -cc1as level arguments into the debug info, for build

clang/test/Driver/darwin-debug-flags.c

@@ -2,6 +2,8 @@
 // <rdar://problem/7256886>
 // RUN: touch %t.s
 // RUN: env RC_DEBUG_OPTIONS=1 %clang -### -target i386-apple-darwin9 -c -g %t.s 2>&1 | FileCheck -check-prefix=S %s
+// <rdar://problem/12955296>
+// RUN: %clang -### -target i386-apple-darwin9 -c -g %t.s 2>&1 | FileCheck -check-prefix=P %s
 
 // CHECK: !0 = metadata !{
 // CHECK: -g -Os
@@ -11,3 +13,5 @@
 int x;
 
 // S: "-dwarf-debug-flags"
+
+// P: "-dwarf-debug-producer"

clang/test/Driver/debug-options-as.c

@@ -18,3 +18,12 @@
 //
 // CHECK: "-cc1as"
 // CHECK: "-g"
+
+// Check to make sure clang with -g on a .s file gets passed -dwarf-debug-producer.
+// rdar://12955296
+// RUN: touch %t.s
+// RUN: %clang -### -c -integrated-as -g %t.s 2>&1 \
+// RUN:   | FileCheck -check-prefix=P %s
+//
+// P: "-cc1as"
+// P: "-dwarf-debug-producer"

clang/tools/driver/cc1as_main.cpp

@@ -83,6 +83,7 @@ struct AssemblerInvocation {
   unsigned SaveTemporaryLabels : 1;
   unsigned GenDwarfForAssembly : 1;
   std::string DwarfDebugFlags;
+  std::string DwarfDebugProducer;
   std::string DebugCompilationDir;
   std::string MainFileName;
 
@@ -183,6 +184,7 @@ bool AssemblerInvocation::CreateFromArgs(AssemblerInvocation &Opts,
   Opts.SaveTemporaryLabels = Args->hasArg(OPT_L);
   Opts.GenDwarfForAssembly = Args->hasArg(OPT_g);
   Opts.DwarfDebugFlags = Args->getLastArgValue(OPT_dwarf_debug_flags);
+  Opts.DwarfDebugProducer = Args->getLastArgValue(OPT_dwarf_debug_producer);
   Opts.DebugCompilationDir = Args->getLastArgValue(OPT_fdebug_compilation_dir);
   Opts.MainFileName = Args->getLastArgValue(OPT_main_file_name);
 
@@ -309,6 +311,8 @@ static bool ExecuteAssembler(AssemblerInvocation &Opts,
     Ctx.setGenDwarfForAssembly(true);
   if (!Opts.DwarfDebugFlags.empty())
     Ctx.setDwarfDebugFlags(StringRef(Opts.DwarfDebugFlags));
+  if (!Opts.DwarfDebugProducer.empty())
+    Ctx.setDwarfDebugProducer(StringRef(Opts.DwarfDebugProducer));
   if (!Opts.DebugCompilationDir.empty())
     Ctx.setCompilationDir(Opts.DebugCompilationDir);
   if (!Opts.MainFileName.empty())