Add the -mcpu= option to llvm-rtdyld.

[vradosavljevic]

Summary

This patch adds the -mcpu= option to llvm-rtdyld. With this option, we can test relocations for different types of CPUs (e.g., Mips64r6).

[vradosavljevic]

Ping.

[petarj]

lgtm

Lang, are you OK with the change?

[lhames]

Apologies for the delayed reply. This looks good to me.

llvm/trunk/tools/llvm-rtdyld/llvm-rtdyld.cpp

 static cl::list<std::string>
 Dylibs("dylib",
        cl::desc("Add library."),
        cl::ZeroOrMore);
 
 static cl::opt<std::string>
 TripleName("triple", cl::desc("Target triple for disassembler"));
 
+static cl::opt<std::string>
+MCPU("mcpu",
+     cl::desc("Target a specific cpu type (-mcpu=help for details)"),
+     cl::value_desc("cpu-name"),
+     cl::init(""));
+
 static cl::list<std::string>
 CheckFiles("check",
            cl::desc("File containing RuntimeDyld verifier checks."),
            cl::ZeroOrMore);
 
 static cl::opt<uint64_t>
 TargetAddrStart("target-addr-start",
                 cl::desc("For -verify only: start of phony target address "
static int linkAndVerify() {
   if (!TheTarget) {
     llvm::errs() << "Error accessing target '" << TripleName << "': "
                  << ErrorStr << "\n";
     return 1;
   }
   TripleName = TheTriple.getTriple();
 
   std::unique_ptr<MCSubtargetInfo> STI(
-    TheTarget->createMCSubtargetInfo(TripleName, "", ""));
+    TheTarget->createMCSubtargetInfo(TripleName, MCPU, ""));
   assert(STI && "Unable to create subtarget info!");
 
   std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
   assert(MRI && "Unable to create target register info!");
 
   std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
   assert(MAI && "Unable to create target asm info!");