[opt] Report if the provided architecture is invalid.

Partly addresses PR15026.

There are a few tests that passed in invalid architectures, which are fixed in: rL355349 and D58931

Reviewers: echristo, efriedma, rengolin, atrick

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D58933

llvm-svn: 355455

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/tools/opt/opt.cpp b/llvm/tools/opt/opt.cpp
index 69485c72410..2d80b479735 100644
--- a/llvm/tools/opt/opt.cpp
+++ b/llvm/tools/opt/opt.cpp
@@ -639,6 +639,11 @@ int main(int argc, char **argv) {
     CPUStr = getCPUStr();
     FeaturesStr = getFeaturesStr();
     Machine = GetTargetMachine(ModuleTriple, CPUStr, FeaturesStr, Options);
+  } else if (ModuleTriple.getArchName() != "unknown" &&
+             ModuleTriple.getArchName() != "") {
+    errs() << argv[0] << ": unrecognized architecture '"
+           << ModuleTriple.getArchName() << "' provided.\n";
+    return 1;
   }
 
   std::unique_ptr<TargetMachine> TM(Machine);