[driver][mips] Adjust target triple accordingly to provided ABI name

Explicitly selected MIPS ABI using the `-mabi` option implies
corresponding target triple. For 'O32' ABI it's a 32-bit target triple
like `mips-linux-gnu`. For 'N32' and 'N64' ABIs it's a 64-bit target
triple like `mips64-linux-gnu`. This patch adjusts target triple
accordingly these rules like we do for pseudo-target flags '-m64',
'-m32' etc already.

Differential revision: https://reviews.llvm.org/D52290

llvm-svn: 343169

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 4439e721f48..8266f92a3ad 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -481,6 +481,16 @@ static llvm::Triple computeTargetTriple(const Driver &D,
     Target.setVendorName("intel");
   }
 
+  // If target is MIPS adjust the target triple
+  // accordingly to provided ABI name.
+  A = Args.getLastArg(options::OPT_mabi_EQ);
+  if (A && Target.isMIPS())
+    Target = llvm::StringSwitch<llvm::Triple>(A->getValue())
+                 .Case("32", Target.get32BitArchVariant())
+                 .Case("n32", Target.get64BitArchVariant())
+                 .Case("64", Target.get64BitArchVariant())
+                 .Default(Target);
+
   return Target;
 }