From 0c0fb4b76559db8ba4c6dff9599300b0cc5fe3fe Mon Sep 17 00:00:00 2001
From: Simon Atanasyan <simon@atanasyan.com>
Date: Thu, 27 Sep 2018 05:04:50 +0000
Subject: [PATCH] [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
---
 clang/lib/Driver/Driver.cpp  | 10 ++++++++++
 clang/test/Driver/mips-abi.c | 25 +++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 4439e72..8266f92 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;
 }
 
diff --git a/clang/test/Driver/mips-abi.c b/clang/test/Driver/mips-abi.c
index 8591a45..f6987c13 100644
--- a/clang/test/Driver/mips-abi.c
+++ b/clang/test/Driver/mips-abi.c
@@ -162,3 +162,28 @@
 // RUN:        -march=unknown 2>&1 \
 // RUN:   | FileCheck -check-prefix=MIPS-ARCH-UNKNOWN %s
 // MIPS-ARCH-UNKNOWN: error: unknown target CPU 'unknown'
+
+// Check adjusting of target triple accordingly to `-mabi` option.
+// RUN: %clang -target mips64-linux-gnu -mabi=32 -### %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=TARGET-O32 %s
+// TARGET-O32: "-triple" "mips-unknown-linux-gnu"
+// TARGET-O32: "-target-cpu" "mips32r2"
+// TARGET-O32: "-target-abi" "o32"
+// TARGET-O32: ld{{.*}}"
+// TARGET-O32: "-m" "elf32btsmip"
+
+// RUN: %clang -target mips-linux-gnu -mabi=n32 -### %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=TARGET-N32 %s
+// TARGET-N32: "-triple" "mips64-unknown-linux-gnu"
+// TARGET-N32: "-target-cpu" "mips64r2"
+// TARGET-N32: "-target-abi" "n32"
+// TARGET-N32: ld{{.*}}"
+// TARGET-N32: "-m" "elf32btsmipn32"
+
+// RUN: %clang -target mips-linux-gnu -mabi=64 -### %s 2>&1 \
+// RUN:   | FileCheck -check-prefix=TARGET-N64 %s
+// TARGET-N64: "-triple" "mips64-unknown-linux-gnu"
+// TARGET-N64: "-target-cpu" "mips64r2"
+// TARGET-N64: "-target-abi" "n64"
+// TARGET-N64: ld{{.*}}"
+// TARGET-N64: "-m" "elf64btsmip"
-- 
2.7.4