From 751510cd78fb15f677b5cdebfedee6a28ad2ad99 Mon Sep 17 00:00:00 2001
From: Simon Atanasyan <simon@atanasyan.com>
Date: Tue, 2 Apr 2019 18:03:31 +0000
Subject: [PATCH] [driver][mips] Check both `gnuabi64` and `gnu` suffixes in
 `getMultiarchTriple`

In case of N64 ABI toolchain paths migth have `mips-linux-gnuabi64`
or `mips-linux-gnu` directory regardless of selected environment.
Check both variants while detecting a multiarch triple.

Fix for the bug https://bugs.llvm.org/show_bug.cgi?id=41204

llvm-svn: 357506
---
 clang/lib/Driver/ToolChains/Linux.cpp | 33 +++++++++++++++------------
 clang/test/Driver/linux-ld.c          | 10 ++++++++
 2 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp
index 2be31d6f49ca..50b392498acb 100644
--- a/clang/lib/Driver/ToolChains/Linux.cpp
+++ b/clang/lib/Driver/ToolChains/Linux.cpp
@@ -44,6 +44,7 @@ static std::string getMultiarchTriple(const Driver &D,
       TargetTriple.getEnvironment();
   bool IsAndroid = TargetTriple.isAndroid();
   bool IsMipsR6 = TargetTriple.getSubArch() == llvm::Triple::MipsSubArch_r6;
+  bool IsMipsN32Abi = TargetTriple.getEnvironment() == llvm::Triple::GNUABIN32;
 
   // For most architectures, just use whatever we have rather than trying to be
   // clever.
@@ -102,33 +103,37 @@ static std::string getMultiarchTriple(const Driver &D,
       return "aarch64_be-linux-gnu";
     break;
   case llvm::Triple::mips: {
-    std::string Arch = IsMipsR6 ? "mipsisa32r6" : "mips";
-    if (D.getVFS().exists(SysRoot + "/lib/" + Arch + "-linux-gnu"))
-      return Arch + "-linux-gnu";
+    std::string MT = IsMipsR6 ? "mipsisa32r6-linux-gnu" : "mips-linux-gnu";
+    if (D.getVFS().exists(SysRoot + "/lib/" + MT))
+      return MT;
     break;
   }
   case llvm::Triple::mipsel: {
     if (IsAndroid)
       return "mipsel-linux-android";
-    std::string Arch = IsMipsR6 ? "mipsisa32r6el" : "mipsel";
-    if (D.getVFS().exists(SysRoot + "/lib/" + Arch + "-linux-gnu"))
-      return Arch + "-linux-gnu";
+    std::string MT = IsMipsR6 ? "mipsisa32r6el-linux-gnu" : "mipsel-linux-gnu";
+    if (D.getVFS().exists(SysRoot + "/lib/" + MT))
+      return MT;
     break;
   }
   case llvm::Triple::mips64: {
-    std::string Arch = IsMipsR6 ? "mipsisa64r6" : "mips64";
-    std::string ABI = llvm::Triple::getEnvironmentTypeName(TargetEnvironment);
-    if (D.getVFS().exists(SysRoot + "/lib/" + Arch + "-linux-" + ABI))
-      return Arch + "-linux-" + ABI;
+    std::string MT = std::string(IsMipsR6 ? "mipsisa64r6" : "mips64") +
+                     "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64");
+    if (D.getVFS().exists(SysRoot + "/lib/" + MT))
+      return MT;
+    if (D.getVFS().exists(SysRoot + "/lib/mips64-linux-gnu"))
+      return "mips64-linux-gnu";
     break;
   }
   case llvm::Triple::mips64el: {
     if (IsAndroid)
       return "mips64el-linux-android";
-    std::string Arch = IsMipsR6 ? "mipsisa64r6el" : "mips64el";
-    std::string ABI = llvm::Triple::getEnvironmentTypeName(TargetEnvironment);
-    if (D.getVFS().exists(SysRoot + "/lib/" + Arch + "-linux-" + ABI))
-      return Arch + "-linux-" + ABI;
+    std::string MT = std::string(IsMipsR6 ? "mipsisa64r6el" : "mips64el") +
+                     "-linux-" + (IsMipsN32Abi ? "gnuabin32" : "gnuabi64");
+    if (D.getVFS().exists(SysRoot + "/lib/" + MT))
+      return MT;
+    if (D.getVFS().exists(SysRoot + "/lib/mips64el-linux-gnu"))
+      return "mips64el-linux-gnu";
     break;
   }
   case llvm::Triple::ppc:
diff --git a/clang/test/Driver/linux-ld.c b/clang/test/Driver/linux-ld.c
index c5041c9a14a6..c82d167d4f0c 100644
--- a/clang/test/Driver/linux-ld.c
+++ b/clang/test/Driver/linux-ld.c
@@ -1660,6 +1660,11 @@
 // CHECK-DEBIAN-ML-MIPS64EL-N32: "-L[[SYSROOT]]/usr/lib"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=mips64-unknown-linux-gnu \
+// RUN:     --gcc-toolchain="" \
+// RUN:     --sysroot=%S/Inputs/debian_6_mips64_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-ML-MIPS64-GNUABI %s
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64-linux-gnuabi64 -mabi=n64 \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/debian_6_mips64_tree \
@@ -1680,6 +1685,11 @@
 // CHECK-DEBIAN-ML-MIPS64-GNUABI: "{{.*}}/usr/lib/gcc/mips64-linux-gnuabi64/4.9/../../../mips64-linux-gnuabi64{{/|\\\\}}crtn.o"
 //
 // RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=mips64el-unknown-linux-gnu \
+// RUN:     --gcc-toolchain="" \
+// RUN:     --sysroot=%S/Inputs/debian_6_mips64_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-DEBIAN-ML-MIPS64EL-GNUABI %s
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
 // RUN:     --target=mips64el-linux-gnuabi64 -mabi=n64 \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/debian_6_mips64_tree \