From 1689d3f732a410dd6a09961f0e8a9fbe0d62c4ac Mon Sep 17 00:00:00 2001
From: Joerg Sonnenberger <joerg@bec.de>
Date: Wed, 28 Jan 2015 23:30:39 +0000
Subject: [PATCH] For the --be8 flag, check explicitly for pre-v7 / pre-v6m
 cores. Those used the old Big Endian support on ARM and don't need flags.
 Refactor the logic in a separate common function, which also looks at -march.
 Add corresponding logic for the Linux toolchain.

llvm-svn: 227393
---
 clang/lib/Driver/Tools.cpp   | 21 +++++++++++++++++++--
 clang/lib/Driver/Tools.h     |  2 ++
 clang/test/Driver/linux-ld.c | 18 ++++++++++++++++++
 clang/test/Driver/netbsd.c   | 11 ++++++++++-
 4 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/clang/lib/Driver/Tools.cpp b/clang/lib/Driver/Tools.cpp
index 27ebc8ae5732..a2b494de74c3 100644
--- a/clang/lib/Driver/Tools.cpp
+++ b/clang/lib/Driver/Tools.cpp
@@ -5445,6 +5445,20 @@ const char *arm::getLLVMArchSuffixForARM(StringRef CPU) {
     .Default("");
 }
 
+void arm::appendEBLinkFlags(const ArgList &Args, ArgStringList &CmdArgs, const llvm::Triple &Triple) {
+  if (Args.hasArg(options::OPT_r))
+    return;
+
+  StringRef Suffix = getLLVMArchSuffixForARM(getARMCPUForMArch(Args, Triple));
+  const char *LinkFlag = llvm::StringSwitch<const char *>(Suffix)
+    .Cases("v4", "v4t", "v5", "v5e", nullptr)
+    .Cases("v6", "v6t2", nullptr)
+    .Default("--be8");
+
+  if (LinkFlag)
+    CmdArgs.push_back(LinkFlag);
+}
+
 bool mips::hasMipsAbiArg(const ArgList &Args, const char *Value) {
   Arg *A = Args.getLastArg(options::OPT_mabi_EQ);
   return A && (A->getValue() == StringRef(Value));
@@ -6908,8 +6922,7 @@ void netbsd::Link::ConstructJob(Compilation &C, const JobAction &JA,
     break;
   case llvm::Triple::armeb:
   case llvm::Triple::thumbeb:
-    if (!Args.hasArg(options::OPT_r))
-      CmdArgs.push_back("--be8");
+    arm::appendEBLinkFlags(Args, CmdArgs, getToolChain().getTriple());
     CmdArgs.push_back("-m");
     switch (getToolChain().getTriple().getEnvironment()) {
     case llvm::Triple::EABI:
@@ -7460,6 +7473,10 @@ void gnutools::Link::ConstructJob(Compilation &C, const JobAction &JA,
   if (Args.hasArg(options::OPT_s))
     CmdArgs.push_back("-s");
 
+  if (ToolChain.getArch() == llvm::Triple::armeb ||
+      ToolChain.getArch() == llvm::Triple::thumbeb)
+    arm::appendEBLinkFlags(Args, CmdArgs, getToolChain().getTriple());
+
   for (const auto &Opt : ToolChain.ExtraOpts)
     CmdArgs.push_back(Opt.c_str());
 
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index 6647f39ce817..5aea8258d251 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -228,6 +228,8 @@ namespace arm {
   const char* getARMCPUForMArch(const llvm::opt::ArgList &Args,
                                 const llvm::Triple &Triple);
   const char* getLLVMArchSuffixForARM(StringRef CPU);
+
+  void appendEBLinkFlags(const llvm::opt::ArgList &Args, ArgStringList &CmdArgs, const llvm::Triple &Triple);
 }
 
 namespace mips {
diff --git a/clang/test/Driver/linux-ld.c b/clang/test/Driver/linux-ld.c
index bde682976e81..b431b1c7489c 100644
--- a/clang/test/Driver/linux-ld.c
+++ b/clang/test/Driver/linux-ld.c
@@ -1412,3 +1412,21 @@
 // RUN:        --sysroot=%S/Inputs/basic_linux_tree 2>& 1 \
 // RUN:   | FileCheck --check-prefix=CHECK-u %s
 // CHECK-u: "-u" "asdf"
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=armeb-unknown-linux \
+// RUN:     --gcc-toolchain="" \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-ARMEB %s
+// CHECK-ARMEB: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
+// CHECK-ARMEB-NOT: "--be8"
+// CHECK-ARMEB: "-m" "armebelf_linux_eabi"
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     --target=armebv7-unknown-linux \
+// RUN:     --gcc-toolchain="" \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-ARMV7EB %s
+// CHECK-ARMV7EB: "{{.*}}ld{{(.exe)?}}" "--sysroot=[[SYSROOT:[^"]+]]"
+// CHECK-ARMV7EB: "--be8"
+// CHECK-ARMV7EB: "-m" "armebelf_linux_eabi"
diff --git a/clang/test/Driver/netbsd.c b/clang/test/Driver/netbsd.c
index 26d6483c057f..612935d9819e 100644
--- a/clang/test/Driver/netbsd.c
+++ b/clang/test/Driver/netbsd.c
@@ -19,6 +19,12 @@
 // RUN: %clang -no-canonical-prefixes -target armeb--netbsd-eabi \
 // RUN: -no-integrated-as --sysroot=%S/Inputs/basic_netbsd_tree %s -### 2>&1 \
 // RUN: | FileCheck -check-prefix=ARMEB %s
+// RUN: %clang -no-canonical-prefixes -target armeb--netbsd-eabi -march=armv7 \
+// RUN: -no-integrated-as --sysroot=%S/Inputs/basic_netbsd_tree %s -### 2>&1 \
+// RUN: | FileCheck -check-prefix=ARMV7EB %s
+// RUN: %clang -no-canonical-prefixes -target armv7eb--netbsd-eabi \
+// RUN: -no-integrated-as --sysroot=%S/Inputs/basic_netbsd_tree %s -### 2>&1 \
+// RUN: | FileCheck -check-prefix=ARMV7EB %s
 // RUN: %clang -r -no-canonical-prefixes -target armeb--netbsd-eabi \
 // RUN: -no-integrated-as --sysroot=%S/Inputs/basic_netbsd_tree %s -### 2>&1 \
 // RUN: | FileCheck -check-prefix=ARMEB-R %s
@@ -135,11 +141,14 @@
 // ARMEB: clang{{.*}}" "-cc1" "-triple" "armebv5e--netbsd-eabi"
 // ARMEB: as{{.*}}" "-mcpu=arm926ej-s" "-o"
 // ARMEB: ld{{.*}}" "--eh-frame-hdr" "-dynamic-linker" "/libexec/ld.elf_so"
-// ARMEB: "--be8" "-m" "armelfb_nbsd_eabi"
+// ARMEB-NOT: "--be8"
+// ARMEB: "-m" "armelfb_nbsd_eabi"
 // ARMEB: "-o" "a.out" "{{.*}}/usr/lib{{/|\\\\}}crt0.o"
 // ARMEB: "{{.*}}/usr/lib{{/|\\\\}}eabi{{/|\\\\}}crti.o"
 // ARMEB: "{{.*}}/usr/lib{{/|\\\\}}crtbegin.o" "{{.*}}.o" "-lc"
 // ARMEB: "{{.*}}/usr/lib{{/|\\\\}}crtend.o" "{{.*}}/usr/lib{{/|\\\\}}crtn.o"
+// ARMV7EB: ld{{.*}}" "--eh-frame-hdr" "-dynamic-linker" "/libexec/ld.elf_so"
+// ARMV7EB: "--be8" "-m" "armelfb_nbsd_eabi"
 
 // ARMEB-R: ld{{.*}}"
 // ARMEB-R-NOT: "--be8"