From b00075c31f588781f9e8c3986af7927e56c7620c Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sun, 7 Feb 2016 06:03:38 +0000
Subject: [PATCH] Driver: adjust linker invocation for GNUTools

Adjust the driver to invoke the linker more similar to gcc.  -dynamic-linker is
only passed if -static and -shared are not part of the compiler (driver)
invocation.  Replicate the passing of -export-rdynamic as per the GCC link spec:

  %{!static: %{rdynamic:-export-dynamic} %{!shared:-dynamic-linker ...}}

This behaviour is consistent across all the targets that are supported, so no
need to conditionalise it on the target.

Resolves PR24245.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@260019 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Driver/Tools.cpp         | 17 ++++++++++-------
 test/Driver/dynamic-linker.c | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 7 deletions(-)
 create mode 100644 test/Driver/dynamic-linker.c

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index b16c672250..eb0b78a580 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -8900,13 +8900,16 @@ void gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-shared");
   }
 
-  if (Arch == llvm::Triple::arm || Arch == llvm::Triple::armeb ||
-      Arch == llvm::Triple::thumb || Arch == llvm::Triple::thumbeb ||
-      (!Args.hasArg(options::OPT_static) &&
-       !Args.hasArg(options::OPT_shared))) {
-    CmdArgs.push_back("-dynamic-linker");
-    CmdArgs.push_back(Args.MakeArgString(
-        D.DyldPrefix + getLinuxDynamicLinker(Args, ToolChain)));
+  if (!Args.hasArg(options::OPT_static)) {
+    if (Args.hasArg(options::OPT_rdynamic))
+      CmdArgs.push_back("-export-dynamic");
+
+    if (!Args.hasArg(options::OPT_shared)) {
+      const std::string Loader =
+          D.DyldPrefix + getLinuxDynamicLinker(Args, ToolChain);
+      CmdArgs.push_back("-dynamic-linker");
+      CmdArgs.push_back(Args.MakeArgString(Loader));
+    }
   }
 
   CmdArgs.push_back("-o");
diff --git a/test/Driver/dynamic-linker.c b/test/Driver/dynamic-linker.c
new file mode 100644
index 0000000000..c7579f4af1
--- /dev/null
+++ b/test/Driver/dynamic-linker.c
@@ -0,0 +1,32 @@
+// RUN: %clang -target armv7-unknown-linux-gnueabi -### /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-DYNAMIC-LINKER %s
+// RUN: %clang -target i386-unknown-linux-gnu -### /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-DYNAMIC-LINKER %s
+// RUN: %clang -target mips64-unknown-linux-gnu -### /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-DYNAMIC-LINKER %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu -### /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-DYNAMIC-LINKER %s
+// RUN: %clang -target x86_64-unknown-linux-gnu -### /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-DYNAMIC-LINKER %s
+
+// RUN: %clang -target armv7-unknown-linux-gnueabi -### -shared /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED %s
+// RUN: %clang -target i386-unknown-linux-gnu -### -shared /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED %s
+// RUN: %clang -target mips64-unknown-linux-gnu -### -shared /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu -### -shared /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED %s
+// RUN: %clang -target x86_64-unknown-linux-gnu -### -shared /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED %s
+
+
+// RUN: %clang -target armv7-unknown-linux-gnueabi -### -shared -rdynamic /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED -check-prefix CHECK-RDYNAMIC %s
+// RUN: %clang -target i386-unknown-linux-gnu -### -shared -rdynamic /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED -check-prefix CHECK-RDYNAMIC %s
+// RUN: %clang -target mips64-unknown-linux-gnu -### -shared -rdynamic /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED -check-prefix CHECK-RDYNAMIC %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu -### -shared -rdynamic /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED -check-prefix CHECK-RDYNAMIC %s
+// RUN: %clang -target x86_64-unknown-linux-gnu -### -shared -rdynamic /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHARED -check-prefix CHECK-RDYNAMIC %s
+
+// RUN: %clang -target armv7-unknown-linux-gnueabi -### -static /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-STATIC %s
+// RUN: %clang -target i386-unknown-linux-gnu -### -static /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-STATIC %s
+// RUN: %clang -target mips64-unknown-linux-gnu -### -static /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-STATIC %s
+// RUN: %clang -target powerpc64-unknown-linux-gnu -### -static /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-STATIC %s
+// RUN: %clang -target x86_64-unknown-linux-gnu -### -static /dev/null -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-STATIC %s
+
+// CHECK-RDYNAMIC: "-export-dynamic"
+// CHECK-SHARED: "-shared"
+// CHECK-STATIC: "-{{B?}}static"
+// CHECK-DYNAMIC-LINKER: "-dynamic-linker"
+// CHECK-SHARED-NOT: "-dynamic-linker"
+// CHECK-STATIC-NOT: "-dynamic-linker"
+
-- 
2.40.0