From: Yaron Keren <yaron.keren@gmail.com>
Date: Sun, 9 Aug 2015 00:24:07 +0000 (+0000)
Subject: Teach mingw toolchain driver to properly emit static or dynamic linking of ligcc.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=14d62ae679aa7b2fa5981741e217f0c31c2cd647;p=clang

Teach mingw toolchain driver to properly emit static or dynamic linking of ligcc.
Implemented in MinGW::Linker::AddLibGCC since AddLibgcc is a logic puzzle even
before adding one more boolean. A first step towards simplification of AddLibgcc
would be to factor out the Android AddLibgcc code into its own routine.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@244407 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index f23765b8c8..b82b5f0a07 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -9083,8 +9083,24 @@ void MinGW::Linker::AddLibGCC(const ArgList &Args,
     CmdArgs.push_back("-lmingwthrd");
   CmdArgs.push_back("-lmingw32");
 
-  // Add libgcc or compiler-rt.
-  AddRunTimeLibs(getToolChain(), getToolChain().getDriver(), CmdArgs, Args);
+  // Make use of compiler-rt if --rtlib option is used
+  ToolChain::RuntimeLibType RLT = getToolChain().GetRuntimeLibType(Args);
+  if (RLT == ToolChain::RLT_Libgcc) {
+    bool Static = Args.hasArg(options::OPT_static_libgcc) ||
+                  Args.hasArg(options::OPT_static);
+    bool Shared = Args.hasArg(options::OPT_shared);
+    bool CXX = getToolChain().getDriver().CCCIsCXX();
+
+    if (Static || (!CXX && !Shared)) {
+      CmdArgs.push_back("-lgcc");
+      CmdArgs.push_back("-lgcc_eh");
+    } else {
+      CmdArgs.push_back("-lgcc_s");
+      CmdArgs.push_back("-lgcc");
+    }
+  } else {
+    AddRunTimeLibs(getToolChain(), getToolChain().getDriver(), CmdArgs, Args);
+  }
 
   CmdArgs.push_back("-lmoldname");
   CmdArgs.push_back("-lmingwex");
diff --git a/test/Driver/mingw-libgcc.c b/test/Driver/mingw-libgcc.c
new file mode 100644
index 0000000000..c427eba9c0
--- /dev/null
+++ b/test/Driver/mingw-libgcc.c
@@ -0,0 +1,25 @@
+// Test if mingw toolchain driver emits static linking (-lgcc -lgcc_eh) or dynamic linking (-lgcc_s -lgcc).
+// Verified with gcc version 5.1.0 (i686-posix-dwarf-rev0, Built by MinGW-W64 project).
+
+// gcc, static
+// RUN: %clang -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static-libgcc -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static -shared -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static-libgcc -shared -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+
+// gcc, dynamic
+// RUN: %clang -shared -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_DYNAMIC %s
+
+// g++, static
+// RUN: %clang -static --driver-mode=g++ -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static-libgcc --driver-mode=g++ -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static -shared --driver-mode=g++ -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+// RUN: %clang -static-libgcc -shared --driver-mode=g++ -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_STATIC %s
+
+// g++, dynamic
+// RUN: %clang --driver-mode=g++ -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_DYNAMIC %s
+// RUN: %clang -shared --driver-mode=g++ -v -target i686-pc-windows-gnu -### %s 2>&1 | FileCheck -check-prefix=CHECK_DYNAMIC %s
+
+// CHECK_STATIC: "-lgcc" "-lgcc_eh"
+// CHECK_DYNAMIC: "-lgcc_s" "-lgcc"