From 2bbcf669742b6b27748414e22f8042236fceef65 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Mon, 3 Aug 2009 01:28:59 +0000
Subject: [PATCH] Driver/OpenBSD: Improve ld options.  - Patch by Jonathan
 Gray!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@77935 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Driver/Tools.cpp  | 20 ++++++++++++++++++--
 test/Driver/openbsd.c |  2 +-
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 8158b72ab7..be036be135 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -1818,12 +1818,19 @@ void openbsd::Link::ConstructJob(Compilation &C, const JobAction &JA,
   const Driver &D = getToolChain().getHost().getDriver();
   ArgStringList CmdArgs;
 
+  if ((!Args.hasArg(options::OPT_nostdlib)) &&
+     (!Args.hasArg(options::OPT_shared))) {
+    CmdArgs.push_back("-e");
+    CmdArgs.push_back("__start");
+  }
+
   if (Args.hasArg(options::OPT_static)) {
     CmdArgs.push_back("-Bstatic");
   } else {
     CmdArgs.push_back("--eh-frame-hdr");
+    CmdArgs.push_back("-Bdynamic");
     if (Args.hasArg(options::OPT_shared)) {
-      CmdArgs.push_back("-Bshareable");
+      CmdArgs.push_back("-shared");
     } else {
       CmdArgs.push_back("-dynamic-linker");
       CmdArgs.push_back("/usr/libexec/ld.so");
@@ -1850,6 +1857,10 @@ void openbsd::Link::ConstructJob(Compilation &C, const JobAction &JA,
     }
   }
 
+  CmdArgs.push_back(MakeFormattedString(Args,
+                           llvm::format("-L/usr/lib/gcc-lib/%s/3.3.5",
+                           getToolChain().getTripleString().c_str())));
+
   Args.AddAllArgs(CmdArgs, options::OPT_L);
   Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
   Args.AddAllArgs(CmdArgs, options::OPT_e);
@@ -1873,10 +1884,15 @@ void openbsd::Link::ConstructJob(Compilation &C, const JobAction &JA,
 
   if (!Args.hasArg(options::OPT_nostdlib) &&
       !Args.hasArg(options::OPT_nodefaultlibs)) {
+    // FIXME: For some reason GCC passes -lgcc before adding
+    // the default system libraries. Just mimic this for now.
+    CmdArgs.push_back("-lgcc");
 
     if (Args.hasArg(options::OPT_pthread))
       CmdArgs.push_back("-pthread");
-    CmdArgs.push_back("-lc");
+    if (!Args.hasArg(options::OPT_shared))
+      CmdArgs.push_back("-lc");
+    CmdArgs.push_back("-lgcc");
   }
 
   if (!Args.hasArg(options::OPT_nostdlib) &&
diff --git a/test/Driver/openbsd.c b/test/Driver/openbsd.c
index fd0d4fa21c..afdc338f5c 100644
--- a/test/Driver/openbsd.c
+++ b/test/Driver/openbsd.c
@@ -1,6 +1,6 @@
 // RUN: clang -ccc-clang-archs "" -ccc-host-triple i686-pc-openbsd %s -### 2> %t.log &&
 // RUN: grep 'clang-cc" "-triple" "i386-pc-openbsd"' %t.log &&
 // RUN: grep 'as" "-o" ".*\.o" ".*\.s' %t.log &&
-// RUN: grep 'ld" "--eh-frame-hdr" "-dynamic-linker" ".*ld.so" "-o" "a\.out" ".*crt0.o" ".*crtbegin.o" ".*\.o" "-lc" ".*crtend.o"' %t.log &&
+// RUN: grep 'ld" "-e" "__start" "--eh-frame-hdr" "-Bdynamic" "-dynamic-linker" ".*ld.so" "-o" "a\.out" ".*crt0.o" ".*crtbegin.o" ".*\.o" "-lgcc" "-lc" "-lgcc" ".*crtend.o"' %t.log &&
 // RUN: true
 
-- 
2.40.0