From 37bf71828b572d551e1a892beb2afc6db0d51b37 Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sun, 10 Jul 2016 23:24:36 +0000
Subject: [PATCH] Reapply SVN r274797.

Original Commit Message

    Driver: Stop linking to C++ when using sanitizers on Darwin

    Sanitizers on Darwin are built as dynamic libraries, not static libraries.
    Sanitizers will have their C++ dependency satisfied internally (LC_LOAD_DYLIB)
    in the libclang_rt dylib. As long as the sanitizers stay dynamic and not static,
    linking against C++ when enabling a sanitizer becomes over linkage.

    Patch by Dave Lee!

llvm-svn: 275032
---
 clang/lib/Driver/ToolChains.cpp         | 12 ------------
 clang/test/Driver/darwin-sanitizer-ld.c | 24 ++++++++++++++++--------
 2 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 89e973a12090..4ecbf2bac3c3 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -392,24 +392,12 @@ void Darwin::addProfileRTLibs(const ArgList &Args,
 void DarwinClang::AddLinkSanitizerLibArgs(const ArgList &Args,
                                           ArgStringList &CmdArgs,
                                           StringRef Sanitizer) const {
-  if (!Args.hasArg(options::OPT_dynamiclib) &&
-      !Args.hasArg(options::OPT_bundle)) {
-    // Sanitizer runtime libraries requires C++.
-    AddCXXStdlibLibArgs(Args, CmdArgs);
-  }
-
   AddLinkRuntimeLib(
       Args, CmdArgs,
       (Twine("libclang_rt.") + Sanitizer + "_" +
        getOSLibraryNameSuffix() + "_dynamic.dylib").str(),
       /*AlwaysLink*/ true, /*IsEmbedded*/ false,
       /*AddRPath*/ true);
-
-  if (GetCXXStdlibType(Args) == ToolChain::CST_Libcxx) {
-    // Add explicit dependcy on -lc++abi, as -lc++ doesn't re-export
-    // all RTTI-related symbols that UBSan uses.
-    CmdArgs.push_back("-lc++abi");
-  }
 }
 
 void DarwinClang::AddLinkRuntimeLibArgs(const ArgList &Args,
diff --git a/clang/test/Driver/darwin-sanitizer-ld.c b/clang/test/Driver/darwin-sanitizer-ld.c
index 3cf8779f510d..53c7fce115e7 100644
--- a/clang/test/Driver/darwin-sanitizer-ld.c
+++ b/clang/test/Driver/darwin-sanitizer-ld.c
@@ -5,7 +5,8 @@
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN %s
 
 // CHECK-ASAN: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN: stdc++
+// CHECK-ASAN-NOT: "-lstdc++"
+// CHECK-ASAN-NOT: "-lc++"
 // CHECK-ASAN: libclang_rt.asan_osx_dynamic.dylib"
 // CHECK-ASAN: "-rpath" "@executable_path"
 // CHECK-ASAN: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -25,7 +26,8 @@
 // RUN:   | FileCheck --check-prefix=CHECK-UBSAN %s
 
 // CHECK-UBSAN: "{{.*}}ld{{(.exe)?}}"
-// CHECK-UBSAN: stdc++
+// CHECK-UBSAN-NOT: "-lstdc++"
+// CHECK-UBSAN-NOT: "-lc++"
 // CHECK-UBSAN: libclang_rt.ubsan_osx_dynamic.dylib"
 // CHECK-UBSAN: "-rpath" "@executable_path"
 // CHECK-UBSAN: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -61,7 +63,8 @@
 // RUN:   %s -o %t.o 2>&1 | FileCheck --check-prefix=CHECK-ASAN-IOSSIM %s
 
 // CHECK-ASAN-IOSSIM: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-IOSSIM: lc++
+// CHECK-ASAN-IOSSIM-NOT: "-lstdc++"
+// CHECK-ASAN-IOSSIM-NOT: "-lc++"
 // CHECK-ASAN-IOSSIM: libclang_rt.asan_iossim_dynamic.dylib"
 // CHECK-ASAN-IOSSIM: "-rpath" "@executable_path"
 // CHECK-ASAN-IOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -72,7 +75,8 @@
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-TVOSSIM %s
 
 // CHECK-ASAN-TVOSSIM: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-TVOSSIM: lc++
+// CHECK-ASAN-TVOSSIM-NOT: "-lstdc++"
+// CHECK-ASAN-TVOSSIM-NOT: "-lc++"
 // CHECK-ASAN-TVOSSIM: libclang_rt.asan_tvossim_dynamic.dylib"
 // CHECK-ASAN-TVOSSIM: "-rpath" "@executable_path"
 // CHECK-ASAN-TVOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -83,7 +87,8 @@
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-WATCHOSSIM %s
 
 // CHECK-ASAN-WATCHOSSIM: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-WATCHOSSIM: lc++
+// CHECK-ASAN-WATCHOSSIM-NOT: "-lstdc++"
+// CHECK-ASAN-WATCHOSSIM-NOT: "-lc++"
 // CHECK-ASAN-WATCHOSSIM: libclang_rt.asan_watchossim_dynamic.dylib"
 // CHECK-ASAN-WATCHOSSIM: "-rpath" "@executable_path"
 // CHECK-ASAN-WATCHOSSIM: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -93,7 +98,8 @@
 // RUN:   %s -o %t.o 2>&1 | FileCheck --check-prefix=CHECK-ASAN-IOS %s
 
 // CHECK-ASAN-IOS: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-IOS: lc++
+// CHECK-ASAN-IOS-NOT: "-lstdc++"
+// CHECK-ASAN-IOS-NOT: "-lc++"
 // CHECK-ASAN-IOS: libclang_rt.asan_ios_dynamic.dylib"
 // CHECK-ASAN-IOS: "-rpath" "@executable_path"
 // CHECK-ASAN-IOS: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -103,7 +109,8 @@
 // RUN:   %s -o %t.o 2>&1 | FileCheck --check-prefix=CHECK-ASAN-TVOS %s
 
 // CHECK-ASAN-TVOS: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-TVOS: lc++
+// CHECK-ASAN-TVOS-NOT: "-lstdc++"
+// CHECK-ASAN-TVOS-NOT: "-lc++"
 // CHECK-ASAN-TVOS: libclang_rt.asan_tvos_dynamic.dylib"
 // CHECK-ASAN-TVOS: "-rpath" "@executable_path"
 // CHECK-ASAN-TVOS: "-rpath" "{{.*}}lib{{.*}}darwin"
@@ -113,7 +120,8 @@
 // RUN:   %s -o %t.o 2>&1 | FileCheck --check-prefix=CHECK-ASAN-WATCHOS %s
 
 // CHECK-ASAN-WATCHOS: "{{.*}}ld{{(.exe)?}}"
-// CHECK-ASAN-WATCHOS: lc++
+// CHECK-ASAN-WATCHOS-NOT: "-lstdc++"
+// CHECK-ASAN-WATCHOS-NOT: "-lc++"
 // CHECK-ASAN-WATCHOS: libclang_rt.asan_watchos_dynamic.dylib"
 // CHECK-ASAN-WATCHOS: "-rpath" "@executable_path"
 // CHECK-ASAN-WATCHOS: "-rpath" "{{.*}}lib{{.*}}darwin"