Reapply "[driver] Fix sanitizer libc++ runtime linking (llvm#120370)" (llvm#120538)

Reland without item 2 from llvm#120370 to avoid breaking libc++ tests.

This reverts commit 60a2f32.

Author: vitalybuka

clang/lib/Driver/SanitizerArgs.cpp

@@ -1106,10 +1106,10 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
                    options::OPT_fno_sanitize_link_runtime, LinkRuntimes);
 
   // Parse -link-cxx-sanitizer flag.
-  LinkCXXRuntimes = Args.hasArg(options::OPT_fsanitize_link_cxx_runtime,
-                                options::OPT_fno_sanitize_link_cxx_runtime,
-                                LinkCXXRuntimes) ||
-                    D.CCCIsCXX();
+  LinkCXXRuntimes = D.CCCIsCXX();
+  LinkCXXRuntimes =
+      Args.hasFlag(options::OPT_fsanitize_link_cxx_runtime,
+                   options::OPT_fno_sanitize_link_cxx_runtime, LinkCXXRuntimes);
 
   NeedsMemProfRt = Args.hasFlag(options::OPT_fmemory_profile,
                                 options::OPT_fmemory_profile_EQ,

clang/test/Driver/sanitizer-ld.c

@@ -132,18 +132,78 @@
 // RUN:     -resource-dir=%S/Inputs/empty_resource_dir \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
 // RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-CXX %s
-//
+
+// RUN: %clangxx -### %s 2>&1 \
+// RUN:     --target=i386-unknown-linux -fuse-ld=ld -stdlib=platform -fsanitize=address \
+// RUN:     -resource-dir=%S/Inputs/empty_resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:     -fsanitize-link-c++-runtime \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-CXX %s
+
 // CHECK-ASAN-LINUX-CXX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
-// CHECK-ASAN-LINUX-CXX-NOT: "-lc"
-// CHECK-ASAN-LINUX-CXX: "--whole-archive" "{{.*}}libclang_rt.asan.a" "--no-whole-archive"
-// CHECK-ASAN-LINUX-CXX: "--whole-archive" "{{.*}}libclang_rt.asan_cxx.a" "--no-whole-archive"
+// CHECK-ASAN-LINUX-CXX-SAME: "--whole-archive" "{{.*}}libclang_rt.asan.a" "--no-whole-archive"
+// CHECK-ASAN-LINUX-CXX-SAME: "--whole-archive" "{{.*}}libclang_rt.asan_cxx.a" "--no-whole-archive"
 // CHECK-ASAN-LINUX-CXX-NOT: "--dynamic-list"
-// CHECK-ASAN-LINUX-CXX: "--export-dynamic"
-// CHECK-ASAN-LINUX-CXX: stdc++
-// CHECK-ASAN-LINUX-CXX: "-lpthread"
-// CHECK-ASAN-LINUX-CXX: "-lrt"
-// CHECK-ASAN-LINUX-CXX: "-ldl"
-// CHECK-ASAN-LINUX-CXX: "-lresolv"
+// CHECK-ASAN-LINUX-CXX-SAME: "--export-dynamic"
+// CHECK-ASAN-LINUX-CXX-SAME: "-lstdc++"
+// CHECK-ASAN-LINUX-CXX-SAME: "-lpthread"
+// CHECK-ASAN-LINUX-CXX-SAME: "-lrt"
+// CHECK-ASAN-LINUX-CXX-SAME: "-ldl"
+// CHECK-ASAN-LINUX-CXX-SAME: "-lresolv"
+// CHECK-ASAN-LINUX-CXX-SAME: "-lc"
+
+// RUN: %clang -### %s 2>&1 \
+// RUN:     --target=i386-unknown-linux -fuse-ld=ld -stdlib=platform -fsanitize=address \
+// RUN:     -resource-dir=%S/Inputs/empty_resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:     -fno-sanitize-link-c++-runtime \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-CNOCXX %s
+
+// CHECK-ASAN-LINUX-CNOCXX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "--whole-archive" "{{.*}}libclang_rt.asan.a" "--no-whole-archive"
+// CHECK-ASAN-LINUX-CNOCXX-NOT: libclang_rt.asan_cxx
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "--export-dynamic"
+// CHECK-ASAN-LINUX-CNOCXX-NOT: stdc++
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "-lpthread"
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "-lrt"
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "-ldl"
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "-lresolv"
+// CHECK-ASAN-LINUX-CNOCXX-SAME: "-lc"
+
+// RUN: %clangxx -### %s 2>&1 \
+// RUN:     --target=i386-unknown-linux -fuse-ld=ld -stdlib=platform -fsanitize=address \
+// RUN:     -resource-dir=%S/Inputs/empty_resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:     -fno-sanitize-link-c++-runtime \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-NOCXX %s
+
+// CHECK-ASAN-LINUX-NOCXX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "--whole-archive" "{{.*}}libclang_rt.asan.a" "--no-whole-archive"
+// CHECK-ASAN-LINUX-NOCXX-NOT: libclang_rt.asan_cxx
+// CHECK-ASAN-LINUX-NOCXX-SAME: "--export-dynamic"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "-lstdc++"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "-lpthread"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "-lrt"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "-ldl"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "-lresolv"
+// CHECK-ASAN-LINUX-NOCXX-SAME: "-lc"
+
+// RUN: %clangxx -### %s 2>&1 \
+// RUN:     --target=i386-unknown-linux -fuse-ld=ld -stdlib=platform -fsanitize=address \
+// RUN:     -resource-dir=%S/Inputs/empty_resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:     -nostdlib++ \
+// RUN:   | FileCheck --check-prefix=CHECK-ASAN-LINUX-NOSTDCXX %s
+
+// CHECK-ASAN-LINUX-NOSTDCXX: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "--whole-archive" "{{.*}}libclang_rt.asan.a" "--no-whole-archive"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: libclang_rt.asan_cxx
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "--export-dynamic"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "-lpthread"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "-lrt"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "-ldl"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "-lresolv"
+// CHECK-ASAN-LINUX-NOSTDCXX-SAME: "-lc"
 
 // RUN: %clang -### %s -o /dev/null -fsanitize=address \
 // RUN:     --target=i386-unknown-linux -fuse-ld=ld -stdlib=platform \