[clang] Don't pass sanitizers' rtlibs to linker with -r

If clang is invoked with `-r` (relocatable linking)
then we shouldn't construct sanitizer arguments and
then pass sanitizer runtime libs to the linker
GCC also skips runtime linking if `-r` is also here

Author: chestnykh

clang/lib/Driver/SanitizerArgs.cpp

@@ -1159,7 +1159,8 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
 
   LinkRuntimes =
       Args.hasFlag(options::OPT_fsanitize_link_runtime,
-                   options::OPT_fno_sanitize_link_runtime, LinkRuntimes);
+                   options::OPT_fno_sanitize_link_runtime, LinkRuntimes) &&
+      !Args.hasArg(options::OPT_r);
 
   // Parse -link-cxx-sanitizer flag.
   LinkCXXRuntimes = D.CCCIsCXX();

clang/test/Driver/sanitizer-ld.c

@@ -1369,3 +1369,19 @@
 // CHECK-DSO-SHARED-HWASAN-AARCH64-LINUX-NOT: "-lresolv"
 // CHECK-DSO-SHARED-HWASAN-AARCH64-LINUX-NOT: "--export-dynamic"
 // CHECK-DSO-SHARED-HWASAN-AARCH64-LINUX-NOT: "--dynamic-list"
+
+// RUN: %clang -fsanitize=address,undefined -r -### %s 2>&1 \
+// RUN:     --target=x86_64-unknown-linux -fuse-ld=ld \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | %{filecheck} --check-prefix=CHECK-RELOCATABLE-LINK-ASAN-UBSAN-RTLIB
+//
+// CHECK-RELOCATABLE-LINK-ASAN-UBSAN-RTLIB-NOT: "{{.*}}(asan|ubsan){{.*}}"
+
+// RUN: %clang -fsanitize=thread -r -### %s 2>&1 \
+// RUN:     --target=x86_64-unknown-linux -fuse-ld=ld \
+// RUN:     -resource-dir=%S/Inputs/resource_dir \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | %{filecheck} --check-prefix=CHECK-RELOCATABLE-LINK-TSAN-RTLIB
+//
+// CHECK-RELOCATABLE-LINK-TSAN-RTLIB-NOT: "{{.*}}tsan{{.*}}"