diff --git a/clang/lib/Driver/ToolChains/MinGW.cpp b/clang/lib/Driver/ToolChains/MinGW.cpp
--- a/clang/lib/Driver/ToolChains/MinGW.cpp
+++ b/clang/lib/Driver/ToolChains/MinGW.cpp
@@ -200,6 +200,29 @@
   Args.AddAllArgs(CmdArgs, options::OPT_u_Group);
   Args.AddLastArg(CmdArgs, options::OPT_Z_Flag);
 
+  // Add asan flags before other libs and objects. Making asan_dynamic the first
+  // import lib allows asan to be initialized as early as possible to increase
+  // its instrumentation coverage to include other user DLLs which has not been
+  // built with asan.
+  if (Sanitize.needsAsanRt() && !Args.hasArg(options::OPT_nostdlib) &&
+      !Args.hasArg(options::OPT_nodefaultlibs)) {
+    // MinGW always links against a shared MSVCRT.
+    CmdArgs.push_back(
+        TC.getCompilerRTArgString(Args, "asan_dynamic", ToolChain::FT_Shared));
+    CmdArgs.push_back(
+        TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
+    CmdArgs.push_back("--require-defined");
+    CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
+                          ? "___asan_seh_interceptor"
+                          : "__asan_seh_interceptor");
+    // Make sure the linker consider all object files from the dynamic
+    // runtime thunk.
+    CmdArgs.push_back("--whole-archive");
+    CmdArgs.push_back(
+        TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
+    CmdArgs.push_back("--no-whole-archive");
+  }
+
   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_mdll)) {
       CmdArgs.push_back(Args.MakeArgString(TC.GetFilePath("dllcrt2.o")));
@@ -292,24 +315,6 @@
       if (Args.hasArg(options::OPT_pthread))
         CmdArgs.push_back("-lpthread");
 
-      if (Sanitize.needsAsanRt()) {
-        // MinGW always links against a shared MSVCRT.
-        CmdArgs.push_back(TC.getCompilerRTArgString(Args, "asan_dynamic",
-                                                    ToolChain::FT_Shared));
-        CmdArgs.push_back(
-            TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
-        CmdArgs.push_back("--require-defined");
-        CmdArgs.push_back(TC.getArch() == llvm::Triple::x86
-                              ? "___asan_seh_interceptor"
-                              : "__asan_seh_interceptor");
-        // Make sure the linker consider all object files from the dynamic
-        // runtime thunk.
-        CmdArgs.push_back("--whole-archive");
-        CmdArgs.push_back(
-            TC.getCompilerRTArgString(Args, "asan_dynamic_runtime_thunk"));
-        CmdArgs.push_back("--no-whole-archive");
-      }
-
       TC.addProfileRTLibs(Args, CmdArgs);
 
       if (!HasWindowsApp) {
diff --git a/clang/test/Driver/mingw-sanitizers.c b/clang/test/Driver/mingw-sanitizers.c
--- a/clang/test/Driver/mingw-sanitizers.c
+++ b/clang/test/Driver/mingw-sanitizers.c
@@ -1,13 +1,18 @@
-// RUN: %clang -target i686-windows-gnu %s -### -fsanitize=address 2>&1 | FileCheck --check-prefix=ASAN-I686 %s
-// ASAN-I686: "{{.*}}libclang_rt.asan_dynamic-i386.dll.a"
-// ASAN-I686: "{{[^"]*}}libclang_rt.asan_dynamic_runtime_thunk-i386.a"
-// ASAN-I686: "--require-defined" "___asan_seh_interceptor"
-// ASAN-I686: "--whole-archive" "{{.*}}libclang_rt.asan_dynamic_runtime_thunk-i386.a" "--no-whole-archive"
-
-// RUN: %clang -target x86_64-windows-gnu %s -### -fsanitize=address 2>&1 | FileCheck --check-prefix=ASAN-X86_64 %s
-// ASAN-X86_64: "{{.*}}libclang_rt.asan_dynamic-x86_64.dll.a"
+// RUN: echo -n > %t.a
+// RUN: %clang -target i686-windows-gnu %s -### -fsanitize=address -lcomponent %t.a 2>&1 | FileCheck --check-prefixes=ASAN-ALL,ASAN-I686 -DINPUT=%t.a %s
+// RUN: %clang -target x86_64-windows-gnu %s -### -fsanitize=address -lcomponent %t.a 2>&1 | FileCheck --check-prefixes=ASAN-ALL,ASAN-X86_64 -DINPUT=%t.a %s
+//
+// ASAN-ALL-NOT:"-l{{[^"]+"]}}"
+// ASAN-ALL-NOT:"[[INPUT]]"
+// ASAN-I686:   "{{[^"]*}}libclang_rt.asan_dynamic-i386.dll.a"
+// ASAN-I686:   "{{[^"]*}}libclang_rt.asan_dynamic_runtime_thunk-i386.a"
+// ASAN-I686:   "--require-defined" "___asan_seh_interceptor"
+// ASAN-I686:   "--whole-archive" "{{[^"]*}}libclang_rt.asan_dynamic_runtime_thunk-i386.a" "--no-whole-archive"
+// ASAN-X86_64: "{{[^"]*}}libclang_rt.asan_dynamic-x86_64.dll.a"
 // ASAN-X86_64: "{{[^"]*}}libclang_rt.asan_dynamic_runtime_thunk-x86_64.a"
 // ASAN-X86_64: "--require-defined" "__asan_seh_interceptor"
-// ASAN-X86_64: "--whole-archive" "{{.*}}libclang_rt.asan_dynamic_runtime_thunk-x86_64.a" "--no-whole-archive"
+// ASAN-X86_64: "--whole-archive" "{{[^"]*}}libclang_rt.asan_dynamic_runtime_thunk-x86_64.a" "--no-whole-archive"
+// ASAN-ALL:    "-lcomponent"
+// ASAN-ALL:    "[[INPUT]]"
 
 // RUN: %clang -target x86_64-windows-gnu %s -### -fsanitize=vptr